ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • PANGAEA  (53)
Collection
Keywords
Years
  • 1
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Bahr, André; Hoffmann, Julia; Schönfeld, Joachim; Schmidt, Matthew W; Nürnberg, Dirk; Batenburg, Sietske J; Voigt, Silke (2018): Low-latitude expressions of high-latitude forcing during Heinrich Stadial 1 and the Younger Dryas in northern South America. Global and Planetary Change, 160, 1-9, https://doi.org/10.1016/j.gloplacha.2017.11.008
    Publication Date: 2023-03-03
    Description: Changes in Atlantic Meridional Overturning Circulation (AMOC) strength exert a major influence on global atmospheric circulation patterns. However, the pacing and mechanisms of low-latitude responses to high-latitude forcing are insufficiently constrained so far. To elucidate the interaction of atmospheric and oceanic forcing in tropical South America dur-ing periods of major AMOC reductions (Heinrich Stadial 1 and the Younger Dryas) we gen-erated a high-resolution foraminiferal multi-proxy record from off the Orinoco River based on Ba/Ca and Mg/Ca ratios, as well as stable isotope measurements. The data clearly indi-cate a three-phased structure of HS1 based on the reconfiguration of ocean currents in the tropical Atlantic Ocean. The initial phase (HS1a) is characterized by a diminished North Brazil Current, a southward displacement of the ITCZ, and moist conditions dominating northeastern Brazil. During subsequent HS1b, the NBC was even more diminished or yet reversed and the ITCZ shifted to its southernmost position. Hence, dryer conditions pre-vailed in northern South America, while eastern Brazil experienced maximally wet condi-tions. During the final stage, HS1c, conditions are similar to HS1a. The YD represents a smaller amplitude version of HS1 with a southward-shifted ITCZ. Our findings imply that the low-latitude continental climate response to high-latitude forcing is mediated by recon-figurations of surface ocean currents in low latitudes. Our new records demonstrate the ex-treme sensitivity of the terrestrial realm in tropical South America to abrupt perturbations in oceanic circulation during periods of unstable climate conditions.
    Keywords: 235-1; AGE; DEPTH, sediment/rock; Globigerinoides ruber, Aluminium/Calcium ratio; Globigerinoides ruber, Barium/Calcium ratio; Globigerinoides ruber, Iron/Calcium ratio; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, Manganese/Calcium ratio; Globigerinoides ruber, δ13C; Globigerinoides ruber, δ18O; M78/1; M78/1_235-1; Meteor (1986); N. Tobago; PC; Piston corer; Sea surface temperature, annual mean; SST from Mg/Ca ratios; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 1818 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Publication Date: 2023-01-30
    Description: This dataset combines the oceanic and atmospheric outputs from various experiments modelling the Drake Passage opening during the Eocene (Toumoulin et al. 2020, Paleoceanography and Paleoclimatology). It includes 4 simulations with a 40 Ma paleogeography, a 1120 ppm pCO2 and different depths of the Drake Passage (0, 100, 1000, 2500m). Experiments were performed with the general circulation model IPSL-CM5A2. Each of these simulations ran for 4000 years until a quasi-equilibrium state (deep ocean temperature change 〈0.1°C/century). Data are monthly averages over the last 100 years.
