de.pangaea.dataset982379 und dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-07-03T08:15:56Z https://doi.pangaea.de/10.1594/PANGAEA.982379 <gco:CharacterString>Sedimentological, geochemical and sediment-physical analysis of eight sediment cores from the Mac. Robertson Shelf, East Antarctica</gco:CharacterString> 2026-06-29T08:58:43 publication https://doi.org/10.1594/PANGAEA.982379 Güntzel, Janina
janina.guentzel@awi.de
https://orcid.org/0009-0004-3713-6881 information author Müller, Juliane
juliane.mueller@awi.de
https://orcid.org/0000-0003-0724-4131 information author Lembke-Jene, Lester
Lester.Lembke-Jene@awi.de
https://orcid.org/0000-0002-6873-8533 information author Tiedemann, Ralf
ralf.tiedemann@awi.de
https://orcid.org/0000-0001-7211-8049 information author Mollenhauer, Gesine
gesine.mollenhauer@awi.de
https://orcid.org/0000-0001-5138-564X information author Klages, Johann Philipp
Johann.Klages@awi.de
https://orcid.org/0000-0003-0968-1183 information author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital The future behavior of the Antarctic Ice Sheet is considered to be one of the largest uncertainties in global climate projections, with its stability fundamentally governed by grounding-zone processes, bed geometry, and sensitivity to oceanic forcing. However, observational records only reflect a short moment when considering the length of a full cycle of ice sheet expansion and retreat. Therefore, paleo-data present a valuable extension to the observational period. East Antarctica's deglaciation history remains largely understudied compared to the West Antarctic margin. This emphasizes the urgent need for reliable long-term spatiotemporal data on ice sheet change, particularly for sectors that play key roles in supplying the world's oceans with dense bottom water. In this study, we performed a multi-proxy analysis on geophysical and geological data recovered from two prominent glacial cross-shelf troughs on the Mac. Robertson continental shelf. We classified submarine glacial landforms on the continental shelf along both troughs from combined multibeam swath bathymetry and sub-bottom profiler data to infer past grounding line extent and the pattern of subsequent grounding line retreat. Additionally, combined sedimentological, sediment-physical, and geochemical analyses, including foraminifer radiocarbon dating, reveal the style and timing of this retreat across the shelf. Our study concludes that grounded ice reached the Mac. Robertson continental shelf break until just before ~12.7 cal. ka BP, hence preventing the formation of Dense Shelf Water (DSW) in its current form. We therefore infer a different formation mechanism for DSW as an important precursor of Antarctic Bottom Water under such full glacial conditions before continued grounding-line retreat exposed the middle continental shelf by ~10.8 cal. ka BP and set the stage for more modern-like conditions. completed Antarctic Shelf East Antarctica Polarstern Radiocarbon ages Sedimentology-marine cores theme <gco:CharacterString>PANGAEA Keyword List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright restricted copyright CC-BY-4.0: Creative Commons Attribution 4.0 International (License comes into effect after moratorium ends) textTable und geoscientificInformation 63.18823 65.81721 -67.142285 -66.828596 2022-02-09T10:00:57 2022-02-10T21:34:36 application/zip unknown https://doi.pangaea.de/10.1594/PANGAEA.982379?format=zip download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. Supplement to <gco:CharacterString>Last Glacial Maximum extent and subsequent retreat of the East Antarctic Ice Sheet from the Mac. Robertson Shelf</gco:CharacterString> 2026-01-01 publication https://doi.org/10.5194/tc-20-3739-2026 Güntzel, Janina
janina.guentzel@awi.de
https://orcid.org/0009-0004-3713-6881 information author Müller, Juliane
juliane.mueller@awi.de
https://orcid.org/0000-0003-0724-4131 information author Tiedemann, Ralf
ralf.tiedemann@awi.de
https://orcid.org/0000-0001-7211-8049 information author Mollenhauer, Gesine
gesine.mollenhauer@awi.de
https://orcid.org/0000-0001-5138-564X information author Lembke-Jene, Lester
Lester.Lembke-Jene@awi.de
https://orcid.org/0000-0002-6873-8533 information author Weigelt, Estella
estella.weigelt@awi.de
https://orcid.org/0000-0003-1598-456X information author Schopen, Lasse author Wesch, Niklas author Kattein, Laura
laura.kattein@awi.de
author Mackintosh, Andrew https://orcid.org/0000-0002-6430-4711 information author Klages, Johann Philipp
Johann.Klages@awi.de
https://orcid.org/0000-0003-0968-1183 information author documentDigital The Cryosphere 20(7) 3739-3758