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  • 2010-2014  (567,331)
  • 2005-2009  (25)
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  • 1
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    Unknown
    PANGAEA
    In:  Supplement to: Monien, Patrick; Schnetger, Bernhard; Brumsack, Hans-Jürgen; Hass, H Christian; Kuhn, Gerhard (2011): A geochemical record of late Holocene paleoenvironmental changes at King George Island (maritime Antarctica). Antarctic Science, 23(3), 255-267, https://doi.org/10.1017/S095410201100006X
    Publication Date: 2024-06-26
    Description: During RV Polarstern cruise ANT-XXIII/4 in 2006, a gravity core (PS69/335-2) and a giant box core (PS69/335-1) were retrieved from Maxwell Bay off King George Island (KGI). Comprehensive geochemical (bulk parameters, quantitative XRF, Inductively Coupled Plasma Mass Spectrometry) and radiometric dating analyses (14C, 210Pb) were performed on both cores. A comparison with geochemical data from local bedrock demonstrates a mostly detrital origin for the sediments, but also points to an overprint from changing bioproductivity in the overlying water column in addition to early diagenetic processes. Furthermore, ten tephra layers that were most probably derived from volcanic activity on Deception Island were identified. Variations in the vertical distribution of selected elements in Maxwell Bay sediments further indicate a shift in source rock provenance as a result of changing glacier extents during the past c. 1750 years that may be linked to the Little Ice Age and the Medieval Warm Period. Whereas no evidence for a significant increase in chemical weathering rates was found, 210Pb data revealed that mass accumulation rates in Maxwell Bay have almost tripled since the 1940s (0.66 g cm-2 yr-1 in AD 2006), which is probably linked to rapid glacier retreat in this region due to recent warming.
    Keywords: ANT-XXIII/4; GC; Giant box corer; GKG; Gravity corer; IMCOAST/IMCONet; Impact of climate induced glacier melt on marine coastal systems, Antarctica; Polarstern; Potter Cove, King George Island, Antarctic Peninsula; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS69; PS69/335-1; PS69/335-2; SPP1158
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2024-06-26
    Description: Porous seep-carbonates are exposed at mud volcanoes in the eastern Mediterranean Sea. The 13C-depleted aragonitic carbonates formed as a consequence of the anaerobic oxidation of methane in a shallow sub-surface environment. Besides the macroscopically visible cavernous fabric, extensive carbonate corrosion was revealed by detailed analysis. After erosion of the background sediments, the carbonates became exposed to oxygenated bottom waters that are periodically influenced by the release of methane and upward diffusion of hydrogen sulphide. We suggest that carbonate corrosion resulted from acidity locally produced by aerobic oxidation of methane and hydrogen sulphide in the otherwise, with respect to aragonite, oversaturated bottom waters. Although it remains to be tested whether the mechanisms of carbonate dissolution suggested herein are valid, this study reveals that a better estimate of the significance of corrosion is required to assess the amount of methane-derived carbon that is permanently fixed in seep-carbonates.
    Keywords: Amsterdam Mud Volcano; Center for Marine Environmental Sciences; GeoB11301-5; GeoB11301-6; GeoB11308-1; M70/3; Manipulator arm; MARUM; Meteor (1986); ROV_MA
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
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  • 3
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    Unknown
    PANGAEA
    In:  Supplement to: Rutgers van der Loeff, Michiel M; Cai, Pinghe; Stimac, Ingrid; Bracher, Astrid; Middag, Rob; Klunder, Maarten B; van Heuven, Steven (2011): 234Th in surface waters: distribution of particle export flux across the Antarctic Circumpolar Current and in the Weddell Sea during the GEOTRACES expedition ZERO and DRAKE. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2749-2766, https://doi.org/10.1016/j.dsr2.2011.02.004
    Publication Date: 2024-06-26
