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  • PANGAEA  (34,309)
  • American Chemical Society  (1,750)
  • American Geophysical Union
  • Nature Publishing Group (NPG)
  • 2020-2024  (36,317)
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  • 1
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    Skillful long-lead prediction of summertime heavy rainfall in the US Midwest from sea surface salinity (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-07
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49(13), (2022): e2022GL098554, https://doi.org/10.1029/2022GL098554.
    Description: Summertime heavy rainfall and its resultant floods are among the most harmful natural hazards in the US Midwest, one of the world's primary crop production areas. However, seasonal forecasts of heavy rain, currently based on preseason sea surface temperature anomalies (SSTAs), remain unsatisfactory. Here, we present evidence that sea surface salinity anomalies (SSSAs) over the tropical western Pacific and subtropical North Atlantic are skillful predictors of summer time heavy rainfall one season ahead. A one standard deviation change in tropical western Pacific SSSA is associated with a 1.8 mm day−1 increase in local precipitation, which excites a teleconnection pattern to extratropical North Pacific. Via extratropical air-sea interaction and long memory of midlatitude SSTA, a wave train favorable for US Midwest heavy rain is induced. Combined with soil moisture feedbacks bridging the springtime North Atlantic salinity, the SSSA-based statistical prediction model improves Midwest heavy rainfall forecasts by 92%, complementing existing SSTA-based frameworks.
    Description: This study is supported by the NSF PREEVENTS program under ICER-1663138 (LL) and ICER-1663704 (RWS and CCU).
    Description: 2023-01-07
    Keywords: Sea surface salinity ; Midwest precipitation ; Heavy rainfall ; Long-lead prediction
    Repository Name: Woods Hole Open Access Server
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  • 2
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    Contributions of different sea-level processes to high-tide flooding along the US coastline (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-14
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(7), (2022): e2021JC018276, https://doi.org/10.1029/2021JC018276.
    Description: Coastal communities across the United States (U.S.) are experiencing an increase in the frequency of high-tide flooding (HTF). This increase is mainly due to sea-level rise (SLR), but other factors such as intra- to inter-annual mean sea level variability, tidal anomalies, and non-tidal residuals also contribute to HTF events. Here we introduce a novel decomposition approach to develop and then analyze a new database of different sea-level components. Those components represent processes that act on various timescales to contribute to HTF along the U.S. coastline. We find that the relative importance of components to HTF events strongly varies in space and time. Tidal anomalies contribute the most along the west and northeast coasts, where HTF events mostly occur in winter. Non-tidal residuals are most important along the Gulf of Mexico and mid-Atlantic coasts, where HTF events mostly occur in fall. We also quantify the minimum number of components that were required to cause HTF events in the past and how this number changed over time. The results highlight that at present, due to SLR, fewer components are needed to combine to push water levels above HTF thresholds, but tidal anomalies alone are still not sufficient to reach HTF thresholds in most locations. Finally, we explore how co-variability between different components leads to compounding effects. In some places, positive correlation between sea-level components leads to significantly more HTF events than would be expected if sea-level components were uncorrelated, whereas in other places negative correlation leads to fewer HTF events.
    Description: his work was supported by NASA's Sea Level Change Team award number 80NSSC20K1241. S.L. also acknowledges support by the China Scholarship Council (no. 201904910413) and the Ministry of Science and Technology of the People's Republic of China (grant no. 2011YQ120045).
    Description: 2023-01-14
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  • 3
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    Alkali Metal- and Acid-Catalyzed Interconversion of Goniodomin A with Congeners B and C (2021)
    American Chemical Society
    In:  EPIC3Journal of Natural Products, American Chemical Society, 84(9), pp. 2554-2567, ISSN: 0163-3864
    Details
    Publication Date: 2023-03-13
    Description: Goniodomin A (GDA, 1) is a phycotoxin produced by at least four species of Alexandrium dinoflagellates that are found globally in brackish estuaries and lagoons. It is a linear polyketide with six oxygen heterocyclic rings that is cyclized into a macrocyclic structure via lactone formation. Two of the oxygen heterocycles in 1 comprise a spiro-bis-pyran, whereas goniodomin B (GDB) contains a 2,7-dioxabicyclo[3.3.1]nonane ring system fused to a pyran. When H2O is present, 1 undergoes facile conversion to isomer GDB and to an α,β-unsaturated ketone, goniodomin C (GDC, 7). GDB and GDC can be formed from GDA by cleavage of the spiro-bis-pyran ring system. GDA, but not GDB or GDC, forms a crown ether-type complex with K+. Equilibration of GDA with GDB and GDC is observed in the presence of H+ and of Na+, but the equilibrated mixtures revert to GDA upon addition of K+. Structural differences have been found between the K+ and Na+ complexes. The association of GDA with K+ is strong, while that with Na+ is weak. The K+ complex has a compact, well-defined structure, whereas Na+ complexes are an ill-defined mixture of species. Analyses of in vitro A. monilatum and A. hiranoi cultures indicate that only GDA is present in the cells; GDB and GDC appear to be postharvest transformation products.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Seismic imaging of Dante’s Domes oceanic core complex from streamer waveform inversion and reverse time migration (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-25
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 127(8), (2022): e2021JB023814, https://doi.org/10.1029/2021jb023814.
    Description: Early arrival traveltime tomography and full waveform inversion were conducted on downward continued streamer seismic data at Dante's Domes oceanic core complex (OCC), providing unprecedented details of shallow P wave velocity structure. Together with reverse time migration images, seafloor morphology, in situ geological samples, magnetic and gravity data, the seismic constraints are used to infer the lithological distribution along the seismic profiles. Based on the striking similarity in velocity structure beneath the corrugated domes with other OCCs and drilling results from Atlantis Massif, we confidently reconfirmed the Southern Dome as dominantly gabbroic rocks, and the Northern Dome as serpentinized peridotites. A series of isolated gabbroic bodies embedded in the diabase and basaltic layers is observed in the breakaway zone, suggesting that the initiation of Dante's Domes OCC occurred over a long period during which there were several failed attempts to form a long-lived detachment fault. This early development of the OCC probably occurred under a regime of alternating magma starvation and magma replenishment. The predominantly gabbroic section, beneath the Southern Dome and extending to termination, indicates the OCC has been created with relatively high magma flux. We also imaged distinct shallow subseafloor reflections which are also termed as D reflectors underneath the corrugated domes. The location of the D reflectors is similar to those in the Atlantis Massif, with depths well correlated with the top of exhumed gabbroic bodies and the discontinuities in the D reflectors between gabbroic bodies. Our findings contribute to the understanding of processes controlling the OCCs initiation and evolution at slow spreading ridges.
    Description: This research was supported by the National Natural Science Foundation of China (91858207), Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (GML2019ZD0205), and Guangdong Basic and Applied Basic Research Foundation (2021B1515020023). M. X. acknowledges support from Special Foundation for National Science and Technology Basic Research Program of China (2018FY100505), Guangdong NSF research team project (2017A030312002), K. C. Wong Education Foundation (GJTD-2018-13), and the Chinese Academy of Sciences (Y4SL021001, QYZDY-SSWDQC005, 133244KYSB20180029, 131551KYSB20200021, and ISEE2021PY03). J. P. C. acknowledges support from the Independent Research and Development Program at WHOI.
    Repository Name: Woods Hole Open Access Server
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  • 5
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    Spatial variability of movement, structure, and formation of Warm Core Rings in the Northwest Atlantic Slope Sea (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-25
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 127(8),(2022): e2022JC018737, https://doi.org/10.1029/2022jc018737.
    Description: Gulf Stream Warm Core Rings (WCRs) have important influences on the New England Shelf and marine ecosystems. A 10-year (2011–2020) WCR dataset that tracks weekly WCR locations and surface areas is used here to identify the rings' path and characterize their movement between 55 and 75°W. The WCR dataset reveals a very narrow band between 66 and 71°W along which rings travel almost due west along ∼39°N across isobaths – the “Ring Corridor.” Then, west of the corridor, the mean path turns southwestward, paralleling the shelfbreak. The average ring translation speed along the mean path is 5.9 cm s−1. Long-lived rings (lifespan 〉150 days) tend to occupy the region west of the New England Seamount Chain (NESC) whereas short-lived rings (lifespan 〈150 days) tend to be more broadly distributed. WCR vertical structures, analyzed using available Argo float profiles indicate that rings that are formed to the west of the NESC have shallower thermoclines than those formed to the east. This tendency may be due to different WCR formation processes that are observed to occur along different sections of the Gulf Stream. WCRs formed to the east of the NESC tend to form from a pinch-off mechanism incorporating cores of Sargasso Sea water and a perimeter of Gulf Stream water. WCRs that form to the west of the NESC, form from a process called an aneurysm. WCRs formed through aneurysms comprise water mostly from the northern half of the Gulf Stream and are smaller than the classic pinch-off rings.
    Description: AS and AG are grateful for financial support from NOAA (NA11NOS0120038), NSF (OCE-1851242 and OCE-2123283), SMAST, and UMass Dartmouth. GG was supported by NSF under grant OCE-1657853. MA was supported by NSF under grant OCE-2122726 and by ONR under grant N00014-22-1-2112.
    Keywords: Gulf Stream ; Warm core rings ; Trajectories ; Eddies ; Aneurysm ; Ring formation
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  • 6
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    Eruption rates, tempo, and stratigraphy of Paleocene flood basalts on Baffin Island, Canada (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-25
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biasi, J., Asimow, P., Horton, F., & Boyes, X. Eruption rates, tempo, and stratigraphy of Paleocene flood basalts on Baffin Island, Canada. Geochemistry, Geophysics, Geosystems, 23(9), (2022): e2021GC010172, https://doi.org/10.1029/2021gc010172.
    Description: High-temperature melting in mantle plumes produces voluminous eruptions that are often temporally coincident with mass extinctions. Paleocene Baffin Island lavas—products of early Iceland mantle plume activity—are exceptionally well characterized geochemically but have poorly constrained stratigraphy, geochronology, and eruptive tempos. To provide better geologic context, we measured seven stratigraphic sections of the volcanic deposits and collected paleomagnetic data from 38 sites in the lavas and underlying Cretaceous sediments (Quqaluit Fm.). The average paleomagnetic pole from this study does not overlap with the expected pole for a stable North American locality at 60 Ma, yet the data have sufficient dispersion to average out secular variation. After ruling out other possibilities, we find that the picrites were probably erupted during a polarity transition, over less than 5 kyr. If so, the average eruption interval was ∼67 years per flow for the thickest sequence of exposed lavas. We also calculate that the flood basalts had a minimum total volume of ∼176 km3 (excluding submerged lavas in Baffin Bay). This implies a minimum eruption rate of ∼0.035 km3 yr−1, which is similar to rates found in West Greenland lavas but less than rates found in larger flood basalts. Despite this, the Baffin and West Greenland lavas temporally correlate with the “End C27n event” (a period of ∼2°C global warming) and may be its underlying cause.
    Description: his work was supported by the National Science Foundation (award #1911699 to F. Horton and award #2052963 to J. Biasi), Woods Hole Oceanographic Institution (WHOI) Andrew W. Mellon Foundation Endowed Fund for Innovative Research, a National Geographic Society grant (#CP4-144R-18), and internal funding from the Caltech Geological and Planetary Sciences Division.
    Keywords: Baffin island ; North Atlantic ; Flood basalt ; Paleomagnetism ; Volcanology ; Secular variation
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  • 7
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    Carbonation of serpentinite in creeping faults of California (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-21
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49(15), (2022): e2022GL099185, https://doi.org/10.1029/2022gl099185.
    Description: Several large strike slip faults in central and northern California accommodate plate motions through aseismic creep. Although there is no consensus regarding the underlying cause of aseismic creep, aqueous fluids and mechanically weak, velocity-strengthening minerals appear to play a central role. This study integrates field observations and thermodynamic modeling to examine possible relationships between the occurrence of serpentinite, silica-carbonate rock, and CO2-rich aqueous fluids in creeping faults of California. Our models predict that carbonation of serpentinite leads to the formation of talc and magnesite, followed by silica-carbonate rock. While abundant exposures of silica-carbonate rock indicate complete carbonation, serpentinite-hosted CO2-rich spring fluids are strongly supersaturated with talc at elevated temperatures. Hence, carbonation of serpentinite is likely ongoing in parts of the San Andres Fault system and operates in conjunction with other modes of talc formation that may further enhance the potential for aseismic creep, thereby limiting the potential for large earthquakes.
