Widespread collapse of the Ross Ice Shelf during the late Holocene
The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (-560 m), linear iceberg furrows on the outer, western...
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Online Access: | https://doi.org/10.1073/pnas.1516908113 http://ecite.utas.edu.au/109886 |
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ftunivtasecite:oai:ecite.utas.edu.au:109886 2023-05-15T14:03:26+02:00 Widespread collapse of the Ross Ice Shelf during the late Holocene Yokoyama, Y Anderson, JB Yamane, M Simkins, LM Miyairi, Y Yamazaki, T Koizumi, M Suga, H Kusahara, K Prothro, L Hasumi, H Southon, JR Ohkouchi, N 2016 https://doi.org/10.1073/pnas.1516908113 http://ecite.utas.edu.au/109886 en eng Natl Acad Sciences http://dx.doi.org/10.1073/pnas.1516908113 Yokoyama, Y and Anderson, JB and Yamane, M and Simkins, LM and Miyairi, Y and Yamazaki, T and Koizumi, M and Suga, H and Kusahara, K and Prothro, L and Hasumi, H and Southon, JR and Ohkouchi, N, Widespread collapse of the Ross Ice Shelf during the late Holocene, Proceedings of the National Academy of Sciences of the United States of America, 113, (9) pp. 2354-2359. ISSN 0027-8424 (2016) [Refereed Article] http://ecite.utas.edu.au/109886 Earth Sciences Atmospheric Sciences Climate Change Processes Refereed Article PeerReviewed 2016 ftunivtasecite https://doi.org/10.1073/pnas.1516908113 2019-12-13T22:10:32Z The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (-560 m), linear iceberg furrows on the outer, western Ross Sea continental shelf record an early post-Last Glacial Maximum episode of ice-shelf collapse that was followed by continuous retreat of the grounding line for ∼200 km. Runaway grounding line conditions culminated once the ice became pinned on shallow banks in the western Ross Sea. This early episode of ice-shelf collapse is not observed in the eastern Ross Sea, where more episodic grounding line retreat took place. More widespread (∼280,000 km2) retreat of the ancestral Ross Ice Shelf occurred during the late Holocene. This event is recorded in sediment cores by a shift from terrigenous glacimarine mud to diatomaceous open-marine sediment as well as an increase in radiogenic beryllium (10Be) concentrations. The timing of ice-shelf breakup is constrained by compound specific radiocarbon ages, the first application of this technique systematically applied to Antarctic marine sediments. Breakup initiated around 5 ka, with the ice shelf reaching its current configuration ∼1.5 ka. In the eastern Ross Sea, the ice shelf retreated up to 100 km in about a thousand years. Three-dimensional thermodynamic ice-shelf/ocean modeling results and comparison with ice-core records indicate that ice-shelf breakup resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf. Article in Journal/Newspaper Antarc* Antarctic ice core Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea eCite UTAS (University of Tasmania) Antarctic Ross Ice Shelf Ross Sea Proceedings of the National Academy of Sciences 113 9 2354 2359 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Atmospheric Sciences Climate Change Processes |
spellingShingle |
Earth Sciences Atmospheric Sciences Climate Change Processes Yokoyama, Y Anderson, JB Yamane, M Simkins, LM Miyairi, Y Yamazaki, T Koizumi, M Suga, H Kusahara, K Prothro, L Hasumi, H Southon, JR Ohkouchi, N Widespread collapse of the Ross Ice Shelf during the late Holocene |
topic_facet |
Earth Sciences Atmospheric Sciences Climate Change Processes |
description |
The stability of modern ice shelves is threatened by atmospheric and oceanic warming. The geologic record of formerly glaciated continental shelves provides a window into the past of how ice shelves responded to a warming climate. Fields of deep (-560 m), linear iceberg furrows on the outer, western Ross Sea continental shelf record an early post-Last Glacial Maximum episode of ice-shelf collapse that was followed by continuous retreat of the grounding line for ∼200 km. Runaway grounding line conditions culminated once the ice became pinned on shallow banks in the western Ross Sea. This early episode of ice-shelf collapse is not observed in the eastern Ross Sea, where more episodic grounding line retreat took place. More widespread (∼280,000 km2) retreat of the ancestral Ross Ice Shelf occurred during the late Holocene. This event is recorded in sediment cores by a shift from terrigenous glacimarine mud to diatomaceous open-marine sediment as well as an increase in radiogenic beryllium (10Be) concentrations. The timing of ice-shelf breakup is constrained by compound specific radiocarbon ages, the first application of this technique systematically applied to Antarctic marine sediments. Breakup initiated around 5 ka, with the ice shelf reaching its current configuration ∼1.5 ka. In the eastern Ross Sea, the ice shelf retreated up to 100 km in about a thousand years. Three-dimensional thermodynamic ice-shelf/ocean modeling results and comparison with ice-core records indicate that ice-shelf breakup resulted from combined atmospheric warming and warm ocean currents impinging onto the continental shelf. |
format |
Article in Journal/Newspaper |
author |
Yokoyama, Y Anderson, JB Yamane, M Simkins, LM Miyairi, Y Yamazaki, T Koizumi, M Suga, H Kusahara, K Prothro, L Hasumi, H Southon, JR Ohkouchi, N |
author_facet |
Yokoyama, Y Anderson, JB Yamane, M Simkins, LM Miyairi, Y Yamazaki, T Koizumi, M Suga, H Kusahara, K Prothro, L Hasumi, H Southon, JR Ohkouchi, N |
author_sort |
Yokoyama, Y |
title |
Widespread collapse of the Ross Ice Shelf during the late Holocene |
title_short |
Widespread collapse of the Ross Ice Shelf during the late Holocene |
title_full |
Widespread collapse of the Ross Ice Shelf during the late Holocene |
title_fullStr |
Widespread collapse of the Ross Ice Shelf during the late Holocene |
title_full_unstemmed |
Widespread collapse of the Ross Ice Shelf during the late Holocene |
title_sort |
widespread collapse of the ross ice shelf during the late holocene |
publisher |
Natl Acad Sciences |
publishDate |
2016 |
url |
https://doi.org/10.1073/pnas.1516908113 http://ecite.utas.edu.au/109886 |
geographic |
Antarctic Ross Ice Shelf Ross Sea |
geographic_facet |
Antarctic Ross Ice Shelf Ross Sea |
genre |
Antarc* Antarctic ice core Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea |
genre_facet |
Antarc* Antarctic ice core Ice Shelf Ice Shelves Iceberg* Ross Ice Shelf Ross Sea |
op_relation |
http://dx.doi.org/10.1073/pnas.1516908113 Yokoyama, Y and Anderson, JB and Yamane, M and Simkins, LM and Miyairi, Y and Yamazaki, T and Koizumi, M and Suga, H and Kusahara, K and Prothro, L and Hasumi, H and Southon, JR and Ohkouchi, N, Widespread collapse of the Ross Ice Shelf during the late Holocene, Proceedings of the National Academy of Sciences of the United States of America, 113, (9) pp. 2354-2359. ISSN 0027-8424 (2016) [Refereed Article] http://ecite.utas.edu.au/109886 |
op_doi |
https://doi.org/10.1073/pnas.1516908113 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
113 |
container_issue |
9 |
container_start_page |
2354 |
op_container_end_page |
2359 |
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1766274091580391424 |