    Description: As part of the GEOTRACES Polarstern expedition ANT XXIV/3 (ZERO and DRAKE) we have measured the vertical distribution of 234Th on sections through the Antarctic Circumpolar Current along the zero meridian and in Drake Passage and on an EW section through the Weddell Sea. Steady state export fluxes of 234Th from the upper 100m, derived from the depletion of 234Th with respect to its parent 238U, ranged from 621±105 dpm/m**2/d to 1773±90 dpm/m**2/d. This 234Th flux was converted into an export flux of organic carbon ranging from 3.1-13.2 mmolC/m**2/d (2.1-9.0 mmolC/m**2/d) using POC/234Th ratio of bulk (respectively 〉50 µm) suspended particles at the export depth (100 m). Non-steady state fluxes assuming zero flux under ice cover were up to 23% higher. In addition, particulate and dissolved 234Th were measured underway in high resolution in the surface water with a semi-automated procedure. Particulate 234Th in surface waters is inversely correlated with light transmission and pCO2 and positively with fluorescence and optical backscatter and is interpreted as a proxy for algal biomass. High resolution underway mapping of particulate and dissolved 234Th in surface water shows clearly where trace elements are absorbed by plankton and where they are exported to depth. Quantitative determination of the export flux requires the full 234Th profile since surface depletion and export flux become decoupled through changes in wind mixed layer depth and in contribution to export from subsurface layers. In a zone of very low algal abundance (54-58 °S at the zero meridian), confirmed by satellite Chl-a data, the lowest carbon export of the ACC was observed, allowing Fe and Mn to maintain their highest surface concentrations (Klunder et al., this issue, Middag et al., this issue). An ice-edge bloom that had developed in Dec/Jan in the zone 60-65 °S as studied during the previous leg (Strass et al., in prep) had caused a high export flux at 64.5 °S when we visited the area two months later (Feb/March). The ice-edge bloom had then shifted south to 65-69 °S evident from uptake of CO2 and dissolved Fe, Mn and 234Th, without causing export yet. In this way, the parallel analysis of 234Th can help to explain the scavenging behaviour of other trace elements.
    Keywords: ANT-XXIV/3; AWI_MarGeoChem; CTD/Rosette; CTD-RO; Drake Passage; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Marine Geochemistry @ AWI; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS71; PS71/101-1; PS71/102-2; PS71/104-1; PS71/108-1; PS71/113-7; PS71/118-2; PS71/125-1; PS71/131-1; PS71/140-1; PS71/149-1; PS71/157-1; PS71/169-1; PS71/178-1; PS71/184-1; PS71/186-1; PS71/192-1; PS71/196-1; PS71/201-1; PS71/204-1; PS71/210-2; PS71/220-2; PS71/222-1; PS71/230-2; PS71/236-1; PS71/241-1; PS71/244-6; PS71/250-5; Scotia Sea, southwest Atlantic; South Atlantic Ocean; SPP1158; Weddell Sea
    Type: Dataset
    Format: application/zip, 27 datasets
    Location Call Number Expected Availability
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  • 4
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    Unknown
    PANGAEA
    In:  Supplement to: Hoogakker, Babette A A; Chapman, Mark R; McCave, I Nick; Hillaire-Marcel, Claude; Ellison, Christopher RW; Hall, Ian R; Telford, Richard J (2011): Dynamics of North Atlantic Deep Water masses during the Holocene. Paleoceanography, 26(4), PA4214, https://doi.org/10.1029/2011PA002155
    Publication Date: 2024-06-26
    Description: High resolution flow speed reconstructions of two core sites located on Gardar Drift in the northeast Atlantic Basin and Orphan Knoll in the northwest Atlantic Basin reveal a long-term decrease in flow speed of Northeast Atlantic Deep Water (NEADW) after 6,500 years. Benthic foraminiferal oxygen isotopes of sites currently bathed in NEADW show a 0.2per mil depletion after 6,500 years, shortly after the start of the development of a carbon isotope gradient between NEADW and Norwegian Sea Deep Water. We consider these changes in near-bottom flow vigor and benthic foraminiferal isotope records to mark a significant reorganization of the Holocene deep ocean circulation, and attribute the changes to a weakening of NEADW flow during the mid to late Holocene that allowed the shoaling of Lower Deep Water and deeper eastward advection of Labrador Sea Water into the northeast Atlantic Basin.