    Description: This work was supported by National Science Foundation (NSF) grants NSF-EAR-1220280 to F. K. and J. L., NSF-EAR-1219908 to D. G., and NSF-OCE-2001728 to J. L.
    Keywords: Mineral carbonation ; Serpentinite ; Talc ; CO2 ; Aseismic creep ; San Andreas Fault
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  • 8
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    Does sea spray aerosol contribute significantly to aerosol trace element loading? a case study from the US GEOTRACES Pacific Meridional Transect (GP15) (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-21
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marsay, C. M., Landing, W. M., Umstead, D., Till, C. P., Freiberger, R., Fitzsimmons, J. N., Lanning, N. T., Shiller, A. M., Hatta, M., Chmiel, R., Saito, M., & Buck, C. S. Does sea spray aerosol contribute significantly to aerosol trace element loading? a case study from the US GEOTRACES Pacific Meridional Transect (GP15). Global Biogeochemical Cycles, 36(8), (2022): e2022GB007416. https://doi.org/10.1029/2022GB007416.
    Description: Atmospheric deposition represents a major input for micronutrient trace elements (TEs) to the surface ocean and is often quantified indirectly through measurements of aerosol TE concentrations. Sea spray aerosol (SSA) dominates aerosol mass concentration over much of the global ocean, but few studies have assessed its contribution to aerosol TE loading, which could result in overestimates of “new” TE inputs. Low-mineral aerosol concentrations measured during the U.S. GEOTRACES Pacific Meridional Transect (GP15; 152°W, 56°N to 20°S), along with concurrent towfish sampling of surface seawater, provided an opportunity to investigate this aspect of TE biogeochemical cycling. Central Pacific Ocean surface seawater Al, V, Mn, Fe, Co, Ni, Cu, Zn, and Pb concentrations were combined with aerosol Na data to calculate a “recycled” SSA contribution to aerosol TE loading. Only vanadium was calculated to have a SSA contribution averaging 〉1% along the transect (mean of 1.5%). We derive scaling factors from previous studies on TE enrichments in the sea surface microlayer and in freshly produced SSA to assess the broader potential for SSA contributions to aerosol TE loading. Maximum applied scaling factors suggest that SSA could contribute significantly to the aerosol loading of some elements (notably V, Cu, and Pb), while for others (e.g., Fe and Al), SSA contributions largely remained 〈1%. Our study highlights that a lack of focused measurements of TEs in SSA limits our ability to quantify this component of marine aerosol loading and the associated potential for overestimating new TE inputs from atmospheric deposition.
    Description: This research was supported by the National Science Foundation (NSF) grants OCE-1756103 to C. S. Buck, OCE-1756104 to W. M. Landing, OCE-1737024 to A.M. Shiller, OCE-1736906 to M. Hatta, OCE-1736875 to C. P. Till, OCE-1737167 to J. N. Fitzsimmons, and OCE-1736599 to M. Saito. In addition, N. T. Lanning was supported by the NSF Graduate Research Fellowship Program award 1746932.
    Keywords: Aerosols ; Trace elements ; GEOTRACES ; Sea spray aerosol ; Pacific Ocean
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  • 9
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    Using misorientation and weighted burgers vector statistics to understand intragranular boundary development and grain boundary formation at high temperatures (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-21
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Solid Earth 127(8), (2022): e2022JB024497, https://doi.org/10.1029/2022JB024497.
    Description: During plastic deformation, strain weakening can be achieved, in part, via strain energy reduction associated with intragranular boundary development and grain boundary formation. Grain boundaries (in 2D) are segments between triple junctions, that connect to encircle grains; every boundary segment in the encircling loop has a high (〉10°) misorientation angle. Intragranular boundaries terminate within grains or dissect grains, usually containing boundary segments with a low (〈10°) misorientation angle. We analyze electron backscatter diffraction (EBSD) data from ice deformed at −30°C (Th≈ 0.9). Misorientation and weighted Burgers vector (WBV) statistics are calculated along planar intragranular boundaries. Misorientation angles change markedly along each intragranular boundary, linking low- (〈10°) and high-angle (10–38°) segments that exhibit distinct misorientation axes and WBV directions. We suggest that these boundaries might be produced by the growth and intersection of individual intragranular boundary segments comprising dislocations with distinct slip systems. There is a fundamental difference between misorientation axis distributions of intragranular boundaries (misorientation axes mostly confined to ice basal plane) and grain boundaries (no preferred misorientation axis). These observations suggest during progressive subgrain rotation, intragranular boundaries remain crystallographically controlled up to large misorientation angles (〉〉10°). In contrast, the apparent lack of crystallographic control for grain boundaries suggests misorientation axes become randomized, likely due to the activation of additional mechanisms (such as grain boundary sliding) after grain boundary formation, linking boundary segments to encircle a grain. Our findings on ice intragranular boundary development and grain boundary formation may apply more broadly to other rock-forming minerals (e.g., olivine, quartz).
    Description: This work was supported by a NASA fund (Grant No. NNX15AM69G) to David L. Goldsby and two Marsden Funds of the Royal Society of New Zealand (Grant Nos. UOO1116, UOO052) to David J. Prior. Sheng Fan was supported by the University of Otago doctoral scholarship, the Antarctica New Zealand doctoral scholarship, a research grant from New Zealand Ministry of Business, Innovation and Employment through the Antarctic Science Platform (ANTA1801) (Grant No. ASP-023-03), and a New Zealand Antarctic Research Institute (NZARI) Early Career Researcher Seed Grant (Grant No. NZARI 2020-1-5). Open access publishing facilitated by University of Otago, as part of the Wiley – University of Otago agreement via the Council of Australian University Librarians.
    Keywords: High temperature deformation ; Misorientation ; Weighted Burgers vector ; Intragranular boundary ; Grain boundary ; Boundary geometry
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  • 10
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    Monitoring volcanic activity through combined measurements of CO2 efflux and (222Rn) and (220Rn) in soil gas: an application to Mt. Etna (Italy) (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-07
    Description: We present measurements of soil CO2 effluxes combined with soil (222Rn) and (220Rn) from two high-degassing areas on the lower flanks of Mt. Etna volcano (ZE-SV on the E flank and PAT on the SW flank). Measurements were conducted periodically from June 2006 to January 2009 in the ZE-SV area and January 2007 to January 2009 in the PAT area. The results showed significant variations in discharge activity and style. Log values of (220Rn)/(222Rn) and CO2 efflux generally follow a negative correlation, herein parameterized as the Soil Gas Disequilibrium Index (SGDI). Deviations of the SGDI from this negative correlation provide insight into variance of localized and shallow system conditions, namely rock fracturing, residual magma degassing, and near surface interactions between magmatic gases and groundwater. Statistical analysis highlighted signal anomalies, both negative and positive, that were modeled according to the physical properties and the modes of transport for each of the SGDI gas components. The revealed anomalies show correspondence with episodes of magma ascent and eruption, thereby demonstrating the potential of using the SGDI as another instrument for forecasting volcanic activity. An important strength of the SGDI, compared to other magma gas proxies like CO2 or SO2, is that the very short and very different half-lives of 222Rn (t1/2 = 3.85 days) and 220Rn (t1/2 = 55 seconds) provide unique information on the timescales of soil gas transport. Coupling the SGDI with other pre-eruptive proxies enhances the volcanological community’s response capabilities, which is critical for effective hazard mitigation.
    Description: Published
    Description: 167-202
    Description: 4V. Processi pre-eruttivi
    Keywords: Soil gases ; radon ; carbon dioxide ; volcano monitoring ; 04.08. Volcanology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 11
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    Relative timing of off‐axis volcanism from sediment thickness estimates on the 8°20’N seamount chain, East Pacific Rise (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-16
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Fabbrizzi, A., Parnell‐Turner, R., Gregg, P., Fornari, D., Perfit, M., Wanless, V., & Anderson, M. Relative timing of off‐axis volcanism from sediment thickness estimates on the 8°20’N seamount chain, East Pacific Rise. Geochemistry, Geophysics, Geosystems, 23(9), (2022): e2022GC010335, https://doi.org/10.1029/2022gc010335.
    Description: Volcanic seamount chains on the flanks of mid-ocean ridges record variability in magmatic processes associated with mantle melting over several millions of years. However, the relative timing of magmatism on individual seamounts along a chain can be difficult to estimate without in situ sampling and is further hampered by Ar40/Ar39 dating limitations. The 8°20’N seamount chain extends ∼170 km west from the fast-spreading East Pacific Rise (EPR), north of and parallel to the western Siqueiros fracture zone. Here, we use multibeam bathymetric data to investigate relationships between abyssal hill formation and seamount volcanism, transform fault slip, and tectonic rotation. Near-bottom compressed high-intensity radiated pulse, bathymetric, and sidescan sonar data collected with the autonomous underwater vehicle Sentry are used to test the hypothesis that seamount volcanism is age-progressive along the seamount chain. Although sediment on seamount flanks is likely to be reworked by gravitational mass-wasting and current activity, bathymetric relief and Sentry vehicle heading analysis suggest that sedimentary accumulations on seamount summits are likely to be relatively pristine. Sediment thickness on the seamounts' summits does not increase linearly with nominal crustal age, as would be predicted if seamounts were constructed proximal to the EPR axis and then aged as the lithosphere cooled and subsided away from the ridge. The thickest sediments are found at the center of the chain, implying the most ancient volcanism there, rather than on seamounts furthest from the EPR. The nonlinear sediment thickness along the 8°20’N seamounts suggests that volcanism can persist off-axis for several million years.
    Description: This work was supported by National Science Foundation awards OCE-1356610, OCE-1356822, OCE-1357150, OCE-1754419, OCE-1834797, OCE-2001314, and OCE-2001331.
    Keywords: Off-axis seamounts ; East Pacific Rise ; Sediment thickness ; Seafloor morphology ; Autonomous underwater vehicle ; Eruption history
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  • 12
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    Size-differentiated export flux in different dynamical regimes in the ocean (2021)
    American Geophysical Union
    Details
    Publication Date: 2023-02-17
    Description: Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 35(3), (2021): e2020GB006764, https://doi.org/10.1029/2020GB006764
    Description: Export of Particulate Organic Carbon (POC) is mainly driven by gravitational sinking. Thus, traditionally, it is thought that larger, faster-sinking particles make up most of the POC export flux. However, this need not be the case for particles whose sinking speeds are comparable to the vertical velocities of a dynamic flow field that can influence the descent rate of particles. Particles with different settling speeds are released in two process-oriented model simulations of an upper ocean eddying flow in the Northeast Pacific to evaluate the impact of (1) ocean dynamics on the respective contribution of the different sinking-velocity classes to POC export, and (2) the particle number size-spectrum slope. The analysis reveals that the leading export mechanism changes from gravitationally driven to advectively driven as submesoscale dynamics become more active in the region. The vertical velocity associated with submesoscale dynamics enhances the contribution of slower-sinking particles to POC export flux by a factor ranging from 3 to 10, especially where the relative abundance of small particles is large (i.e., steep particle size-spectrum slope). Remineralization generally decreases the total amount of biomass exported, but its impact is weaker in dynamical regimes where submesoscale dynamics are present and export is advectively driven. In an advectively driven export regime, remineralization processes counter-intuitively enhance the role of slower-sinking particles to the point where these slower-sinking velocity classes dominate the export, therefore challenging the traditional paradigm for POC export. This study demonstrates that slow-sinking particles can be a significant contribution, and at times, even dominate the export flux.
    Description: The work was funded by NASA grant NNX16AR48 G, to complement the EXport Processes in the global Ocean from RemoTe Sensing (EXPORTS) program.
    Description: 2021-08-17
    Keywords: Export ; Flux ; Particulate organic carbon ; Sinking rates ; Submeso-scales ; Vertical velocities
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  • 13
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    The influence of ocean topography on the upwelling of carbon in the Southern Ocean (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-17
    Description: Author Posting. © American Geophysical Union, 2021. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 48(19), (2021): e2021GL095088, https://doi.org/10.1029/2021GL095088.