    Keywords: Antarctic Circumpolar Current; climate; Eocene; File content; File format; File name; File size; general circulation model; Ocean Gateways; Paleoclimate; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Publication Date: 2023-07-24
    Description: The Middle Eocene Climatic Optimum (MECO) at ca. 40 Ma is one of the largest of the transient Eocene global warming events. However, it is relatively poorly known from tropical settings since few sites span the entirety of the MECO event and/or host calcareous microfossils, which are the dominant proxy carrier for palaeoceanographic reconstructions. Ocean Drilling Program (ODP) Pacific Ocean Site 143-865 in the low-latitude North Pacific (Allison Guyot) has the potential to provide a useful tropical MECO reference but detailed stratigraphic and chronological constraints needed to evaluate its completeness were previously lacking. We have addressed this deficit by generating new high-resolution biostratigraphic, stable isotope and X-ray fluorescence (XRF) records spanning the MECO interval (~38.0-43.0 Ma) in two holes drilled at Site 143-865. XRF-derived strontium/calcium (Sr/Ca) and barium/strontium (Ba/Sr) ratio and Fe count records allow correlation between holes and reveal pronounced rhythmicity, enabling us to develop the first composite section for Holes 143-865B and 143-865C and a preliminary cyclostratigraphy for the MECO. Using this new framework, the sedimentary record is interpreted to be continuous across the event, as identified by a pronounced transient benthic foraminiferal δ¹⁸O shift of ~0.8‰. Calcareous microfossil biostratigraphic events from widely used zonation schemes are recognized, with generally good agreement between the two holes, highlighting the robustness of the new composite section and allowing us to identify planktic foraminiferal Zones E10-E15 and calcareous nannofossil Zones NP15-18. However, discrepancies in the relative position and ordering of several primary and secondary bioevents with respect to published schemes are noted. Specifically, the stratigraphic highest occurrences of planktic foraminifera Acarinina bullbrooki, Guembelitrioides nuttalli, and Morozovella aragonensis, and calcareous nannofossils Chiasmolithus solitus and Sphenolithus furcatolithoides and the lowest occurrence of Reticulofenestra reticulata, all appear higher in the section than would be predicted relative to other bioevents. We also note conspicuous reworking of older microfossils (from planktic foraminiferal Zones E5-E9 and E13) into younger sediments (planktic foraminiferal Zones E14-15) within our study interval consistent with reworking above the MECO interval. Regardless of reworking, the high-quality XRF records enable decimeter scale correlation between holes and highlight the potential of Site 143-865 for constraining tropical environmental and biotic changes, not just across the MECO but also throughout the Paleocene and early-to-middle Eocene interval.
    Type: Dataset
    Format: application/zip, 14 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Publication Date: 2023-08-12
    Keywords: 342-U1403A; 342-U1403B; Comment; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp342; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Joides Resolution; Paleogene Newfoundland Sediment Drifts; Sample code/label; δ13C, bulk carbonate; δ18O, carbonate
    Type: Dataset
    Format: text/tab-separated-values, 1201 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Batenburg, Sietske J; Friedrich, Oliver; Moriya, Kazuyoshi; Voigt, Silke; Cournède, Cécile; Moebius, Iris; Blum, Peter; Bornemann, André; Fiebig, Jens; Hasegawa, Takashi; Hull, Pincelli M; Norris, Richard D; Röhl, Ursula; Sexton, Philip F; Westerhold, Thomas; Wilson, Paul A; IODP Expedition 342 Scientists (2017): Late Maastrichtian carbon isotope stratigraphy and cyclostratigraphy of the Newfoundland Margin (Site U1403, IODP Leg 342). Newsletters on Stratigraphy, 51(2), https://doi.org/10.1127/nos/2017/0398
    Publication Date: 2023-08-12
    Description: Earth's climate during the Maastrichtian (latest Cretaceous) was punctuated by brief warming and cooling episodes, accompanied by perturbations of the global carbon cycle. Superimposed on a long-term cooling trend, the middle Maastrichtian is characterized by deep-sea warming and relatively high values of stable carbon-isotope ratios, followed by strong climatic variability towards the end of the Cretaceous. A lack of knowledge on the timing of climatic change inhibits our understanding of underlying causal mechanisms. We present an integrated stratigraphy from Integrated Ocean Drilling Program (IODP) Site U1403, providing an expanded deep ocean record from the North Atlantic (Expedition 342, Newfoundland Margin). Distinct sedimentary cyclicity suggests that orbital forcing played a major role in depositional processes, which is confirmed by statistical analyses of high resolution elemental data obtained by X-ray fluorescence (XRF) core scanning. Astronomical calibration reveals that the investigated interval encompasses seven 405-kyr cycles (Ma_405_1 to Ma_405_7) and spans the 2.8 Myr directly preceding the Cretaceous/Paleocene (K/Pg) boundary. A high-resolution carbon-isotope record from bulk carbonates allows us to identify global trends in the late Maastrichtian carbon cycle. Low-amplitude variations (up to 0.4 per mil) in carbon isotopes at Site U1403 match similar scale variability in records from Tethyan and Pacific open-ocean sites. Comparison between Site U1403 and the hemipelagic restricted basin of the Zumaia section (northern Spain), with its own well-established independent cyclostratigraphic framework, is more complex. Whereas the pre-K/Pg oscillations and the negative values of the Mid-Maastrichtian Event (MME) can be readily discerned in both the Zumaia and U1403 records, patterns diverge during a ~1 Myr period in the late Maastrichtian (67.8-66.8 Ma), with Site U1403 more reliably reflecting global carbon cycling. Our new carbon isotope record and cyclostratigraphy offer promise for Site U1403 to serve as a future reference section for high-resolution studies of late Maastrichtian paleoclimatic change.