    Keywords: Age, 14C AMS; Age, calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Age, maximum/old; Age, minimum/young; BC; Box corer; Calendar age; CALYPSO; Calypso Corer; DEPTH, sediment/rock; Event label; HU91-045-093; IMAGES I; IMAGES V; Laboratory code/label; Labrador Sea; Marion Dufresne (1995); MD101; MD114; MD952024; MD95-2024; MD99-2251; Orphan Knoll; Rockall
    Type: Dataset
    Format: text/tab-separated-values, 380 data points
    Location Call Number Expected Availability
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  • 5
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    Unknown
    PANGAEA
    In:  Supplement to: Klunder, Maarten B; Laan, Patrick; Middag, Rob; de Baar, Hein J W; van Ooijen, Jan C (2011): Dissolved iron in the Southern Ocean (Atlantic sector). Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-16), 2678-2694, https://doi.org/10.1016/j.dsr2.2010.10.042
    Publication Date: 2024-06-26
    Description: We report a comprehensive dataset of dissolved iron (Fe) comprising 482 values at 22 complete vertical profiles along a 1° latitudinal section at the Zero meridian. In addition a shorter high resolution (~00°09') surface section of the southernmost part of the transect (66°00' - 69°35' S) is presented. Within the upper surface mixed layer the concentrations of dissolved Fe vary between 0.1 and 0.3 nM. An inverse trend versus fluorescence suggests significant Fe removal by plankton blooms. Vertical mixing and upwelling are the most important supply mechanisms of iron from deep waters to the upper surface mixed layer. At lower latitude (42°S) there is a distinct maximum of 0.6-0.7 nM in the 2000-3000 m depth range due to inflow of North Atlantic Deep Water. In one region (55°S) elevated dissolved Fe found in the surface mixed layer is ascribed to the recent deposition of aeolian dust originating from South America. Close to the Antarctic continent there is an indication of Fe supply in surface waters from icebergs. In the deep waters there is a strong indication of a hydrothermal plume of dissolved Fe and Mn over the ridge in the Bouvet region (52-56°S). In the Weddell Gyre basin the dissolved Fe in the deep water is 0.47±0.16 nM in the eastward flow at ~56-62°S and is lower with a value of 0.34±0.14 nM in the westward flow at high ~62-69°S latitude. At the edge of the continental ice-sheet on the prime meridian, the continental margin of the Antarctic continent appears to be lesser source of dissolved Fe than in any other place in the world; this is likely because it is unique in being overlain by the extending continental ice-sheet that largely prevents biogeochemical cycling.
    Keywords: ANT-XXIV/3; CTD/Rosette, ultra clean; CTD-UC; Date/Time of event; DEPTH, water; Drake Passage; Elevation of event; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; International Polar Year (2007-2008); IPY; Iron, dissolved; Iron, dissolved, standard deviation; Latitude of event; Longitude of event; Polarstern; PS71; PS71/101-2; PS71/103-1; PS71/104-2; PS71/107-3; PS71/110-1; PS71/113-3; PS71/116-1; PS71/119-1; PS71/122-1; PS71/128-1; PS71/131-5; PS71/135-1; PS71/138-1; PS71/141-1; PS71/144-1; PS71/147-3; PS71/150-2; PS71/161-6; PS71/163-1; PS71/167-1; PS71/175-3; PS71/178-4; PS71/187-1; PS71/191-3; PS71/193-6; PS71/198-2; PS71/204-2; PS71/210-3; PS71/212-3; PS71/216-4; PS71/221-2; PS71/222-2; PS71/223-2; PS71/226-2; PS71/230-6; PS71/236-3; PS71/238-2; PS71/241-6; PS71/244-3; PS71/249-3; PS71/250-6; PS71/251-3; PS71/252-1; Scotia Sea, southwest Atlantic; South Atlantic Ocean; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 1772 data points
    Location Call Number Expected Availability
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  • 6
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    PANGAEA
    In:  Supplement to: Croot, Peter L; Baars, Oliver; Streu, Peter (2011): The distribution of dissolved zinc in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2707-2719, https://doi.org/10.1016/j.dsr2.2010.10.041
    Publication Date: 2024-06-26
    Description: The distribution of dissolved zinc (Zn) was investigated in the Atlantic sector of the Southern Ocean in the austral autumn of 2008 as part of the IPY GEOTRACES expedition ZERO & DRAKE. Research focused on transects across the major frontal systems along the Zero Meridian and across the Drake Passage. There was a strong gradient in surface zinc concentrations observed across the Antarctic Polar Front along both transects and high zinc levels were found in surface waters throughout the Southern Ocean. Vertical profiles for dissolved Zinc showed the presence of local minima and maxima in the upper 200 m consistent with significant uptake by phytoplankton and release by zooplankton grazing, respectively. Highest deep water zinc concentrations were found in the centre of the Weddell Gyre associated with Central Intermediate Water (CIW), a water mass which is depleted in O2, elevated in CO2 and is regionally a CFC minimum. Our data suggests that the remineralization of sinking particles is a key control on the distribution of Zn in the Southern Ocean. Disappearance ratios of zinc to phosphate (Zn:P) in the upper water column increased southwards along both transects and based on laboratory studies they suggest slower growth rates of phytoplankton due to iron or light limitation. Zinc and silicate were strongly correlated throughout the study region but the disappearance ratio (Zn:Si) was relatively uniform overall except for the region close to the ice edge on the Zero Meridian.