    Description: The physical circulation of the Southern Ocean sets the surface concentration and thus air-sea exchange of CO2. However, we have a limited understanding of the three-dimensional circulation that brings deep carbon-rich waters to the surface. Here, we introduce and analyze a novel high-resolution ocean model simulation with active biogeochemistry and online Lagrangian particle tracking. We focus our attention on a subset of particles with high dissolved inorganic carbon (DIC) that originate below 1,000 m and eventually upwell into the near-surface layer (upper 200 m). We find that 71% of the DIC-enriched water upwelling across 1,000 m is concentrated near topographic features, which occupy just 33% of the Antarctic Circumpolar Current. Once particles upwell to the near-surface layer, they exhibit relatively uniform pCO2 levels and DIC decorrelation timescales, regardless of their origin. Our results show that Southern Ocean bathymetry plays a key role in delivering carbon-rich waters to the surface.
    Description: Riley X. Brady was supported by the Department of Energy's Computational Science Graduate Fellowship (DE-FG02-97ER25308), and particularly benefited from the fellowship's summer practicum at Los Alamos National Lab. Nicole S. Lovenduski and Riley X. Brady were further supported by the U.S. Department of Energy Biological and Environmental Research program (DE-SC0022243) and by the National Science Foundation (NSF-PLR 1543457; NSF-OCE 1924636; NSF-OCE 1752724; NSF-OCE 1558225). Mathew E. Maltrud and Phillip J. Wolfram were supported as part of the Energy Exascale Earth System Model (E3SM) project, funded by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research. This research used resources provided by the Los Alamos National Laboratory Institutional Computing Program, which is supported by the U.S. Department of Energy National Nuclear Security Administration under Contract No. 89233218CNA000001.
    Keywords: Southern Ocean ; Carbon cycle ; Upwelling ; Lagrangian modeling ; Ocean biogeochemistry ; Climate modeling
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  • 14
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    Submarine groundwater discharge in the northern Bohai Sea, China: Implications for coastal carbon budgets and buffering capacity (2022)
    American Geophysical Union
    Details
    Publication Date: 2023-01-20
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 127(8), (2022): e2022JG006810, https://doi.org/10.1029/2022jg006810.
    Description: Submarine groundwater discharge (SGD) has been widely recognized as an important source of dissolved nutrients in coastal waters and affects nutrient biogeochemistry. In contrast, little information is available on SGD impacts on coastal carbon budgets. Here, we assessed the SGD and associated carbon (dissolved inorganic carbon [DIC] and total alkalinity [TA]) fluxes in Liaodong Bay (the largest bay of the Bohai Sea, China) and discussed their border implications for coastal DIC budget and buffering capacity. Based on 223Ra and 228Ra mass balance models, the SGD flux was estimated to be (0.92–1.43) × 109 m3 d−1. SGD was the largest contributor of DIC, accounting for 55%–77% of the total DIC sources. The low ratio (〈1) of SGD-derived TA to DIC fluxes and negative correlation between radium isotopes and pH in seawater implied that SGD would potentially reduce seawater pH in Liaodong Bay. Combining the groundwater carbon data in Liaodong Bay with literature data, we found that the SGD-derived DIC flux off China was 4–9 times greater than those from rivers. By analyzing the TA/DIC ratios in groundwater along the Chinese coast and related carbon fluxes, SGD was thought to partially reduce the CO2 buffer capacity in receiving seawater. These results obtained at the bay scale and national scale suggest that SGD is a significant component of carbon budget and may play a critical role in modulating coastal buffering capacity and atmospheric CO2 sequestration.
    Description: his research was supported by National Natural Science Foundation of China (Grant Nos. 42130703, 42007170) and the Science, Technology and Innovation Commission of Shenzhen (Grant No. 20200925174525002.
    Description: 2023-01-20
    Keywords: Submarine groundwater discharge ; Radium isotopes ; Dissolved inorganic carbon ; Total alkalinity ; Carbon budgets ; Buffering capacity
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  • 15
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    Superparamagnetic Iron Oxide Nanoparticle Nanodevices Based on Fe3O4 Coated by Megluminic Ligands for the Adsorption of Metal Anions from Water (2023)
    American Chemical Society
    Details
    Publication Date: 2023-01-16
    Description: The uptake ability toward arsenic(V), chromium(VI), and boron(III) ions of ad hoc functionalized magnetic nanostructured devices has been investigated. To this purpose, ligands based on meglumine have been synthesized and used to coat magnetite nanoparticles (Fe3O4) obtained by the co-precipitation methodology. The as-prepared hybrid material was characterized by infrared spectroscopy (IR), X-ray diffraction, thermogravimetric analysis, and scanning electron microscopy combined with energy-dispersive X-ray analysis. Moreover, its magnetic hysteresis properties were measured to evaluate its magnetic properties, and the adsorption kinetics and isothermal models were applied to discern between the different adsorption phenomena. Specifically, the better fitting was observed by the Langmuir isotherm model for all metal ions tested, highlighting a higher uptake in arsenic (28.2 mg/g), chromium (12.3 mg/g), and boron (23.7 mg/g) sorption values if compared with other magnetic nanostructured materials. After adsorption, an external magnetic stimulus can be used to efficiently remove nanomaterials from the water. Finally the nanomaterial can be reused up to five cycles and regenerated for another three cycles.
    Description: Published
    Description: 10775–10788
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 16
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    Retrieving a “Weather Balloon” from the last Ice Age (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-28
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Seltzer, A. M., & Tyne, R. L. Retrieving a “Weather Balloon” from the last Ice Age. AGU Advances, 3(4), (2022): e2022AV000747, https://doi.org/10.1029/2022AV000747.
    Description: “How cold was the last ice age?” is a question that paleoclimate scientists have been trying to answer for decades. Constraining the magnitude of climate change since the Last Glacial Maximum (∼20,000 years ago) can help improve our understanding of Earth's climate sensitivity and, therefore enhance our ability to predict future change (Tierney et al., 2020). Of course, there is no single answer to this question: there is spatial structure to LGM temperature change that is linked to fundamental climate system properties and processes. Consequently, paleoclimate scientists have focused on variations of this question, like “What was the latitudinal gradient of LGM temperature change?” (Chiang et al., 2003), “What was the land-sea contrast?” (Rind & Peteet, 1985) or “What was the change in ocean heat content?” (Bereiter et al., 2018). These questions inform large-scale atmospheric and oceanic circulation, the intensity of the water cycle, and planetary energy balance; the answers to these questions come from proxies like planktic and benthic foraminifera, speleothems, ice cores, pollen records, ancient groundwater, lake sediments, and glacial moraines, to name a few. In short, the paleoclimate community has developed a proxy “tool kit” equipped to map changes across the Earth's surface and into the ocean interior; but, until now, no “tool” existed for the upper atmosphere.
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  • 17
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    Sediments in sea ice drive the Canada Basin surface Mn maximum: insights from an Arctic Mn Ocean model (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-28
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 36(8), (2022): e2022GB007320, https://doi.org/10.1029/2022GB007320.
    Description: Biogeochemical cycles in the Arctic Ocean are sensitive to the transport of materials from continental shelves into central basins by sea ice. However, it is difficult to assess the net effect of this supply mechanism due to the spatial heterogeneity of sea ice content. Manganese (Mn) is a micronutrient and tracer which integrates source fluctuations in space and time while retaining seasonal variability. The Arctic Ocean surface Mn maximum is attributed to freshwater, but studies struggle to distinguish sea ice and river contributions. Informed by observations from 2009 IPY and 2015 Canadian GEOTRACES cruises, we developed a three-dimensional dissolved Mn model within a 1/12° coupled ocean-ice model centered on the Canada Basin and the Canadian Arctic Archipelago (CAA). Simulations from 2002 to 2019 indicate that annually, 87%–93% of Mn contributed to the Canada Basin upper ocean is released by sea ice, while rivers, although locally significant, contribute only 2.2%–8.5%. Downstream, sea ice provides 34% of Mn transported from Parry Channel into Baffin Bay. While rivers are often considered the main source of Mn, our findings suggest that in the Canada Basin they are less important than sea ice. However, within the shelf-dominated CAA, both rivers and sediment resuspension are important. Climate-induced disruption of the transpolar drift may reduce the Canada Basin Mn maximum and supply downstream. Other micronutrients found in sediments, such as Fe, may be similarly affected. These results highlight the vulnerability of the biogeochemical supply mechanisms in the Arctic Ocean and the subpolar seas to climatic changes.
    Description: This work was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) Climate Change and Atmospheric Research Grant: GEOTRACES (RGPCC 433848-12) and VITALS (RGPCC 433898), an NSERC Discovery Grant (RGPIN-2016-03865) to SEA, and by the University of British Columbia through a four year fellowship to BR. Computing resources were provided by Compute Canada (RRG 2648 RAC 2019, RRG 2969 RAC 2020, and RRG 1541 RAC 2021).
    Keywords: GEOTRACES ; Arctic Ocean ; Trace elements ; Canadian Arctic Archipelago ; Ocean modeling ; Micronutrients
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    WISTFUL: whole‐rock interpretative seismic toolbox for ultramafic lithologies (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-28
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Shinevar, W., Jagoutz, O., & Behn, M. WISTFUL: whole‐rock interpretative seismic toolbox for ultramafic lithologies. Geochemistry, Geophysics, Geosystems, 23(8), (2022): e2022GC010329, https://doi.org/10.1029/2022gc010329.
    Description: To quantitatively convert upper mantle seismic wave speeds measured into temperature, density, composition, and corresponding and uncertainty, we introduce the Whole-rock Interpretative Seismic Toolbox For Ultramafic Lithologies (WISTFUL). WISTFUL is underpinned by a database of 4,485 ultramafic whole-rock compositions, their calculated mineral modes, elastic moduli, and seismic wave speeds over a range of pressure (P) and temperature (T) (P = 0.5–6 GPa, T = 200–1,600°C) using the Gibbs free energy minimization routine Perple_X. These data are interpreted with a toolbox of MATLAB® functions, scripts, and three general user interfaces: WISTFUL_relations, which plots relationships between calculated parameters and/or composition; WISTFUL_geotherms, which calculates seismic wave speeds along geotherms; and WISTFUL_inversion, which inverts seismic wave speeds for best-fit temperature, composition, and density. To evaluate our methodology and quantify the forward calculation error, we estimate two dominant sources of uncertainty: (a) the predicted mineral modes and compositions, and (b) the elastic properties and mixing equations. To constrain the first source of uncertainty, we compiled 122 well-studied ultramafic xenoliths with known whole-rock compositions, mineral modes, and estimated P-T conditions. We compared the observed mineral modes with modes predicted using five different thermodynamic solid solution models. The Holland et al. (2018, https://doi.org/10.1093/petrology/egy048) solution models best reproduce phase assemblages (∼12 vol. % phase root-mean-square error [RMSE]) and estimated wave speeds. To assess the second source of uncertainty, we compared wave speed measurements of 40 ultramafic rocks with calculated wave speeds, finding excellent agreement (Vp RMSE = 0.11 km/s). WISTFUL easily analyzes seismic datasets, integrates into modeling, and acts as an educational tool.
    Description: Funding for this study was provided by NSF Grants EAR-17-22935 (OJ) and EAR-18-44340 (MB).
    Keywords: Seismic velocity ; Seismic wave speed ; Thermodynamic modeling ; Density ; Composition ; Elastic moduli
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  • 19
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    Can we estimate air‐sea flux of biological O2 from total dissolved oxygen? (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-02
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 36(9), (2022): e2021GB007145, https://doi.org/10.1029/2021gb007145.
    Description: In this study, we compare mechanistic and empirical approaches to reconstruct the air-sea flux of biological oxygen (F[O2]bio-as) by parameterizing the physical oxygen saturation anomaly (ΔO2[phy]) in order to separate the biological contribution from total oxygen. The first approach matches ΔO2[phy] to the monthly climatology of the argon saturation anomaly from a global ocean circulation model's output. The second approach derives ΔO2[phy] from an iterative mass balance model forced by satellite-based physical drivers of ΔO2[phy] prior to the sampling day by assuming that air-sea interactions are the dominant factors driving the surface ΔO2[phy]. The final approach leverages the machine-learning technique of Genetic Programming (GP) to search for the functional relationship between ΔO2[phy] and biophysicochemical parameters. We compile simultaneous measurements of O2/Ar and O2 concentration from 14 cruises to train the GP algorithm and test the validity and applicability of our modeled ΔO2[phy] and F[O2]bio-as. Among the approaches, the GP approach, which incorporates ship-based measurements and historical records of physical parameters from the reanalysis products, provides the most robust predictions (R2 = 0.74 for ΔO2[phy] and 0.72 for F[O2]bio-as; RMSE = 1.4% for ΔO2[phy] and 7.1 mmol O2 m−2 d−1 for F[O2]bio-as). We use the empirical formulation derived from GP approach to reconstruct regional, inter-annual, and decadal variability of F[O2]bio-as based on historical oxygen records. Overall, our study represents a first attempt at deriving F[O2]bio-as from snapshot measurements of oxygen, thereby paving the way toward using historical O2 data and a rapidly growing number of O2 measurements on autonomous platforms for independent insight into the biological pump.
