A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica
Recent thinning and loss of Antarctic ice shelves has been followed by near synchronous acceleration of ice flow that may eventually lead to sustained deflation and significant contraction in the extent of grounded and floating ice. Here, we present radiocarbon dates from foraminifera that constrain...
Published in: | Scientific Reports |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-2279 2023-07-30T03:58:12+02:00 A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica Bart, Philip J. DeCesare, Matthew Rosenheim, Brad E. Majewski, Wojceich McGlannan, Austin 2018-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/msc_facpub/1292 https://doi.org/10.1038/s41598-018-29911-8 https://digitalcommons.usf.edu/context/msc_facpub/article/2279/viewcontent/s41598_018_29911_8.pdf unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1292 doi:10.1038/s41598-018-29911-8 https://digitalcommons.usf.edu/context/msc_facpub/article/2279/viewcontent/s41598_018_29911_8.pdf http://creativecommons.org/licenses/by/4.0/ Marine Science Faculty Publications Life Sciences article 2018 ftusouthflorida https://doi.org/10.1038/s41598-018-29911-8 2023-07-13T21:02:47Z Recent thinning and loss of Antarctic ice shelves has been followed by near synchronous acceleration of ice flow that may eventually lead to sustained deflation and significant contraction in the extent of grounded and floating ice. Here, we present radiocarbon dates from foraminifera that constrain the time elapsed between a previously described paleo-ice-shelf collapse and the subsequent major grounding-line retreat in the Whales Deep Basin (WDB) of eastern Ross Sea. The dates indicate that West Antarctic Ice Sheet (WAIS) grounding-line retreat from the continental shelf edge was underway prior to 14.7 ± 0.4 cal kyr BP. A paleo-ice-shelf collapse occurred at 12.3 ± 0.2 cal kyr BP. The grounding position was maintained on the outer-continental shelf until at least 11.5 ± 0.3 cal kyr BP before experiencing a 200-km retreat. Given the age uncertainties, the major grounding-line retreat lagged ice-shelf collapse by at least two centuries and by as much as fourteen centuries. In the WDB, the centuries-long delay in the retreat of grounded ice was partly due to rapid aggradational stacking of an unusually large volume of grounding-zone-wedge sediment as ice-stream discharge accelerated following ice-shelf collapse. This new deglacial reconstruction shows that ongoing changes to ice shelves may trigger complex dynamics whose consequences are realized only after a significant lag. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ross Sea University of South Florida St. Petersburg: Digital USFSP Antarctic Ross Sea West Antarctic Ice Sheet Scientific Reports 8 1 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Bart, Philip J. DeCesare, Matthew Rosenheim, Brad E. Majewski, Wojceich McGlannan, Austin A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
topic_facet |
Life Sciences |
description |
Recent thinning and loss of Antarctic ice shelves has been followed by near synchronous acceleration of ice flow that may eventually lead to sustained deflation and significant contraction in the extent of grounded and floating ice. Here, we present radiocarbon dates from foraminifera that constrain the time elapsed between a previously described paleo-ice-shelf collapse and the subsequent major grounding-line retreat in the Whales Deep Basin (WDB) of eastern Ross Sea. The dates indicate that West Antarctic Ice Sheet (WAIS) grounding-line retreat from the continental shelf edge was underway prior to 14.7 ± 0.4 cal kyr BP. A paleo-ice-shelf collapse occurred at 12.3 ± 0.2 cal kyr BP. The grounding position was maintained on the outer-continental shelf until at least 11.5 ± 0.3 cal kyr BP before experiencing a 200-km retreat. Given the age uncertainties, the major grounding-line retreat lagged ice-shelf collapse by at least two centuries and by as much as fourteen centuries. In the WDB, the centuries-long delay in the retreat of grounded ice was partly due to rapid aggradational stacking of an unusually large volume of grounding-zone-wedge sediment as ice-stream discharge accelerated following ice-shelf collapse. This new deglacial reconstruction shows that ongoing changes to ice shelves may trigger complex dynamics whose consequences are realized only after a significant lag. |
format |
Article in Journal/Newspaper |
author |
Bart, Philip J. DeCesare, Matthew Rosenheim, Brad E. Majewski, Wojceich McGlannan, Austin |
author_facet |
Bart, Philip J. DeCesare, Matthew Rosenheim, Brad E. Majewski, Wojceich McGlannan, Austin |
author_sort |
Bart, Philip J. |
title |
A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
title_short |
A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
title_full |
A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
title_fullStr |
A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
title_full_unstemmed |
A Centuries-Long Delay between a Paleo-Ice-Shelf Collapse and Grounding-Line Retreat in the Whales Deep Basin, Eastern Ross Sea, Antarctica |
title_sort |
centuries-long delay between a paleo-ice-shelf collapse and grounding-line retreat in the whales deep basin, eastern ross sea, antarctica |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2018 |
url |
https://digitalcommons.usf.edu/msc_facpub/1292 https://doi.org/10.1038/s41598-018-29911-8 https://digitalcommons.usf.edu/context/msc_facpub/article/2279/viewcontent/s41598_018_29911_8.pdf |
geographic |
Antarctic Ross Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Ross Sea West Antarctic Ice Sheet |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelf Ice Shelves Ross Sea |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1292 doi:10.1038/s41598-018-29911-8 https://digitalcommons.usf.edu/context/msc_facpub/article/2279/viewcontent/s41598_018_29911_8.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1038/s41598-018-29911-8 |
container_title |
Scientific Reports |
container_volume |
8 |
container_issue |
1 |
_version_ |
1772821069107822592 |