    Keywords: ANT-XXIV/3; Bottle number; CTD/Rosette, ultra clean; CTD-UC; Date/Time of event; DEPTH, water; Drake Passage; Element analyser AAS, graphite furnace, Perkin-Elmer 4100 ZL; Elevation of event; Event label; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Latitude of event; Longitude of event; Nitrate and Nitrite; Nitrite; Phosphate; Polarstern; Pressure, water; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS71; PS71/103-1; PS71/104-2; PS71/107-3; PS71/113-3; PS71/119-1; PS71/128-1; PS71/131-5; PS71/141-1; PS71/150-2; PS71/167-1; PS71/230-6; PS71/236-3; PS71/241-6; PS71/249-3; Salinity; Scotia Sea, southwest Atlantic; Silicate; South Atlantic Ocean; SPP1158; Temperature, water; Weddell Sea; Zinc, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 1184 data points
    Location Call Number Expected Availability
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  • 7
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2024-06-26
    Keywords: ANT-XXVI/4; Attenuation, optical beam transmission; AWI_PhyOce; Calculated; Canarias Sea; Celtic Sea; Computed; Conductivity; CTD, SEA-BIRD SBE 911plus, SN T1373-C3607; CTD/Rosette; CTD-RO; Date/Time of event; Density, sigma-theta (0); DEPTH, water; Elevation of event; Event label; Fluorometer; Fluorometer, Dr. Haardt Instruments; Latitude of event; Longitude of event; Number of observations; Physical Oceanography @ AWI; Polarstern; Pressure, water; PS75; PS75/264-1; PS75/265-2; PS75/266-2; PS75/267-2; PS75/268-3; PS75/269-2; PS75/270-3; PS75/271-2; PS75/272-1; PS75/272-3; PS75/273-2; PS75/274-3; PS75/275-2; PS75/276-3; PS75/277-2; PS75/278-3; PS75/279-1; PS75/279-4; PS75/280-2; PS75/281-3; PS75/282-2; PS75/283-3; PS75/284-2; PS75/285-3; PS75/286-1; PS75/286-4; PS75/287-1; PS75/287-3; PS75/287-5; PS75/289-2; PS75/289-5; PS75/291-2; PS75/292-4; PS75/293-2; PS75/294-3; PS75/295-1; PS75/295-4; PS75/296-3; PS75/297-2; PS75/298-1; PS75/298-3; PS75/299-2; Salinity; South Atlantic Ocean; Temperature, water; Temperature, water, potential
    Type: Dataset
    Format: text/tab-separated-values, 276755 data points
    Location Call Number Expected Availability
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  • 8
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Publication Date: 2024-06-26
    Keywords: ARK-XX/1; ATLAS Parasound P70 Deep-Sea Parametric Sub-Bottom Profiler; AWI_Paleo; CT; DATE/TIME; LATITUDE; LONGITUDE; P70; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS66; PS66/1-track; Underway cruise track measurements; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 328 data points
    Location Call Number Expected Availability
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  • 9
    Publication Date: 2024-06-26
    Keywords: ANT-XI/3; Bellingshausen Sea; Comment; DATE/TIME; Date/time end; Depth, bathymetric; Event label; File size; LATITUDE; LONGITUDE; MULT; Multiple investigations; Polarstern; PS29; PS29/008; PS29/013; PS29/015; PS29/016; PS29/022; PS29/031; PS29/042-1; PS29/042-2; PS29/058; PS29/059; PS29/060; PS29/077; PS29/078-1; PS29/078-2; PS29/079; Remote operated vehicle SPRINT 103; ROVS; Sample code/label; South Pacific Ocean; Time in minutes; Uniform resource locator/link to image; Uniform resource locator/link to movie
    Type: Dataset
    Format: text/tab-separated-values, 162 data points
    Location Call Number Expected Availability
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  • 10
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    Unknown
    PANGAEA
    In:  Alfred Wegener Institute - Polarstern core repository
    Publication Date: 2024-06-26
    Keywords: ANT-XXVI/3; AWI_Paleo; Gravity corer (Kiel type); N Burke Island (moraine on drumlin); Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; PS75; PS75/233-1; SL
    Type: Dataset
    Format: unknown
    Location Call Number Expected Availability
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