    Description: N. Cassar was supported by the “Laboratoire d'Excellence” LabexMER (ANR-10-LABX-19) and co-funded by a grant from the French government under the program “Investissements d'Avenir.” Y. Huang was supported by grants from the China NSF (Nos. 42130401 and 42141002). Y. Huang was also partly supported by Chinese State Scholarship Fund to study at Duke University as a joint PhD student (No. 201806310052). R. Eveleth was supported by the NSF GRFP under grant (No. 1106401). D. Nicholson was supported by the NSF OCE-1129973 and OCE-1923915.
    Keywords: Air-sea gas biological oxygen flux ; Physical oxygen saturation anomaly ; Total dissolved oxygen ; Mechanistic and empirical models
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  • 20
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    Accuracy and reproducibility of coral Sr/Ca SIMS timeseries in modern and fossil corals (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-08
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Sayani, H., Cobb, K., Monteleone, B., & Bridges, H. Accuracy and reproducibility of coral Sr/Ca SIMS timeseries in modern and fossil corals. Geochemistry, Geophysics, Geosystems, 23(9), (2022): e2021GC010068, https://doi.org/10.1029/2021gc010068.
    Description: Coral strontium-to-calcium ratios (Sr/Ca) provide quantitative estimates of past sea surface temperatures (SST) that allow for the reconstruction of changes in the mean state and climate variations, such as the El Nino-Southern Oscillation, through time. However, coral Sr/Ca ratios are highly susceptible to diagenesis, which can impart artifacts of 1–2°C that are typically on par with the tropical climate signals of interest. Microscale sampling via Secondary Ion Mass Spectrometry (SIMS) for the sampling of primary skeletal material in altered fossil corals, providing much-needed checks on fossil coral Sr/Ca-based paleotemperature estimates. In this study, we employ a set modern and fossil corals from Palmyra Atoll, in the central tropical Pacific, to quantify the accuracy and reproducibility of SIMS Sr/Ca analyses relative to bulk Sr/Ca analyses. In three overlapping modern coral samples, we reproduce bulk Sr/Ca estimates within ±0.3% (1σ). We demonstrate high fidelity between 3-month smoothed SIMS coral Sr/Ca timeseries and SST (R = −0.5 to −0.8; p 〈 0.5). For lightly-altered sections of a young fossil coral from the early-20th century, SIMS Sr/Ca timeseries reproduce bulk Sr/Ca timeseries, in line with our results from modern corals. Across a moderately-altered section of the same fossil coral, where diagenesis yields bulk Sr/Ca estimates that are 0.6 mmol too high (roughly equivalent to −6°C artifacts in SST), SIMS Sr/Ca timeseries track instrumental SST timeseries. We conclude that 3–4 SIMS analyses per month of coral growth can provide a much-needed quantitative check on the accuracy of fossil coral Sr/Ca-derived estimates of paleotemperature, even in moderately altered samples.
    Description: We'd also like to thank Yolande Berta and Georgia Tech's Center for Nanostructure Characterization for providing access to their SEM facilities, and the Khaled bin Sultan Living Ocean Foundation and The Nature Conservancy for financial and logistical support for field excursions to Palmyra. Funding for this work was provided by the National Science Foundation (Award Numbers 1502832 and 2002458 to K.M.C) and the National Oceanic and Atmospheric Administration (Award Number: NA11OAR4310165 to K.M.C).
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  • 21
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    Observational and modeling evidence of seasonal trends in sediment-derived material inputs to the Chukchi Sea (2020)
    American Geophysical Union
    Details
    Publication Date: 2023-03-08
    Description: Author Posting. © American Geophysical Union, 2020. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 125(5), (2020): e2019JC016007, doi:10.1029/2019JC016007.
    Description: Benthic inputs of nutrients help support primary production in the Chukchi Sea and produce nutrient‐rich water masses that ventilate the halocline of the western Arctic Ocean. However, the complex biological and redox cycling of nutrients and trace metals make it difficult to directly monitor their benthic fluxes. In this study, we use radium‐228, which is a soluble radionuclide produced in sediments, and a numerical model of an inert, generic sediment‐derived tracer to study variability in sediment inputs to the Chukchi Sea. The 228Ra observations and modeling results are in general agreement and provide evidence of strong benthic inputs to the southern Chukchi Sea during the winter, while the northern shelf receives higher concentrations of sediment‐sourced materials in the spring and summer due to continued sediment‐water exchange as the water mass traverses the shelf. The highest tracer concentrations are observed near the shelfbreak and southeast of Hanna Shoal, a region known for high biological productivity and enhanced benthic biomass.
    Description: This study presents data from multiple Arctic expeditions over the past two decades, and we are indebted to the captains, crews, and scientific parties that made this data collection possible. This work was funded by NSF awards OCE‐1458305 to M. Charette, OCE‐1458424 to W. Moore, OCE‐1434085 to D. Kadko, PLR‐1504333 to R. Pickart, and OPP‐1822334 to M. Spall. Funding was also provided by National Oceanic and Atmospheric Administration Grant NA14‐OAR4320158 to R. Pickart. L. Kipp was supported by an Ocean Frontier Institute Postdoctoral Fellowship. Radium data used in this manuscript are available in Table S1.
    Description: 2020-10-27
    Keywords: Chukchi Sea ; Benthic flux ; Radium‐228 ; GEOTRACES
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  • 22
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    Drifter observations reveal intense vertical velocity in a surface ocean front (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-11
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Tarry, D., Ruiz, S., Johnston, T., Poulain, P., Özgökmen, T., Centurioni, L., Berta, M., Esposito, G., Farrar, J., Mahadevan, A., & Pascual, A. Drifter observations reveal intense vertical velocity in a surface ocean front. Geophysical Research Letters, 49(18), (2022): e2022GL098969, https://doi.org/10.1029/2022gl098969.
    Description: Measuring vertical motions represent a challenge as they are typically 3–4 orders of magnitude smaller than the horizontal velocities. Here, we show that surface vertical velocities are intensified at submesoscales and are dominated by high frequency variability. We use drifter observations to calculate divergence and vertical velocities in the upper 15 m of the water column at two different horizontal scales. The drifters, deployed at the edge of a mesoscale eddy in the Alboran Sea, show an area of strong convergence (urn:x-wiley:00948276:media:grl64766:grl64766-math-0001(f)) associated with vertical velocities of −100 m day−1. This study shows that a multilayered-drifter array can be an effective tool for estimating vertical velocity near the ocean surface.
    Description: This research was supported by the Office of Naval Research (ONR) Departmental Research Initiative CALYPSO under program officers Terri Paluszkiewicz and Scott Harper. The authors' ONR Grant No. are as follows: DT, SR, AM, and AP N000141613130, TMSJ N000146101612470, PP N000141812418, TO N000141812138, LRC N000141712517, and N00014191269, MB and GE N000141812782 and N000141812039, and JTF N000141812431.
    Keywords: Drifters ; Vertical velocity ; Submesoscale ; Kinematic properties ; Fronts ; Alboran Sea
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  • 23
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    Volcano monitoring with magnetic measurements: a simulation of eruptions at axial seamount, Kilauea, Baroarbunga, and Mount Saint Helens (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-11
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biasi, J., Tivey, M., & Fluegel, B. Volcano monitoring with magnetic measurements: a simulation of eruptions at axial seamount, Kilauea, Baroarbunga, and Mount Saint Helens. Geophysical Research Letters, 49(17), (2022): e2022GL100006, https://doi.org/10.1029/2022GL100006.
    Description: Monitoring of active volcanic systems is a challenging task due in part to the trade-offs between collection of high-quality data from multiple techniques and the high costs of acquiring such data. Here we show that magnetic data can be used to monitor volcanoes by producing similar data to gravimetric techniques at significantly lower cost. The premise of this technique is that magma and wall rock above the Curie temperature are magnetically “transparent,” but not stationary within the crust. Subsurface movements of magma can affect the crustal magnetic field measured at the surface. We construct highly simplified magnetic models of four volcanic systems: Mount Saint Helens (1980), Axial Seamount (2015–2020), Kīlauea (2018), and Bárðarbunga (2014). In all cases, observed or inferred changes to the magmatic system would have been detectable by modern magnetometers. Magnetic monitoring could become common practice at many volcanoes, particularly in developing nations with high volcanic risk.
    Description: This work was supported by the NSF Grant No 2052963 to J. Biasi and an internal Woods Hole Oceanographic Institution grant to M. Tivey.
    Keywords: Magnetism ; Volcanic hazards ; Hawaii ; Iceland ; Volcanology ; Monitoring
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  • 24
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    Radium inputs into the Arctic Ocean from rivers a basin‐wide estimate (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-03-11
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Bullock, E., Kipp, L., Moore, W., Brown, K., Mann, P., Vonk, J., Zimov, N., & Charette, M. Radium inputs into the Arctic Ocean from rivers a basin‐wide estimate. Journal of Geophysical Research: Oceans, 127(9), (2022): e2022JC018964, https://doi.org/10.1029/2022jc018964.
    Description: Radium isotopes have been used to trace nutrient, carbon, and trace metal fluxes inputs from ocean margins. However, these approaches require a full accounting of radium sources to the coastal ocean including rivers. Here, we aim to quantify river radium inputs into the Arctic Ocean for the first time for 226Ra and to refine the estimates for 228Ra. Using new and existing data, we find that the estimated combined (dissolved plus desorbed) annual 226Ra and 228Ra fluxes to the Arctic Ocean are [7.0–9.4] × 1014 dpm y−1 and [15–18] × 1014 dpm y−1, respectively. Of these totals, 44% and 60% of the river 226Ra and 228Ra, respectively are from suspended sediment desorption, which were estimated from laboratory incubation experiments. Using Ra isotope data from 20 major rivers around the world, we derived global annual 226Ra and 228Ra fluxes of [7.4–17] × 1015 and [15–27] × 1015 dpm y−1, respectively. As climate change spurs rapid Arctic warming, hydrological cycles are intensifying and coastal ice cover and permafrost are diminishing. These river radium inputs to the Arctic Ocean will serve as a valuable baseline as we attempt to understand the changes that warming temperatures are having on fluxes of biogeochemically important elements to the Arctic coastal zone.
    Description: This study was a broad, collaborative effort that would not have been possible without contributions from numerous funding sources, including the National Science Foundation (NSF-0751525, NSF-1736277, NSF-1458305, NSF-1938873, NSF-2048067, NSF-2134865), the NERC-BMBF project CACOON [NE/R012806/1] (UKRI NERC) and BMBF-03F0806A, and an EU Starting Grant (THAWSOME-676982).
    Keywords: Radium isotopes ; Arctic Ocean ; River fluxes
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  • 25
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    Passive Sampler Derived Profiles and Mass Flows of Perfluorinated Alkyl Substances (PFASs) across the Fram Strait in the North Atlantic (2024)
    American Chemical Society
    In:  EPIC3Environmental Science & Technology Letters, American Chemical Society
    Details
    Publication Date: 2024-01-24
    Repository Name: EPIC Alfred Wegener Institut
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  • 26
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    Constraints on the Cryohydrological Warming of Firn and Ice in Greenland From Rayleigh Wave Ellipticity Data (2024)
    American Geophysical Union
    Details
    Publication Date: 2024-04-05
    Description: Rayleigh wave ellipticity measurements from seismic ambient noise recorded on the Greenland Ice Sheet (GrIS) show complex and anomalous behavior at wave periods sensitive to ice (T 〈 3–4 s). To understand these complex observations, we compare them with synthetic ellipticity measurements obtained from synthetic ambient noise computed for various seismic velocity and attenuation models, including surface wave overtone effects. We find that in dry snow conditions within the interior of the GrIS, to first order the anomalous ellipticity observations can be explained by ice models associated with the accumulation and densification of snow into firn. We also show that the distribution of ellipticity measurements is strongly sensitive to seismic attenuation and the thermal structure of the ice. Our results suggest that Rayleigh wave ellipticity is well suited for monitoring changes in firn properties and thermal composition of the Greenland and Antarctic ice sheets in a changing climate.
