Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134
Sea-level rise due to ice loss in the Northern Hemisphere in response to insolation and greenhouse gas forcing is thought to have caused grounding-line retreat of marine-based sectors of the Antarctic Ice Sheet (AIS). Such interhemispheric sea-level forcing may explain the synchronous evolution of g...
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ftdatacite:10.1594/pangaea.919498 2023-05-15T14:05:24+02:00 Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 Gomez, Natalya Weber, Michael E Clark, Peter U Mitrovica, Jerry X Han, Holly K 2020 application/zip https://dx.doi.org/10.1594/pangaea.919498 https://doi.pangaea.de/10.1594/PANGAEA.919498 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1038/s41586-020-2916-2 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Collection of Datasets article Collection 2020 ftdatacite https://doi.org/10.1594/pangaea.919498 https://doi.org/10.1038/s41586-020-2916-2 2022-02-09T13:16:26Z Sea-level rise due to ice loss in the Northern Hemisphere in response to insolation and greenhouse gas forcing is thought to have caused grounding-line retreat of marine-based sectors of the Antarctic Ice Sheet (AIS). Such interhemispheric sea-level forcing may explain the synchronous evolution of global ice sheets over ice-age cycles. Recent studies that indicate that the AIS experienced substantial millennial-scale variability during and after the last deglaciation (roughly 20,000 to 9,000 years ago) provide further evidence of this sea-level forcing. However, global sea-level change as a result of mass loss from ice sheets is strongly nonuniform, owing to gravitational, deformational and Earth rotational effects, suggesting that the response of AIS grounding lines to Northern Hemisphere sea-level forcing is more complicated than previously modelled. Here, using an ice-sheet model coupled to a global sea-level model, we show that AIS dynamics are amplified by Northern Hemisphere sea-level forcing. As a result of this interhemispheric interaction, a large or rapid Northern Hemisphere sea-level forcing enhances grounding-line advance and associated mass gain of the AIS during glaciation, and grounding-line retreat and mass loss during deglaciation. Relative to models without these interactions, the inclusion of Northern Hemisphere sea-level forcing in our model increases the volume of the AIS during the Last Glacial Maximum (about 26,000 to 20,000 years ago), triggers an earlier retreat of the grounding line and leads to millennial-scale variability throughout the last deglaciation. These findings are consistent with geologic reconstructions of the extent of the AIS during the Last Glacial Maximum and subsequent ice-sheet retreat, and with relative sea-level change in Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Iceberg* DataCite Metadata Store (German National Library of Science and Technology) Antarctic The Antarctic |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
description |
Sea-level rise due to ice loss in the Northern Hemisphere in response to insolation and greenhouse gas forcing is thought to have caused grounding-line retreat of marine-based sectors of the Antarctic Ice Sheet (AIS). Such interhemispheric sea-level forcing may explain the synchronous evolution of global ice sheets over ice-age cycles. Recent studies that indicate that the AIS experienced substantial millennial-scale variability during and after the last deglaciation (roughly 20,000 to 9,000 years ago) provide further evidence of this sea-level forcing. However, global sea-level change as a result of mass loss from ice sheets is strongly nonuniform, owing to gravitational, deformational and Earth rotational effects, suggesting that the response of AIS grounding lines to Northern Hemisphere sea-level forcing is more complicated than previously modelled. Here, using an ice-sheet model coupled to a global sea-level model, we show that AIS dynamics are amplified by Northern Hemisphere sea-level forcing. As a result of this interhemispheric interaction, a large or rapid Northern Hemisphere sea-level forcing enhances grounding-line advance and associated mass gain of the AIS during glaciation, and grounding-line retreat and mass loss during deglaciation. Relative to models without these interactions, the inclusion of Northern Hemisphere sea-level forcing in our model increases the volume of the AIS during the Last Glacial Maximum (about 26,000 to 20,000 years ago), triggers an earlier retreat of the grounding line and leads to millennial-scale variability throughout the last deglaciation. These findings are consistent with geologic reconstructions of the extent of the AIS during the Last Glacial Maximum and subsequent ice-sheet retreat, and with relative sea-level change in Antarctica. |
format |
Article in Journal/Newspaper |
author |
Gomez, Natalya Weber, Michael E Clark, Peter U Mitrovica, Jerry X Han, Holly K |
spellingShingle |
Gomez, Natalya Weber, Michael E Clark, Peter U Mitrovica, Jerry X Han, Holly K Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
author_facet |
Gomez, Natalya Weber, Michael E Clark, Peter U Mitrovica, Jerry X Han, Holly K |
author_sort |
Gomez, Natalya |
title |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_short |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_full |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_fullStr |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_full_unstemmed |
Marine records of iceberg-rafted debris (IBRD) from sediment cores MD07-3133 and MD07-3134 |
title_sort |
marine records of iceberg-rafted debris (ibrd) from sediment cores md07-3133 and md07-3134 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2020 |
url |
https://dx.doi.org/10.1594/pangaea.919498 https://doi.pangaea.de/10.1594/PANGAEA.919498 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Iceberg* |
op_relation |
https://dx.doi.org/10.1038/s41586-020-2916-2 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.919498 https://doi.org/10.1038/s41586-020-2916-2 |
_version_ |
1766277253550833664 |