Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica
The Amundsen Sea drainage sector of the West Antarctic Ice Sheet (WAIS) is widely regarded as a candidate for triggering potential WAIS collapse. The grounded ice sheet drains into the Amundsen Sea Embayment and is thereby buttressed by its fringing ice shelves, which have thinned at an alarming rat...
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Online Access: | https://epic.awi.de/id/eprint/50781/ https://epic.awi.de/id/eprint/50781/1/Lamping_et_al_2020.pdf https://doi.org/10.1016/j.quascirev.2019.106103 https://hdl.handle.net/10013/epic.9734c33e-5ede-452a-b528-a9cbc3cf36db https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:50781 2023-05-15T13:23:35+02:00 Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica Lamping, Nele Müller, Juliane Esper, Oliver Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard 2020-01-15 application/pdf https://epic.awi.de/id/eprint/50781/ https://epic.awi.de/id/eprint/50781/1/Lamping_et_al_2020.pdf https://doi.org/10.1016/j.quascirev.2019.106103 https://hdl.handle.net/10013/epic.9734c33e-5ede-452a-b528-a9cbc3cf36db https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/50781/1/Lamping_et_al_2020.pdf https://hdl.handle.net/ Lamping, N. orcid:0000-0001-6258-8952 , Müller, J. orcid:0000-0003-0724-4131 , Esper, O. , Hillenbrand, C. D. , Smith, J. A. and Kuhn, G. (2020) Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica , Quaternary Science Reviews, 228 , p. 106103 . doi:10.1016/j.quascirev.2019.106103 <https://doi.org/10.1016/j.quascirev.2019.106103> , hdl:10013/epic.9734c33e-5ede-452a-b528-a9cbc3cf36db EPIC3Quaternary Science Reviews, 228, pp. 106103, ISSN: 02773791 Article isiRev 2020 ftawi https://doi.org/10.1016/j.quascirev.2019.106103 2021-12-24T15:45:09Z The Amundsen Sea drainage sector of the West Antarctic Ice Sheet (WAIS) is widely regarded as a candidate for triggering potential WAIS collapse. The grounded ice sheet drains into the Amundsen Sea Embayment and is thereby buttressed by its fringing ice shelves, which have thinned at an alarming rate. Satellite-based observations additionally reveal a considerable long-term decrease in sea-ice cover in the Amundsen Sea over the last two decades although the long-term significance of this trend is unclear due to the short instrumental record since the 1970s. In this context, investigations of past sea-ice conditions are crucial for improving our understanding of the influence that sea-ice variability has on the adjacent marine environment as well as any role it plays in modulating ice shelf and ice sheet dynamics. In this study, we apply novel organic geochemical biomarker techniques to a marine sediment core from the western Amundsen Sea shelf in order to provide a valuable long-term perspective on sea-ice conditions and the retreat of the Getz Ice Shelf during the last deglaciation. We analysed a specific biomarker lipid called IPSO25 alongside a phytoplankton biomarker and sedimentological parameters and additionally applied diatom transfer functions for reconstructing palaeo sea-ice coverage. This multi-proxy data set reveals a dynamic behaviour of the Getz Ice Shelf and sea-ice cover during the deglaciation following the last ice age, with potential linkages to inter-hemispheric seesaw climate patterns. We further apply and evaluate the recently proposed PIPSO25 approach for semi-quantitative sea-ice reconstructions and discuss potential limitations. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Getz Ice Shelf Ice Sheet Ice Shelf Ice Shelves Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Amundsen Sea West Antarctic Ice Sheet Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Getz Ice Shelf ENVELOPE(-126.500,-126.500,-74.250,-74.250) Quaternary Science Reviews 228 106103 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Amundsen Sea drainage sector of the West Antarctic Ice Sheet (WAIS) is widely regarded as a candidate for triggering potential WAIS collapse. The grounded ice sheet drains into the Amundsen Sea Embayment and is thereby buttressed by its fringing ice shelves, which have thinned at an alarming rate. Satellite-based observations additionally reveal a considerable long-term decrease in sea-ice cover in the Amundsen Sea over the last two decades although the long-term significance of this trend is unclear due to the short instrumental record since the 1970s. In this context, investigations of past sea-ice conditions are crucial for improving our understanding of the influence that sea-ice variability has on the adjacent marine environment as well as any role it plays in modulating ice shelf and ice sheet dynamics. In this study, we apply novel organic geochemical biomarker techniques to a marine sediment core from the western Amundsen Sea shelf in order to provide a valuable long-term perspective on sea-ice conditions and the retreat of the Getz Ice Shelf during the last deglaciation. We analysed a specific biomarker lipid called IPSO25 alongside a phytoplankton biomarker and sedimentological parameters and additionally applied diatom transfer functions for reconstructing palaeo sea-ice coverage. This multi-proxy data set reveals a dynamic behaviour of the Getz Ice Shelf and sea-ice cover during the deglaciation following the last ice age, with potential linkages to inter-hemispheric seesaw climate patterns. We further apply and evaluate the recently proposed PIPSO25 approach for semi-quantitative sea-ice reconstructions and discuss potential limitations. |
format |
Article in Journal/Newspaper |
author |
Lamping, Nele Müller, Juliane Esper, Oliver Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard |
spellingShingle |
Lamping, Nele Müller, Juliane Esper, Oliver Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
author_facet |
Lamping, Nele Müller, Juliane Esper, Oliver Hillenbrand, Claus-Dieter Smith, James A. Kuhn, Gerhard |
author_sort |
Lamping, Nele |
title |
Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
title_short |
Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
title_full |
Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
title_fullStr |
Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
title_full_unstemmed |
Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica |
title_sort |
highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western amundsen sea, antarctica |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/50781/ https://epic.awi.de/id/eprint/50781/1/Lamping_et_al_2020.pdf https://doi.org/10.1016/j.quascirev.2019.106103 https://hdl.handle.net/10013/epic.9734c33e-5ede-452a-b528-a9cbc3cf36db https://hdl.handle.net/ |
long_lat |
ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(-126.500,-126.500,-74.250,-74.250) |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet Getz Getz Ice Shelf |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet Getz Getz Ice Shelf |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Getz Ice Shelf Ice Sheet Ice Shelf Ice Shelves Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Getz Ice Shelf Ice Sheet Ice Shelf Ice Shelves Sea ice |
op_source |
EPIC3Quaternary Science Reviews, 228, pp. 106103, ISSN: 02773791 |
op_relation |
https://epic.awi.de/id/eprint/50781/1/Lamping_et_al_2020.pdf https://hdl.handle.net/ Lamping, N. orcid:0000-0001-6258-8952 , Müller, J. orcid:0000-0003-0724-4131 , Esper, O. , Hillenbrand, C. D. , Smith, J. A. and Kuhn, G. (2020) Highly branched isoprenoids reveal onset of deglaciation followed by dynamic sea-ice conditions in the western Amundsen Sea, Antarctica , Quaternary Science Reviews, 228 , p. 106103 . doi:10.1016/j.quascirev.2019.106103 <https://doi.org/10.1016/j.quascirev.2019.106103> , hdl:10013/epic.9734c33e-5ede-452a-b528-a9cbc3cf36db |
op_doi |
https://doi.org/10.1016/j.quascirev.2019.106103 |
container_title |
Quaternary Science Reviews |
container_volume |
228 |
container_start_page |
106103 |
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