    Description: Published
    Description: e2023GL103673
    Description: OST1 Alla ricerca dei Motori Geodinamici
    Description: JCR Journal
    Keywords: 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 27
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    Carbon Stocks and Potential Greenhouse Gas Production of Permafrost-Affected Active Floodplains in the Lena River Delta (2024)
    American Geophysical Union
    In:  EPIC3Journal of Geophysical Research (JGR): Biogeosciences, American Geophysical Union, 129, ISSN: 2169-8953
    Details
    Publication Date: 2024-04-19
    Description: Arctic warming increases the degradation of permafrost soils but little is known about floodplain soils in the permafrost region. This study quantifies soil organic carbon (SOC) and soil nitrogen stocks, and the potential CH4 and CO2 production from seven cores in the active floodplains in the Lena River Delta, Russia. The soils were sandy but highly heterogeneous, containing deep, organic rich deposits with 〉60% SOC stored below 30 cm. The mean SOC stocks in the top 1 m were 12.9 ± 6.0 kg C m−2. Grain size analysis and radiocarbon ages indicated highly dynamic environments with sediment re-working. Potential CH4 and CO2 production from active floodplains was assessed using a 1-year incubation at 20°C under aerobic and anaerobic conditions. Cumulative aerobic CO2 production mineralized a mean 4.6 ± 2.8% of initial SOC. The mean cumulative aerobic:anaerobic C production ratio was 2.3 ± 0.9. Anaerobic CH4 production comprised 50 ± 9% of anaerobic C mineralization; rates were comparable or exceeded those for permafrost region organic soils. Potential C production from the incubations was correlated with total organic carbon and varied strongly over space (among cores) and depth (active layer vs. permafrost). This study provides valuable information on the carbon cycle dynamics from active floodplains in the Lena River Delta and highlights the key spatial variability, both among sites and with depth, and the need to include these dynamic permafrost environments in future estimates of the permafrost carbon-climate feedback.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 28
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    Greenland Ice Sheet mass balance GRACE/GRACE-FO (2003-2019) and SMB-D (1948-2019) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: Data underlying figures 1, 2, 3 and 5. Figure 1: Monthly mass changes of the Greenland Ice Sheet from GRACE/GRACE-FO and SMB-D (2003-2019) Figure 2: Biennial mass balance and its components from GRACE/GRACE-FO and SMB-D (2003-2018) for the Greenland Ice Sheet, along with regional estimates for 2017-2018 for East and West. Figure 3: Rate of mass change for year 2019 from GRACE/GRACE-FO and SMB-D Figure 5: Annual mass balance and its main components from SMB-D (1948-2019) and GRACE/GRACE-FO (2003-2019)
    Keywords: GRACE; GRACE-FO; Greenland; Helmholtz-Verbund Regionale Klimaänderungen = Helmholtz Climate Initiative (Regional Climate Change); ice dynamic discharge; ice sheet mass balance; REKLIM; sea-level rise; surface mass balance
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 29
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    Pollen counts, AMS C14 and Pb-210/Cs-137 dating in sediment cores from three lakes along an open larch forest-forest tundra-tundra transect in the Omoloy region, north-eastern Siberia (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: Here, we provide the raw pollen data archived in three Siberian lake sediment cores spanning the mid-Holocene to the present (7.6-0 cal ka BP), from northern typical tundra to southern open larch forest in the Omoloy region. There are three cores: 1. 14-OM-20B, Lat. / °: 70.53, Lon. / °: 132.91, Ele. / m a.s.l.: 52, Modern vegetation: open larch forest, Lake area / km2: 0.26, Maximal depth / m: 3.4 2. 14-OM-02B, Lat. / °: 70.72, Lon. / °: 132.67, Ele. / m a.s.l.: 58, Modern vegetation: forest tundra, Lake area / km2: 0.08, Maximal depth / m: 3.5 3. 14-OM-12A, Lat. / °: 70.96, Lon. / °: 132.57, Ele. / m a.s.l.: 60, Modern vegetation: tundra, Lake area / km2: 0.09, Maximal depth / m: 4.5 Three lake sediment cores, 14OM12A (33 cm long), 14OM02B (49.5 cm long) and 14OM20B (86 cm long), were recovered from three sites using a UWITEC gravity corer (6 cm internal diameter) equipped with a hammer tool in July 2014. From the three cores, 16 bulk organic carbon samples were selected because of the lack of macrofossil remains and radiocarbon dated using accelerator mass spectrometry (AMS) at Poznań radiocarbon laboratory of Adam Mickiewicz University, Poland. In addition, 30 freeze-dried samples per core at 0.25 or 0.5 cm intervals between 0 and 15 cm were analysed for 210Pb/137Cs at the Liverpool University Environmental Radioactivity Laboratory. In this project, we analyse pollen and sedaDNA (Liu et al., 2020; doi:10.5061/dryad.69p8cz900) from three lake sediment cores from the Omoloy region in north-eastern Siberia (northern Yakutia), which are currently surrounded by different vegetation types ranging from typical tundra to open larch forest. First, our aim is to compare sedaDNA with the pollen data to see whether both methods track the same pattern with respect to compositional changes and diversity changes across the northern Russian treeline zone or are complementary to each other. Second, we reconstruct the mid- to late-Holocene changes of vegetation composition along a north–south transect. Third, we use the sedaDNA data to reconstruct variations in species richness and relate this to vegetation and climate change.
    Keywords: AWI_Envi; dating; Lake Omoloy; mid-holocene; north-eastern Siberia; Polar Terrestrial Environmental Systems @ AWI; Pollen
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 30
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    REVEALS reconstruction of past vegetation cover, modern pollen and current vegetation data from Namibia (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: Understanding the resilience of African savannas to global change requires quantitative information on long-term vegetation dynamics. Here we present a reconstruction of past vegetation cover of the northern Namibian savanna obtained after applying the REVEALS model to fossil pollen data from Lake Otjikoto. We also present modern pollen and vegetation data used to calculate pollen productivity estimates for the major Namibian savanna taxa Acacia (Senegalia, Vachellia), Combretaceae, Dichrostachys, Grewia and Poaceae. Data were collected at 10 sites along a rainfall gradient in north central Namibia. Modern pollen was extracted from soil samples collected from plots at the different sites. Vegetation data were extracted from satellite images covering a 1.5 km radius from the plots where pollen was collected. The mean cover of the studied taxa was calculated by 100 m rings.
    Keywords: AWI_Envi; modern pollen; Polar Terrestrial Environmental Systems @ AWI; Pollen productivity estimate; REVEALS; Vegetation Mapping
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 31
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    High-resolution biomarker isotope and geochemical data for the ~4.2 ka sediment core from Lake Khar Nuur, Mongolian Altai (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-17
    Description: The Late Holocene is a substantial cultural and economic transition in the eastern Eurasian Steppe and Altai Region, but paleoclimate conditions during this time remain unclear. Therefore, we established a high-resolution paleoclimate record from Lake Khar Nuur in the Mongolian Altai, spanning the last 4200 years. Lake Khar Nuur is a high-altitude lake with a small catchment located at 2,486 m a.s.l. (48°37'22.9"N, 88°56'42.5"E). We recovered the sediment core (that we abbreviate KN18) from the deepest part of the lake (49.4 m) in July 2018 using an Uwitec gravity corer. Within the sediment core KN18, a wide array of lake sediment proxies was measured. While total organic carbon (TOC), total nitrogen, bulk δ^13^C~TOC~, δ^15^N and biogenic silica were measured in 2 cm resolution, the elemental composition (log (Ca/Ti) ratio) was measured in 0.5 cm resolution. Additionally, compound-specific hydrogen isotopic composition of _n_-alkanes was measured in 1 cm resolution.
    Keywords: Altai region; compound-specific biomarker isotopes; lake sediments; Late Holocene; Paleoclimate
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 32
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    Zoobenthos and sediments time series at List Reede, Sylt, Germany, 2003 to 2019 (2022)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: A shallow subtidal area in the northern Wadden Sea was monitored over 17 years for sediment parameters and macrobenthic fauna using stratified random sampling of a grid of 50 sampling positions. Samples were collected with a Reineck-type box-corer of 0.02 m² surface area, always during preceeded high tide. Granulometric sediment composition was analysed from a sub-sample of each box-core using a diffraction laser particle-size analyser. Macrobenthos (sieved through 1 mm square meshes and fixed in buffered formalin solution) was counted, identified to species level, and the size of hard-shelled individuals measured. The amount of shell detritus was quantified as wet-weight in the benthos samples. From 2003 to 2007 sampling was approximatively monthly and from 2008 to 2013 seasonally. When a new ship with larger drought was put into operation, the number of sampling sites needed to be reduced to 33 from 2014 onwards and sampling frequency was only once per year in autumn.
    Keywords: AWI_Coast; Coastal Ecology @ AWI; Macrobenthos; sediment analysis; Time-Series Data; Wadden Sea
    Type: Dataset
    Format: application/zip, 34 datasets
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  • 33
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    Seasonal diel pH, dissolved inorganic carbon, total alkalinity and partial pressure of CO2 data in the seagrass meadows of the inner lagoon and northern shore of Dongsha Island during the 2016–2019 study period (Table 3) (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide, partial pressure; CO2; DATE/TIME; Dongsha_Island_IL; Dongsha_Island_NS; Dongsha Island; Dongsha Island, China; Event label; IL; NS; Ocean acidification; pH; Seagrass
    Type: Dataset
    Format: text/tab-separated-values, 696 data points
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  • 34
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    Soil properties considering pH-values, total nitrogen and carbon content of soil samples, and soil type determination based on sand, silt, clay composition at the Hordorf (Central Germany) groundtruthing sites (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: The data set contains the results of laboratory examination of 13 soil samples taken at the ground truthing reference sites during the flight campaign.
    Keywords: airborne; Clay; drought; evapotranspiration; Event label; Groundtruthing; HAND; heatwave; Modular Observation Solutions for Earth Systems; MOSES; MOSES_beets; MOSES_CV01; MOSES_CV02; MOSES_DIAG_00-99; MOSES_early_potatoes_B; MOSES_Kartoffel; MOSES_Kartoffel_frueh; MOSES_potatoes_A; MOSES_REF_Boden; MOSES_Ruebe; MOSES_S02; MOSES_S04; MOSES_S05; MOSES_S06; MOSES_S09; MOSES_S10; MOSES_soil_reference_site; Nitrogen, soil; Organic carbon, soil; pH; remote sensing; Sample ID; Sampling by hand; Sand; Silt; Site; Soil Moisture; soil properties; Soil type
    Type: Dataset
    Format: text/tab-separated-values, 117 data points
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  • 35
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    Soil characteristics of Alpine European larch and Swiss pine forests in the LTSER area “Val Mazia/Matschertal”, South Tyrol (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Here we present soil characteristics from Alpine European larch and Swiss pine forests, as well as mixed forests. The forests are located in the LTSER area "Val Mazia/Matschertal" in the Vinschgau Valley, South Tyrol, Italy. Each three replicates from each forest type (larch, pine, and mixed) were sampled in late summer 2017.
