Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica
Ice loss from the marine-based, inherently unstable West Antarctic Ice Sheet (WAIS) contributes to the currently observed rise in sea-level and may raise it by up to 3.3-5 metres in the future. Over the last few decades, glaciers draining the WAIS into the Amundsen Sea Embayment (ASE), in particular...
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ftawi:oai:epic.awi.de:26154 2024-09-15T17:39:06+00:00 Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica Kuhn, Gerhard Hillenbrand, Claus-Dieter Klages, Johann Philipp Smith, James A. Graham, Alastair G. C. Larter, Robert D. Gohl, Karsten 2012 application/pdf https://epic.awi.de/id/eprint/26154/ https://epic.awi.de/id/eprint/26154/1/Poster_PUP_London_2012_small.pdf https://hdl.handle.net/10013/epic.39076 https://hdl.handle.net/10013/epic.39076.d001 unknown https://epic.awi.de/id/eprint/26154/1/Poster_PUP_London_2012_small.pdf https://hdl.handle.net/10013/epic.39076.d001 Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. , Klages, J. P. orcid:0000-0003-0968-1183 , Smith, J. A. , Graham, A. G. C. , Larter, R. D. and Gohl, K. orcid:0000-0002-9558-2116 (2012) Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica , Planet Under Pressure 2012, London, England, 26 March 2012 - 29 March 2012 . hdl:10013/epic.39076 EPIC3Planet Under Pressure 2012, London, England, 2012-03-26-2012-03-29 Conference notRev 2012 ftawi 2024-06-24T04:03:49Z Ice loss from the marine-based, inherently unstable West Antarctic Ice Sheet (WAIS) contributes to the currently observed rise in sea-level and may raise it by up to 3.3-5 metres in the future. Over the last few decades, glaciers draining the WAIS into the Amundsen Sea Embayment (ASE), in particular into Pine Island Bay, have shown thinning, grounding-line retreat and ice-flow acceleration at dramatic rates. These changes are mainly attributed to significant ice-shelf melting by upwelling warm deep water. A critical unknown, limiting our ability to accurately predict future WAIS behaviour, is the poorly constrained long-term context of ice-sheet retreat in the ASE. Here we present a new pre-Holocene to present chronology for WAIS retreat in Pine Island Bay (PIB) based on radiocarbon dating of marine sediment cores. The dates give evidence that grounded ice had retreated close to its modern-day position by ~10 ka BP. Maximum average retreat rates calculated from the deglaciation ages suggest, that the current rapid WAIS retreat in Pine Island Bay is unprecedented over the last ~10 ka and originates in recent changes in regional climate, ocean circulation or ice-sheet dynamics. However, our data and previously published ages for grounding-line retreat from the wider ASE further demonstrate, that, other than in the Ross Sea, the WAIS did not retreat continuously since the LGM. A unique assemblage of glacial morphological features mapped on the eastern ASE shelf suggest a more complex deglacial history, with ice masses slowly flowing and/or stagnating on topographic highs (’Inter-ice stream ridges’) adjacent to main palaeo-ice stream troughs. The incorporation of our results into ice-sheet models will improve predictions of future sea-level rise. Conference Object Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Ross Sea West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Ice loss from the marine-based, inherently unstable West Antarctic Ice Sheet (WAIS) contributes to the currently observed rise in sea-level and may raise it by up to 3.3-5 metres in the future. Over the last few decades, glaciers draining the WAIS into the Amundsen Sea Embayment (ASE), in particular into Pine Island Bay, have shown thinning, grounding-line retreat and ice-flow acceleration at dramatic rates. These changes are mainly attributed to significant ice-shelf melting by upwelling warm deep water. A critical unknown, limiting our ability to accurately predict future WAIS behaviour, is the poorly constrained long-term context of ice-sheet retreat in the ASE. Here we present a new pre-Holocene to present chronology for WAIS retreat in Pine Island Bay (PIB) based on radiocarbon dating of marine sediment cores. The dates give evidence that grounded ice had retreated close to its modern-day position by ~10 ka BP. Maximum average retreat rates calculated from the deglaciation ages suggest, that the current rapid WAIS retreat in Pine Island Bay is unprecedented over the last ~10 ka and originates in recent changes in regional climate, ocean circulation or ice-sheet dynamics. However, our data and previously published ages for grounding-line retreat from the wider ASE further demonstrate, that, other than in the Ross Sea, the WAIS did not retreat continuously since the LGM. A unique assemblage of glacial morphological features mapped on the eastern ASE shelf suggest a more complex deglacial history, with ice masses slowly flowing and/or stagnating on topographic highs (’Inter-ice stream ridges’) adjacent to main palaeo-ice stream troughs. The incorporation of our results into ice-sheet models will improve predictions of future sea-level rise. |
format |
Conference Object |
author |
Kuhn, Gerhard Hillenbrand, Claus-Dieter Klages, Johann Philipp Smith, James A. Graham, Alastair G. C. Larter, Robert D. Gohl, Karsten |
spellingShingle |
Kuhn, Gerhard Hillenbrand, Claus-Dieter Klages, Johann Philipp Smith, James A. Graham, Alastair G. C. Larter, Robert D. Gohl, Karsten Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
author_facet |
Kuhn, Gerhard Hillenbrand, Claus-Dieter Klages, Johann Philipp Smith, James A. Graham, Alastair G. C. Larter, Robert D. Gohl, Karsten |
author_sort |
Kuhn, Gerhard |
title |
Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
title_short |
Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
title_full |
Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
title_fullStr |
Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
title_full_unstemmed |
Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica |
title_sort |
pre-holocene to recent deglaciation of the amundsen sea embayment, west antarctica |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/26154/ https://epic.awi.de/id/eprint/26154/1/Poster_PUP_London_2012_small.pdf https://hdl.handle.net/10013/epic.39076 https://hdl.handle.net/10013/epic.39076.d001 |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Ross Sea West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Ross Sea West Antarctica |
op_source |
EPIC3Planet Under Pressure 2012, London, England, 2012-03-26-2012-03-29 |
op_relation |
https://epic.awi.de/id/eprint/26154/1/Poster_PUP_London_2012_small.pdf https://hdl.handle.net/10013/epic.39076.d001 Kuhn, G. orcid:0000-0001-6069-7485 , Hillenbrand, C. D. , Klages, J. P. orcid:0000-0003-0968-1183 , Smith, J. A. , Graham, A. G. C. , Larter, R. D. and Gohl, K. orcid:0000-0002-9558-2116 (2012) Pre-Holocene to recent deglaciation of the Amundsen Sea Embayment, West Antarctica , Planet Under Pressure 2012, London, England, 26 March 2012 - 29 March 2012 . hdl:10013/epic.39076 |
_version_ |
1810477491176865792 |