    Keywords: Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Publication Date: 2023-08-12
    Keywords: 342-U1403A; 342-U1403B; Barium, area, total counts; Calcium, area, total counts; Depth, composite revised; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp342; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Iron, area, total counts; Joides Resolution; Paleogene Newfoundland Sediment Drifts; Sample code/label; Silicon, area, total counts; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 9587 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Frisch, Konstantin; Voigt, Silke; Verestek, Verena; Appel, Erwin; Albert, Richard; Gerdes, Axel; Arndt, Iris; Raddatz, Jacek; Voigt, Thomas; Weber, Yuki; Batenburg, Sietske J (2019): Long‐Period Astronomical Forcing of Westerlies' Strength in Central Asia During Miocene Climate Cooling. Paleoceanography and Paleoclimatology, 34(11), 1784-1806, https://doi.org/10.1029/2019PA003642
    Publication Date: 2023-10-07
    Description: The Aktau succession is located at 44.03°N and 79.30°E in the Ili Basin, south-east Kazakhstan. The dataset contains measurement results from the Middle to early Late Miocene part of the succession (total height: 372 m, lowermost sample: 0.29 m, uppermost sample: 370.94 m). Stable carbon and oxygen istopes and CaSO₄ content were derived from bulk rock measurements. The CaSO₄ content was determined by microwave digestions and ICP-OES analysis. The laser ablation U-Pb data was aquired from thin sections in order to obtain radiometric ages of carbonates along the Aktau succession.
    Keywords: Aktau succession; CaSO4 content; Ili Basin; Laser ablation U-Pb dating; stable carbon isotopes; stable oxygen isotopes
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Publication Date: 2023-10-07
    Description: The Aktau succession is located at 44.03°N and 79.30°E in the Ili Basin, south-east Kazakhstan. The dataset contains measurement results from the Middle to early Late Miocene part of the succession (total height: 372 m, lowermost sample: 0.29 m, uppermost sample: 370.94 m). Stable carbon and oxygen istopes were derived from bulk rock measurements.
    Keywords: Aktau; Aktau succession; DEPTH, sediment/rock; Ili Basin; Ili Basin, Kazakhstan; OUTCROP; Outcrop sample; Sample ID; stable carbon isotopes; stable oxygen isotopes; δ13C; δ18O
    Type: Dataset
    Format: text/tab-separated-values, 2463 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Publication Date: 2023-10-07
    Description: The Aktau succession is located at 44.03°N and 79.30°E in the Ili Basin, south-east Kazakhstan. The dataset contains measurement results from the Middle to early Late Miocene part of the succession (total height: 372 m, lowermost sample: 0.29 m, uppermost sample: 370.94 m). CaSO₄ content were derived from bulk rock measurements. The CaSO₄ content was determined by microwave digestions and ICP-OES analysis.
    Keywords: Aktau; Aktau succession; Calcium sulfate; CaSO4 content; DEPTH, sediment/rock; ICP-OES, Inductively coupled plasma - optical emission spectrometry; Ili Basin; Ili Basin, Kazakhstan; OUTCROP; Outcrop sample; Sample ID
    Type: Dataset
    Format: text/tab-separated-values, 1396 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Publication Date: 2023-10-07
    Description: The Aktau succession is located at 44.03°N and 79.30°E in the Ili Basin, south-east Kazakhstan. The dataset contains measurement results from the Middle to early Late Miocene part of the succession (total height: 372 m, lowermost sample: 0.29 m, uppermost sample: 370.94 m). The laser ablation U-Pb data was aquired from thin sections in order to obtain radiometric ages of carbonates along the Aktau succession.
    Keywords: Aktau; Aktau succession; Common 206Pb in total 206Pb; Correlation coefficient, isotope ratio error; Event label; Ili Basin; Ili Basin, Kazakhstan; LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer; Laser ablation U-Pb dating; Lead; Lead-206; Lead-207/Lead-206, error, relative; Lead-207/Lead-206 ratio; OUTCROP; Outcrop sample; Position; Sample code/label; Thorium/Uranium ratio; Uranium; Uranium-238/Lead-206, error, relative; Uranium-238/Lead-206 ratio
    Type: Dataset
    Format: text/tab-separated-values, 3700 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...