    Keywords: Alpine forests; Calculated, see reference(s); Carbon/Nitrogen ratio; DEPTH, soil; Elevation of event; Event label; Exposition; Forest composition; HydroSenseII (Campbell Scientific, Logan, Utah); Inclination; L100_1; L100_2; L100_3; Larch; Latitude of event; Layer thickness; Longitude of event; LTER Italy; LZ50_1; LZ50_2; LZ50_3; Moisture; MULT; Multiple investigations; Organic content; pH; pH-multimeter (HI2020 edge, Hanna Instruments, Woonsocket, Rhode Island); Sample ID; soil macro-invertebrates; South Tyrol, Italy; Swiss pine; Z100_1; Z100_2; Z100_3
    Type: Dataset
    Format: text/tab-separated-values, 243 data points
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  • 36
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    In situ time series of oxygen in shallow salt marsh tidal ponds (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DATE/TIME; MARUM; Massachusetts, United States of America; Microoptode; Oxygen; pH; Plum_Island_Estuary; profiles; salt marsh; tidal pond
    Type: Dataset
    Format: text/tab-separated-values, 2741 data points
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  • 37
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    In situ time series of pH in shallow salt marsh tidal ponds (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DATE/TIME; MARUM; Massachusetts, United States of America; Microoptode; Oxygen; pH; Plum_Island_Estuary; profiles; salt marsh; tidal pond
    Type: Dataset
    Format: text/tab-separated-values, 2691 data points
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  • 38
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    In situ time series of photosynthetically active radiation (PAR) in shallow salt marsh tidal ponds (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DATE/TIME; MARUM; Massachusetts, United States of America; Microoptode; Oxygen; pH; Plum_Island_Estuary; profiles; Radiation, photosynthetically active; salt marsh; tidal pond
    Type: Dataset
    Format: text/tab-separated-values, 105 data points
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  • 39
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    In situ time series of temperature in shallow salt marsh tidal ponds (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DATE/TIME; MARUM; Massachusetts, United States of America; Microoptode; Oxygen; pH; Plum_Island_Estuary; profiles; salt marsh; Temperature, water; tidal pond
    Type: Dataset
    Format: text/tab-separated-values, 1426 data points
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  • 40
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    In situ time series of salinity in shallow salt marsh tidal ponds (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DATE/TIME; MARUM; Massachusetts, United States of America; Microoptode; Oxygen; pH; Plum_Island_Estuary; profiles; Salinity; salt marsh; tidal pond
    Type: Dataset
    Format: text/tab-separated-values, 3 data points
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  • 41
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    Oxygen profiles across the sediment-water interface in three different habitats in salt marshes (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Center for Marine Environmental Sciences; CO2; DEPTH, water; Event label; Great_Sippewissett_marsh; Habitat; MARUM; Massachusetts, United States of America; Michigan, United States; Oxygen; Parker_River; pH; Plum_Island_Estuary_marshes; profiles; salt marsh; tidal pond; Vegetation type
    Type: Dataset
    Format: text/tab-separated-values, 2144 data points
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  • 42
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    Culture seawater properties and Clathromorphum compactum skeletal analyses (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Barium/Calcium ratio; Carbon dioxide, partial pressure; Growth rate per area; Identification; Linear extension; Lithium/Calcium ratio; Magnesium/Calcium ratio; Magnesium/Lithium ratio; pH; pH, standard deviation; Salinity; Species; Temperature, water; Temperature, water, standard deviation; δ11B, borate; δ11B, carbonate; δ11B, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 708 data points
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  • 43
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    Water-soluble salts in the syngenetic permafrost deposits of Late- Pleistocene yedoma from Ayon Island (2020)
    PANGAEA
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    Publication Date: 2023-03-14
    Keywords: 337-YuV; ALTITUDE; Ayon Island; Bicarbonate ion; Calcium ion; Calculated; Chaun-Chukotka; Chloride ion; Chukotka, Russia; Deposit type; deuterium; heavy oxygen; Holocene; ice wedge; Late Pleistocene; Magnesium ion; pH; Sample ID; Sodium and potassium ions; Stable isotope; Sulfate ion; Total dissolved solids
    Type: Dataset
    Format: text/tab-separated-values, 170 data points
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  • 44
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    Water-soluble salts in the syngenetic ice wedges of Late-Pleistocene yedoma and in the modern ices and the water reservoirs from Ayon Island (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: 337-YuV; ALTITUDE; Ayon Island; Bicarbonate ion; Calcium; Chaun-Chukotka; Chloride; Chukotka, Russia; deuterium; Event label; heavy oxygen; Holocene; ice wedge; Late Pleistocene; Latitude of event; Longitude of event; Magnesium; pH; Sample comment; Sample ID; Sodium and potassium ions; Stable isotope; Sulfate; Titration; Total dissolved solids
    Type: Dataset
    Format: text/tab-separated-values, 435 data points
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  • 45
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    Alkalinity measurements of a loess column experiment in the laboratory under pCO2 atmospheric conditions (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: This dataset includes alkalinity measurements of a loess weathering column experiment, which was conducted under laboratory conditions with atmospheric pCO2.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; DATE/TIME; Duration, number of days; Paleo Modelling; PalMod; pH; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 179 data points
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  • 46
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    Alkalinity measurements of a loess column experiment in the laboratory under pCO2 saturated conditions (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: This dataset includes alkalinity measurements of a loess weathering column experiment, which was conducted under laboratory conditions with saturated pCO2.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; DATE/TIME; Duration, number of days; Paleo Modelling; PalMod; pH; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 175 data points
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  • 47
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    Alkalinity in porewater profile of sediment core BOX_1BC04 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_1BC04; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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  • 48
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    Alkalinity in porewater profile of sediment core BOX_1GL01 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_1GL01; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 99 data points
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  • 49
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    Alkalinity in porewater profile of sediment core BOX_1GL02 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_1GL02; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 94 data points
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  • 50
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    Alkalinity in porewater profile of sediment core BOX_1GL03 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_1GL03; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
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  • 51
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    Alkalinity in porewater profile of sediment core BOX_1GL04 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_1GL04; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 74 data points
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  • 52
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    Alkalinity in porewater profile of sediment core BOX_2BC05 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_2BC05; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 64 data points
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  • 53
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    Alkalinity in porewater profile of sediment core BOX_2BC04 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_2BC04; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 53 data points
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  • 54
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    Alkalinity in porewater profile of sediment core BOX_2GL02 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_2GL02; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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  • 55
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    Alkalinity in porewater profile of sediment core BOX_2GL01 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_2GL01; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 91 data points
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    DATA PANGAEA
  • 56
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    Alkalinity in porewater profile of sediment core BOX_2GL03 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_2GL03; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 81 data points
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    DATA PANGAEA
  • 57
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    Alkalinity in porewater profile of sediment core BOX_3BC01 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3BC01; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 56 data points
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    DATA PANGAEA
  • 58
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    Alkalinity in porewater profile of sediment core BOX_3BC02 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3BC02; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 59 data points
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    DATA PANGAEA
  • 59
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    Alkalinity in porewater profile of sediment core BOX_3BC04 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3BC04; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 19 data points
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    DATA PANGAEA
  • 60
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    Alkalinity in porewater profile of sediment core BOX_3BC03 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3BC03; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 14 data points
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    DATA PANGAEA
  • 61
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    Alkalinity in porewater profile of sediment core BOX_3BC05 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3BC05; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 34 data points
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    DATA PANGAEA
  • 62
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    Alkalinity in porewater profile of sediment core BOX_3GL01 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3GL01; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 67 data points
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    DATA PANGAEA
  • 63
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    Alkalinity in porewater profile of sediment core BOX_3GL02 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3GL02; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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  • 64
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    Alkalinity in porewater profile of sediment core BOX_3GL03 from the Gulf of Cádiz (North East Atlantic) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Alkalinity, total; BC; BOX_3GL03; Box corer; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; EMIGAS; EMIGAS-I; Greenhouse gas emission zones in coastal systems: influence of coastal runoff and benthic metabolism; Gulf of Cadiz; Gulf of Cádiz, Atlantic Ocean; Mytilus; North East Atlantic; pH; porewater; Porosity, fractional; Potentiometric; Salinity; sediment; Sediment porosity, determined by water loss after drying to constant temperature; Temperature, water; Titration potentiometric, 794 Basic Titrino (Metrohm); total alkalinity (TA)
    Type: Dataset
    Format: text/tab-separated-values, 69 data points
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    DATA PANGAEA
  • 65
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    pH analyis of porewater from sediment cores of the POLARSTERN cruise PS92 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Arctic Ocean; ARK-XXIX/1, TRANSSIZ; BC; Box corer; DEPTH, sediment/rock; Event label; Multicorer with television; pH; pH, Electrode; Polarstern; PS92; PS92/019-19; PS92/027-15; PS92/031-13; PS92/039-5; PS92/040-1; PS92/043-20; PS92/046-15; PS92/047-20; PS92/056-5; Reactive iron and manganese; TVMUC
    Type: Dataset
    Format: text/tab-separated-values, 146 data points
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  • 66
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    Water column chemistry of station T3 and T5 from LowpHOX-2 cruise (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Carbon, inorganic, dissolved; Carbon, organic, particulate; Carbon/Nitrogen ratio; Carbon dioxide, partial pressure; Chlorophyll a; CTD; Date/Time of event; DEPTH, water; Environment; Event label; Latitude of event; Longitude of event; LowpHOX-II; Lowphox-II_T3; Lowphox-II_T5; Nitrate; Nitrite; Nitrogen, organic, particulate; Oxygen, dissolved; pH; Phosphate; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 221 data points
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  • 67
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    Total dissolved solids and major ions in soils of the first marine terrace of the Belyy Island (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Belyy_Island; Belyy Island; Bicarbonate ion; Calcium; Chloride; cryopegs; DEPTH, sediment/rock; highly mineralized ice wedges; Magnesium; pH; Pollen; polygonal landscapes; Sample ID; Sample type; Sodium and potassium ions; soil temperature changes; spores; Sulfate; Total dissolved solids; Yamal Peninsula, northwestern Siberia
