Sea-level trends across The Bahamas constrain peak last interglacial ice melt
During the last interglacial (LIG) period, global mean sea level (GMSL) was higher than at present, likely driven by greater high-latitude insolation. Past sea-level estimates require elevation measurements and age determination of marine sediments that formed at or near sea level, and those elevati...
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Online Access: | http://hdl.handle.net/10278/3747448 https://doi.org/10.1073/pnas.2026839118 |
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ftuniveneziairis:oai:iris.unive.it:10278/3747448 2024-04-14T08:04:18+00:00 Sea-level trends across The Bahamas constrain peak last interglacial ice melt Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. 2021 http://hdl.handle.net/10278/3747448 https://doi.org/10.1073/pnas.2026839118 unknown info:eu-repo/semantics/altIdentifier/wos/WOS:000687404200002 volume:118 issue:33 firstpage:e2026839118 journal:PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA info:eu-repo/grantAgreement/EC/H2020/802414 http://hdl.handle.net/10278/3747448 doi:10.1073/pnas.2026839118 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85112318856 Settore GEO/04 - Geografia Fisica e Geomorfologia info:eu-repo/semantics/article 2021 ftuniveneziairis https://doi.org/10.1073/pnas.2026839118 2024-03-21T18:20:11Z During the last interglacial (LIG) period, global mean sea level (GMSL) was higher than at present, likely driven by greater high-latitude insolation. Past sea-level estimates require elevation measurements and age determination of marine sediments that formed at or near sea level, and those elevations must be corrected for glacial isostatic adjustment (GIA). However, this GIA correction is subject to uncertainties in the GIA model inputs, namely, Earth’s rheology and past ice history, which reduces precision and accuracy in estimates of past GMSL. To better constrain the GIA process, we compare our data and existing LIG sea-level data across the Bahamian archipelago with a suite of 576 GIA model predictions. We calculated weights for each GIA model based on how well the model fits spatial trends in the regional sea-level data and then used the weighted GIA corrections to revise estimates of GMSL during the LIG. During the LIG, we find a 95% probability that global sea level peaked at least 1.2 m higher than today, and it is very unlikely (5% probability) to have exceeded 5.3 m. Estimates increase by up to 30% (decrease by up to 20%) for portions of melt that originate from the Greenland ice sheet (West Antarctic ice sheet). Altogether, this work suggests that LIG GMSL may be lower than previously assumed. Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic West Antarctic Ice Sheet Greenland Proceedings of the National Academy of Sciences 118 33 e2026839118 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
unknown |
topic |
Settore GEO/04 - Geografia Fisica e Geomorfologia |
spellingShingle |
Settore GEO/04 - Geografia Fisica e Geomorfologia Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
topic_facet |
Settore GEO/04 - Geografia Fisica e Geomorfologia |
description |
During the last interglacial (LIG) period, global mean sea level (GMSL) was higher than at present, likely driven by greater high-latitude insolation. Past sea-level estimates require elevation measurements and age determination of marine sediments that formed at or near sea level, and those elevations must be corrected for glacial isostatic adjustment (GIA). However, this GIA correction is subject to uncertainties in the GIA model inputs, namely, Earth’s rheology and past ice history, which reduces precision and accuracy in estimates of past GMSL. To better constrain the GIA process, we compare our data and existing LIG sea-level data across the Bahamian archipelago with a suite of 576 GIA model predictions. We calculated weights for each GIA model based on how well the model fits spatial trends in the regional sea-level data and then used the weighted GIA corrections to revise estimates of GMSL during the LIG. During the LIG, we find a 95% probability that global sea level peaked at least 1.2 m higher than today, and it is very unlikely (5% probability) to have exceeded 5.3 m. Estimates increase by up to 30% (decrease by up to 20%) for portions of melt that originate from the Greenland ice sheet (West Antarctic ice sheet). Altogether, this work suggests that LIG GMSL may be lower than previously assumed. |
author2 |
Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. |
format |
Article in Journal/Newspaper |
author |
Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. |
author_facet |
Dyer, Blake Austermann, Jacqueline D’Andrea, William J. Creel, Roger C. Sandstrom, Michael R. Cashman, Miranda Rovere, Alessio Raymo, Maureen E. |
author_sort |
Dyer, Blake |
title |
Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
title_short |
Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
title_full |
Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
title_fullStr |
Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
title_full_unstemmed |
Sea-level trends across The Bahamas constrain peak last interglacial ice melt |
title_sort |
sea-level trends across the bahamas constrain peak last interglacial ice melt |
publishDate |
2021 |
url |
http://hdl.handle.net/10278/3747448 https://doi.org/10.1073/pnas.2026839118 |
geographic |
Antarctic West Antarctic Ice Sheet Greenland |
geographic_facet |
Antarctic West Antarctic Ice Sheet Greenland |
genre |
Antarc* Antarctic Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000687404200002 volume:118 issue:33 firstpage:e2026839118 journal:PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA info:eu-repo/grantAgreement/EC/H2020/802414 http://hdl.handle.net/10278/3747448 doi:10.1073/pnas.2026839118 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85112318856 |
op_doi |
https://doi.org/10.1073/pnas.2026839118 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
118 |
container_issue |
33 |
container_start_page |
e2026839118 |
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