    Type: Dataset
    Format: text/tab-separated-values, 144 data points
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    DATA PANGAEA
  • 68
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    Total dissolved solids and major ions in sediments of the Tambey River floodplain (well 195-YuV) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bicarbonate ion; Calcium cation; Chloride/sulfate ratio; Chloride anion; DEPTH, sediment/rock; geochemical conditions; Ice wedges; Magnesium cation; pH; Pollen; polygonal landscapes; Sample ID; Sodium and potassium ions; soil temperature; Soil type; spores; Sulfate anion; Tambey_River; Tambey River; Total dissolved solids; Yamal-Nenets, Russia; Yamal Peninsula
    Type: Dataset
    Format: text/tab-separated-values, 66 data points
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  • 69
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    Content and composition of water-soluble salts in ice-wedge ice of the first marine terrace of Belyy Island (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Belyy_Island; Belyy Island; Bicarbonate ion; Calcium; Chloride; cryopegs; DEPTH, sediment/rock; highly mineralized ice wedges; Iron; Magnesium; pH; Pollen; polygonal landscapes; Sample ID; Sodium and potassium ions; soil temperature changes; spores; Sulfate; Total dissolved solids; Yamal Peninsula, northwestern Siberia
    Type: Dataset
    Format: text/tab-separated-values, 238 data points
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  • 70
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    Total dissolved solids and major ions in ice-wedge ice of the laida of Belyy Island (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Belyy_Island; Belyy Island; Bicarbonate ion; Calcium; Chloride; cryopegs; DEPTH, sediment/rock; highly mineralized ice wedges; Iron; Magnesium; pH; Pollen; polygonal landscapes; Sample ID; Sodium and potassium ions; soil temperature changes; spores; Sulfate; Total dissolved solids; Yamal Peninsula, northwestern Siberia
    Type: Dataset
    Format: text/tab-separated-values, 85 data points
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  • 71
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    Total dissolved solids and major ions in ice wedge ice of the cross-section of the Tambey river floodplain (wells 193-198-YuV) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bicarbonate ion; Calcium; Chloride; Chloride/sulfate ratio; DEPTH, sediment/rock; Distance, relative; geochemical conditions; Ice wedges; Iron; Magnesium; pH; Pollen; polygonal landscapes; Sample comment; Sample ID; Sodium and potassium ions; soil temperature; spores; Sulfate; Tambey_River; Tambey River; Total dissolved solids; Yamal-Nenets, Russia; Yamal Peninsula
    Type: Dataset
    Format: text/tab-separated-values, 345 data points
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  • 72
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    Total dissolved solids and major ions in modern marine sediments on the Belyy Island (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Belyy_Island; Belyy Island; Bicarbonate ion; Calcium; Calcium ion; Chloride; Chloride ion; cryopegs; highly mineralized ice wedges; Location; Magnesium; Magnesium ion; pH; Pollen; polygonal landscapes; Sample ID; Sample type; Sodium and potassium ions; soil temperature changes; spores; Sulfate; Sulfate ion; Total dissolved solids; Yamal Peninsula, northwestern Siberia
    Type: Dataset
    Format: text/tab-separated-values, 34 data points
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  • 73
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    Physicochemical conditions of control and acidified tanks for culture of flat tree oysters, Isognomon alatus (Gmelin, 1791) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: acidification; Bermuda, Atlantic Ocean; Date; flat tree oyster; Handheld Multiparameter Instrument, YSI Incorporated, YSI 556 MPS; Isognomon alatus; Knife; KNIFE; manipulated CO2; MulletBay; Oxygen, dissolved; pH; Salinity; seawater flow through system; Tank number; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 9548 data points
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  • 74
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    Shell morphometrics of Isognomon alatus in control (pH = 8.1) and acidified tanks (pH = 7.8) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: acidified seawater; Bermuda, Atlantic Ocean; bivalves growth; Buoyant mass; Date; Height; Knife; KNIFE; Length; Measured using callipers; MulletBay; Oysters; pH; Shell morphometrics; Tank number; Thickness; Weighted
    Type: Dataset
    Format: text/tab-separated-values, 750 data points
    Location Call Number Expected Availability
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  • 75
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    Geochemical profiles of water samples from alkaline springs, Samail Ophiolite, Oman (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: alkaline springs; Alkalinity, total; Barium; Calcium; Carbon, inorganic, dissolved; carbonates; Chloride ion; Conductivity, electrolytic; Date/Time of event; Event label; HAND; HI9813-5; ICP-OES, Varian Vista Pro; Ion chromatography (Metrohm 882 Compact IC plus); ITN-ABYSS; Latitude of event; Location; Longitude of event; Magnesium; Multiparameter probe (HI9813-5, Hanna Instruments, Woonsocket, Rhode Island); OM15-1; OM15-11; OM15-12; OM15-2; OM15-3; OM15-4; OM15-5; OM15-6; OM15-8; OM15-9; OM15K-1; OM15K-10; OM15K-11; OM15K-13; OM15K-14; OM15K-16; OM15K-18; OM15K-19; OM15K-2; OM15K-20; OM15K-21; OM15K-22; OM15K-23; OM15K-3; OM15K-4; OM15K-5; OM15K-6; OM15K-7; OM15K-8; OM15K-9; Oman; pH; Potassium; PROMETHEUS; Sample ID; Sampling by hand; Serpentinization; Silicon; Sodium; Strontium; Sulfate; Temperature, water; Water description
    Type: Dataset
    Format: text/tab-separated-values, 510 data points
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  • 76
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    Physicochemical conditions in response to tidal regime during the field experiment in Mangrove Bay, Ferry Reach, Bermuda (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bermuda; Bermuda, Atlantic Ocean; coastal estuarine; Date; Environmental variables; Event label; EXP; Experiment; Handheld Multiparameter Instrument, YSI Incorporated, YSI 556 MPS; Mangrove Bay; MangroveBay_A; MangroveBay_B; MangroveBay_C; Oxygen, dissolved; pH; pH variation; Salinity; Station A; Station B; Station C; Station label; Temperature, water; Tidal regime; Tide
    Type: Dataset
    Format: text/tab-separated-values, 480 data points
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  • 77
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    Water qaulity measured by Australian Government agencies (1960-1999) (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Conductivity, electrical; DATE/TIME; endorheic lake; hydrologic changes; Lake_George; Lake George, NSW, Australia; Landsat; long record; pH; remote sensing; Sentinel; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 1029 data points
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  • 78
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    In-situ light measurements of oxygen, pH and sulfide in a microbial mat from the Atacama Desert, Chile (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: anoxia; arsenic; Atacama Desert; Chile; DEPTH, sediment/rock; Laguna-La-Brava; lithification; Microbial mat; MULT; Multiple investigations; Needle-encased glass electrodes with PA-2000 picoammeter (Unisense); Oxygen; pH; Sulfide; Sulfur
    Type: Dataset
    Format: text/tab-separated-values, 246 data points
    Location Call Number Expected Availability
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  • 79
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    In-situ dark measurements of oxygen, pH and sulfide in a microbial mat from the Atacama Desert, Chile (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: anoxia; arsenic; Atacama Desert; Chile; DEPTH, sediment/rock; Laguna-La-Brava; lithification; Microbial mat; MULT; Multiple investigations; Needle-encased glass electrodes with PA-2000 picoammeter (Unisense); Oxygen; pH; Sulfide; Sulfur
    Type: Dataset
    Format: text/tab-separated-values, 234 data points
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  • 80
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    Bulk density of sediment core LR398 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Lake level; land use change; Livingstone piston corer; Llanos de Moxos; LPC; LR398; Multi-Sensor Core Logger (MSCL-XYZ), GEOTEK; Shallow lake
    Type: Dataset
    Format: text/tab-separated-values, 447 data points
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  • 81
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    Bulk density of sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Density, dry bulk; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GCUWI; Gravity corer, UWITEC; Lake level; land use change; Llanos de Moxos; LR400; Multi-Sensor Core Logger (MSCL-XYZ), GEOTEK; Shallow lake
    Type: Dataset
    Format: text/tab-separated-values, 372 data points
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    DATA PANGAEA
  • 82
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    Carbon and Nitrogen concentrations in sediment core LR398 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; Carbon, total; Carbon/Nitrogen ratio; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element analyser CNS, vario EL Cube; Isotope Ratio Mass Spectrometer, IsoPrime; Lake level; land use change; Livingstone piston corer; Llanos de Moxos; LPC; LR398; Nitrogen, total; Shallow lake; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 358 data points
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  • 83
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    Carbon and Nitrogen concentrations in sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; Carbon, total; Carbon/Nitrogen ratio; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element analyser CNS, vario EL Cube; GCUWI; Gravity corer, UWITEC; Lake level; land use change; Llanos de Moxos; LR400; Nitrogen, total; Shallow lake
    Type: Dataset
    Format: text/tab-separated-values, 625 data points
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  • 84
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    Grain size analysis of sediment core LR398 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Grain size, Mastersizer 2000, Malvern Instrument Inc., Corg free; Grain size, mean; Lake level; land use change; Livingstone piston corer; Llanos de Moxos; LPC; LR398; Median, grain size; Mode, grain size; Shallow lake; Size fraction 0.002-0.00002 mm; Size fraction 0.063-0.002 mm, silt, mud; Size fraction 2.000-0.063 mm, sand
    Type: Dataset
    Format: text/tab-separated-values, 456 data points
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  • 85
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    Grain size analysis of sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GCUWI; Grain size, Mastersizer 2000, Malvern Instrument Inc., Corg free; Grain size, mean; Gravity corer, UWITEC; Lake level; land use change; Llanos de Moxos; LR400; Median, grain size; Mode, grain size; Shallow lake; Size fraction 0.002-0.00002 mm; Size fraction 0.063-0.002 mm, silt, mud; Size fraction 2.000-0.063 mm, sand
    Type: Dataset
    Format: text/tab-separated-values, 1000 data points
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    DATA PANGAEA
  • 86
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    Water content of sediment core LR398 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Lake level; land use change; Livingstone piston corer; Llanos de Moxos; LPC; LR398; Shallow lake; Water content, wet mass; Weight loss after drying
    Type: Dataset
    Format: text/tab-separated-values, 447 data points
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  • 87
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    Element analysis of sediment core LR398 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Aluminium; Argon; Barium; Bolivian Amazon; Calcium; Chromium; climate; Copper; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elements, total; Iron; Lake level; land use change; Livingstone piston corer; Llanos de Moxos; LPC; LR398; Manganese; Mean squared error; Neodymium; Nickel; Potassium; Rubidium; Samarium; Shallow lake; Silicon; Strontium; Terbium; Thulium; Titanium; X-ray fluorescence ITRAX core scanner, Mo-tube 35kV 35mA 10s; Yttrium; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 19604 data points
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  • 88
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    Water content of sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Bolivian Amazon; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GCUWI; Gravity corer, UWITEC; Lake level; land use change; Llanos de Moxos; LR400; Shallow lake; Water content, wet mass; Weight loss after drying
    Type: Dataset
    Format: text/tab-separated-values, 372 data points
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    DATA PANGAEA
  • 89
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    Element analysis of sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Aluminium; Argon; Barium; Bolivian Amazon; Calcium; Chromium; climate; Copper; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Elements, total; GCUWI; Gravity corer, UWITEC; Iron; Lake level; land use change; Llanos de Moxos; LR400; Manganese; Mean squared error; Neodymium; Nickel; Potassium; Rubidium; Samarium; Shallow lake; Silicon; Strontium; Terbium; Thulium; Titanium; X-ray fluorescence ITRAX core scanner, Mo-tube 35kV 35mA 10s; Yttrium; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 15834 data points
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    DATA PANGAEA
  • 90
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    Biogenic Silica concentration in sediment core LR400 (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Aluminium; Bolivian Amazon; climate; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; GCUWI; Gravity corer, UWITEC; ICP-OES; Iron; Lake level; land use change; Llanos de Moxos; LR400; Sample ID; Shallow lake; Silicon
    Type: Dataset
    Format: text/tab-separated-values, 216 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 91
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    Unknown
    Salinity, pH, sea water temperature, pCO2, Omega Aragonite, and DIC determination in the Gulf of Papagayo (Culebra Bay), Costa Rica (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: aragonite saturation state; Aragonite saturation state; Calculated based on the ƒCO2 and the pH; Carbon, inorganic, dissolved; Carbon dioxide, partial pressure; Corals; Costa Rica; DATE/TIME; DEPTH, water; dissolved oxygen; Gulf of Papagayo; Gulf of Papagayo, Culebra Bay, Costa Rica; Leibniz Centre for Tropical Marine Research; Marina_Papagayo; Multiprobe, WTW 340i; Orion ROSS electrode and an Orion StarTM; Oxygen; pCO2; pH; Salinity; Sea surface temperature; SUNDANS; Surface UNderway carbon Dioxide partial pressure ANalySer; Time in days; Upwelling; WTW Cond 3310; ZMT
    Type: Dataset
    Format: text/tab-separated-values, 504 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 92
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    Unknown
    Trait measurements of Sphagnum moss from northern peatlands (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: B1; B2; B3; B4; B5; B6; B7; B8; bog; Capitulum, dry weight; Capitulum, water content; Capitulum, width; Capitulum density; Carbon; Carbon/Nitrogen ratio; Elemental analyzer CHNS-O (EA1110); Elevation of event; Event label; Fascicle density; fen; functional plant trait; HL_HRS; HL_IS; HL_KAL; HL_KLA; HL_KS; HL_LA; HL_TE; Latitude of event; Longitude of event; Mire; mire succession; Moisture index; Nitrogen; Northern_peatlands_B1; Northern_peatlands_B2; Northern_peatlands_B3; Northern_peatlands_B4; Northern_peatlands_B5; Northern_peatlands_B6; Northern_peatlands_B7; Northern_peatlands_B8; Northern_peatlands_HL_HRS; Northern_peatlands_HL_IS; Northern_peatlands_HL_KAL; Northern_peatlands_HL_KLA; Northern_peatlands_HL_KS; Northern_peatlands_HL_LA; Northern_peatlands_HL_TE; Northern_peatlands_S1; Northern_peatlands_S13; Northern_peatlands_S2; Northern_peatlands_S3; Northern_peatlands_S31; Northern_peatlands_S33; Northern_peatlands_S4; Northern_peatlands_S41; Northern_peatlands_S42; Northern_peatlands_S5; Northern_peatlands_S51; Northern_peatlands_S53; Northern_peatlands_S6; Northern_peatlands_u10; Northern_peatlands_u13; Northern_peatlands_u14; Northern_peatlands_u16; Northern_peatlands_u18; Northern_peatlands_u2; Northern_peatlands_u24; Northern_peatlands_u26; Northern_peatlands_u29; Northern_peatlands_u33; Northern_peatlands_u43; Northern_peatlands_u52; Northern_peatlands_u62; Northern_peatlands_u65; Northern_peatlands_u70; Optional event label; Peatland; Peat thickness; pH; S1; S13; S2; S3; S31; S33; S4; S41; S42; S5; S51; S53; S6; Species; u10; u13; u14; u16; u18; u2; u24; u26; u29; u33; u43; u52; u62; u65; u70
    Type: Dataset
    Format: text/tab-separated-values, 4199 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 93
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    Vascular trait measurements from northern peatlands (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: B1; B2; B3; B4; B5; B6; B7; B8; bog; Carbon; Carbon/Nitrogen ratio; Elemental analyzer CHNS-O (EA1110); Elevation of event; Event label; fen; functional plant trait; HL_HRS; HL_IS; HL_KAL; HL_KLA; HL_KS; HL_LA; HL_TE; Latitude of event; Leave size; Longitude of event; Measured using software ImageJ; Mire; mire succession; Moisture index; Nitrogen; Northern_peatlands_B1; Northern_peatlands_B2; Northern_peatlands_B3; Northern_peatlands_B4; Northern_peatlands_B5; Northern_peatlands_B6; Northern_peatlands_B7; Northern_peatlands_B8; Northern_peatlands_HL_HRS; Northern_peatlands_HL_IS; Northern_peatlands_HL_KAL; Northern_peatlands_HL_KLA; Northern_peatlands_HL_KS; Northern_peatlands_HL_LA; Northern_peatlands_HL_TE; Northern_peatlands_S1; Northern_peatlands_S11; Northern_peatlands_S2; Northern_peatlands_S3; Northern_peatlands_S31; Northern_peatlands_S33; Northern_peatlands_S4; Northern_peatlands_S41; Northern_peatlands_S42; Northern_peatlands_S5; Northern_peatlands_S51; Northern_peatlands_S53; Northern_peatlands_S6; Northern_peatlands_u10; Northern_peatlands_u13; Northern_peatlands_u14; Northern_peatlands_u16; Northern_peatlands_u18; Northern_peatlands_u2; Northern_peatlands_u24; Northern_peatlands_u26; Northern_peatlands_u29; Northern_peatlands_u33; Northern_peatlands_u43; Northern_peatlands_u52; Northern_peatlands_u62; Northern_peatlands_u65; Northern_peatlands_u70; Optional event label; Peatland; Peat thickness; pH; Plant height; S1; S11; S2; S3; S31; S33; S4; S41; S42; S5; S51; S53; S6; Species; Specific leaf area; u10; u13; u14; u16; u18; u2; u24; u26; u29; u33; u43; u52; u62; u65; u70
    Type: Dataset
    Format: text/tab-separated-values, 19294 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 94
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    Fractional abundances and concentrations of brGMGTs in SPM from Lake Chala (Table S1) (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Keywords: Africa; Branched glycerol monoalkyl glycerol tetraethers; Branched glycerol monoalkyl glycerol tetraethers, H1020a; Branched glycerol monoalkyl glycerol tetraethers, H1020a, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1020b; Branched glycerol monoalkyl glycerol tetraethers, H1020b, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1020c; Branched glycerol monoalkyl glycerol tetraethers, H1020c, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1034a; Branched glycerol monoalkyl glycerol tetraethers, H1034a, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1034b; Branched glycerol monoalkyl glycerol tetraethers, H1034b, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1034c; Branched glycerol monoalkyl glycerol tetraethers, H1034c, fractional abundance; Branched glycerol monoalkyl glycerol tetraethers, H1048; Branched glycerol monoalkyl glycerol tetraethers, H1048, fractional abundance; brGMGTs; Conductivity, electrical; DATE/TIME; H-brGDGTs; Lake_Chala; Lake Chala; Lake Chala, East Africa; Month; MULT; Multiple investigations; Oxygen, dissolved; pH; Sample ID; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 2629 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 95
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    Unknown
    Freshwater cultured pearls from Kentucky Lake - Table S2 (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: This Dataset serves as supplementary table S2 for our publication (Farfan et al, 2021). It contains all of the mineralogical, oxygen isotope, and Kentucky Lake environmental data compiled for the study, set into nacre-transect space defined by the SIMS-pits taken during oxygen isotope analyses.
    Keywords: Alkalinity, total; Alkalinity, total, standard deviation; Ammonia; Ammonia, standard deviation; aragonite; Chlorine; Chlorine, standard deviation; Conductivity, electrolytic; Conductivity, standard deviation; DATE/TIME; Depth, error; Depth with 1% of photosynthetic active radiation; Distance; Event label; Fractionation factor; Fractionation factor, error; Full width at half maximum; KentuckyLakePearl_1; KentuckyLakePearl_2; KentuckyLakePearl_3; LAKE; Light intensity; Light intensity, standard deviation; mineralogy; Nitrate and Nitrite; Nitrate and Nitrite, standard deviation; Oxidation reduction (RedOx) potential; Oxidation reduction (RedOx) potential, standard deviation; Oxygen, dissolved; Oxygen, dissolved, standard deviation; oxygen isotope; Peak centre; Peak height; pearls; pH; pH, standard deviation; Raman spectrometry; Raman spectroscopy; Ratio; Sample ID; Sampling lake; Secondary ion mass spectrometry (SIMS); Silicon dioxide; Silicon dioxide, standard deviation; Standard deviation; Sulfate; Sulfate, standard deviation; Temperature, standard deviation; Temperature, water; Thickness; Thickness, standard error; Transect; Turbidity, standard deviation; Turbidity (Nephelometric turbidity unit); δ18O; δ18O, aragonite; δ18O, standard error
    Type: Dataset
    Format: text/tab-separated-values, 29870 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 96
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    Oceanographic parameters for the sample stations of Ludwig Prandtl cruise LP20160725 (2022)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Offshore wind energy is a steadily growing sector contributing to the worldwide energy production. The impact of these offshore constructions on the marine environment, however, remains unclear in many aspects. In fact, little is known about potential emissions from corrosion protection systems such as organic coatings or galvanic anodes composed of Al and Zn alloys, used to protect offshore structures. In order to assess potential chemical emissions from offshore wind farms and their impact on the marine environment water and sediment samples were taken in the surroundings of offshore wind farms of the German Bight between 25.07.2016 and 02.08.2016. At every sampling station oceanographic parameters were measured directly on board with respective probes of a multimeter covering pH, dissolved oxygen, temperature and conductivity.
    Keywords: Conductivity, electrical; Date/Time of event; Event label; Helmholtz-Zentrum Hereon; Hereon; Latitude of event; Longitude of event; LP20160725; LP20160725_Stat_1_2; LP20160725_Stat_10_2; LP20160725_Stat_11_3; LP20160725_Stat_12_3; LP20160725_Stat_13_3; LP20160725_Stat_14_2; LP20160725_Stat_15_3; LP20160725_Stat_16_3; LP20160725_Stat_17_2; LP20160725_Stat_18_3; LP20160725_Stat_19_3; LP20160725_Stat_2_2; LP20160725_Stat_20_3; LP20160725_Stat_21_3; LP20160725_Stat_22_3; LP20160725_Stat_23_2; LP20160725_Stat_24_3; LP20160725_Stat_25_2; LP20160725_Stat_26_3; LP20160725_Stat_27_3; LP20160725_Stat_28_3; LP20160725_Stat_29_3; LP20160725_Stat_3_3; LP20160725_Stat_30_3; LP20160725_Stat_31_3; LP20160725_Stat_32_3; LP20160725_Stat_33_3; LP20160725_Stat_34_3; LP20160725_Stat_35_3; LP20160725_Stat_36_3; LP20160725_Stat_37_3; LP20160725_Stat_38_3; LP20160725_Stat_39_3; LP20160725_Stat_4_2; LP20160725_Stat_40_3; LP20160725_Stat_41_3; LP20160725_Stat_42_3; LP20160725_Stat_43_3; LP20160725_Stat_44_3; LP20160725_Stat_45_3; LP20160725_Stat_46_3; LP20160725_Stat_47_3; LP20160725_Stat_48_3; LP20160725_Stat_49_3; LP20160725_Stat_5_2; LP20160725_Stat_50_3; LP20160725_Stat_51_3; LP20160725_Stat_52_3; LP20160725_Stat_53_3; LP20160725_Stat_54_3; LP20160725_Stat_55_3; LP20160725_Stat_56_2; LP20160725_Stat_57_2; LP20160725_Stat_6_3; LP20160725_Stat_7_3; LP20160725_Stat_8_3; LP20160725_Stat_9_3; Ludwig Prandtl; Multimeter; North Sea; Oxygen, dissolved; pH; S001; S002; S003; S004; S005; S006; S007; S008; S009; S010; S011; S012; S013; S014; S015; S016; S017; S018; S019; S020; S021; S022; S023; S024; S025; S026; S027; S028; S029; S030; S031; S032; S033; S034; S035; S036; S037; S038; S039; S040; S041; S042; S043; S044; S045; S046; S047; S048; S049; S050; S051; S052; S053; S054; S055; S056; Sample code/label; Station label; Temperature, water; Water sample; WS
    Type: Dataset
    Format: text/tab-separated-values, 342 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 97
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    Manganese and barium concentration data for water column samples collected during AL543 (2023)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Barium (Ba) isotopes are a promising new tracer for riverine freshwater input to the ocean and marine biogeochemical cycling. However, many processes that affect Ba cycling at continental margins have not yet been investigated with respect to Ba isotope fractionation. We present a comprehensive data set of Ba concentration and isotope data for water column, pore water and sediment samples from Kiel Bight, a seasonally stratified and hypoxic fjord in the southwestern Baltic Sea.
    Keywords: AL543; AL543_10-1; AL543_13-1; AL543_8-1; Alkor (1990); Baltic Sea; Barium; CTD/Rosette; CTD-RO; Depth, bathymetric; DEPTH, water; Event label; Manganese; Saturation index; The Little Belt
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 98
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    Unknown
    Barium isotope data for water column samples collected during AL543 (2023)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Barium (Ba) isotopes are a promising new tracer for riverine freshwater input to the ocean and marine biogeochemical cycling. However, many processes that affect Ba cycling at continental margins have not yet been investigated with respect to Ba isotope fractionation. We present a comprehensive data set of Ba concentration and isotope data for water column, pore water and sediment samples from Kiel Bight, a seasonally stratified and hypoxic fjord in the southwestern Baltic Sea.
    Keywords: AL543; AL543_10-1; AL543_13-1; AL543_8-1; Alkor (1990); Baltic Sea; Barium; CTD/Rosette; CTD-RO; DEPTH, water; Event label; Replicates; Standard deviation; The Little Belt; δ138Ba
    Type: Dataset
    Format: text/tab-separated-values, 68 data points
    Location Call Number Expected Availability
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  • 99
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    Unknown
    Additional pore water geochemical and barium isotope data for sediment cores collected during AL543 (2023)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Barium (Ba) isotopes are a promising new tracer for riverine freshwater input to the ocean and marine biogeochemical cycling. However, many processes that affect Ba cycling at continental margins have not yet been investigated with respect to Ba isotope fractionation. We present a comprehensive data set of Ba concentration and isotope data for water column, pore water and sediment samples from Kiel Bight, a seasonally stratified and hypoxic fjord in the southwestern Baltic Sea.
    Keywords: AL543; AL543_10-2; AL543_13-2; AL543_8-4; Alkor (1990); Baltic Sea; Barium; Comment; DEPTH, sediment/rock; Event label; Manganese; MIC; MiniCorer; Replicates; Saturation index; Standard deviation; Sulfate; The Little Belt; δ138Ba
    Type: Dataset
    Format: text/tab-separated-values, 271 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 100
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    Unknown
    Solid phase geochemical and barium isotope data for sediment cores collected during AL543 (2023)
    PANGAEA
    Details
    Publication Date: 2023-03-14
    Description: Barium (Ba) isotopes are a promising new tracer for riverine freshwater input to the ocean and marine biogeochemical cycling. However, many processes that affect Ba cycling at continental margins have not yet been investigated with respect to Ba isotope fractionation. We present a comprehensive data set of Ba concentration and isotope data for water column, pore water and sediment samples from Kiel Bight, a seasonally stratified and hypoxic fjord in the southwestern Baltic Sea.
    Keywords: AL543; AL543_10-2; AL543_13-2; AL543_8-4; Alkor (1990); Aluminium; Baltic Sea; Barium; Carbon, organic, total; Comment; DEPTH, sediment/rock; Event label; MIC; MiniCorer; Porosity; Replicates; Standard deviation; The Little Belt; Water content, wet mass; δ138Ba
    Type: Dataset
    Format: text/tab-separated-values, 282 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
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