Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction
One of the most common ways to assess ice-sheet reconstructions of the past is to evaluate how they impact changes in sea level through glacial isostatic adjustment. PaleoMIST 1.0, a preliminary reconstruction of topography and ice sheets during the past 80 000 years, was created without a rigorous...
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Geological Survey of Denmark and Greenland (GEUS)
2023
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ftjgeusbullet:oai:geusjournals.org:article/8355 2024-09-15T18:08:22+00:00 Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction Gowan, Evan J Greenland 2023-11-13 application/pdf text/xml text/html application/epub+zip https://geusbulletin.org/index.php/geusb/article/view/8355 https://doi.org/10.34194/geusb.v53.8355 eng eng Geological Survey of Denmark and Greenland (GEUS) https://geusbulletin.org/index.php/geusb/article/view/8355/14393 https://geusbulletin.org/index.php/geusb/article/view/8355/14392 https://geusbulletin.org/index.php/geusb/article/view/8355/14390 https://geusbulletin.org/index.php/geusb/article/view/8355/14391 https://geusbulletin.org/index.php/geusb/article/view/8355/14394 https://geusbulletin.org/index.php/geusb/article/view/8355 doi:10.34194/geusb.v53.8355 Copyright (c) 2023 Evan J Gowan https://creativecommons.org/licenses/by/4.0 GEUS Bulletin; Vol. 53 (2023): Annual Volume 2023 2597-2154 2597-2162 10.34194/geusb.v53i Glacial isostatic adjustment Ice sheets Sea level Holocene Model-data comparison Climate change Earth Science info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article. 2023 ftjgeusbullet https://doi.org/10.34194/geusb.v53.835510.34194/geusb.v53i 2024-06-23T23:34:47Z One of the most common ways to assess ice-sheet reconstructions of the past is to evaluate how they impact changes in sea level through glacial isostatic adjustment. PaleoMIST 1.0, a preliminary reconstruction of topography and ice sheets during the past 80 000 years, was created without a rigorous comparison with past sea-level indicators and proxies in Greenland. The basal shear stress values for the Greenland ice sheet were deduced from the present day ice-sheet configuration, which were used for the entire 80 000 years without modification. The margin chronology was based on previous reconstructions and interpolation between them. As a result, it was not known if the Greenland component was representative of its ice-sheet history. In this study, I compile sea–level proxy data into the Global Archive of Paleo Sea Level Indicators and Proxies (GAPSLIP) database and use them to evaluate the PaleoMIST 1.0 reconstruction. The Last Glacial Maximum (c.20 000 years before present) contribution to sea level in PaleoMIST 1.0 is about 3.5 m, intermediate of other reconstructions of the Greenland ice sheet. The results of the data-model comparison show that PaleoMIST requires a larger pre-Holocene ice volume than it currently has to match the sea-level highstands observed around Greenland, especially in southern Greenland. Some of this mismatch is likely because of the crude 2500 year time step used in the margin reconstruction and the limited Last Glacial Maximum extent. Much of the mismatch can also be mitigated if different Earth model structures, particularly a thinner lithosphere, are assumed. Additional ice in Greenland would contribute to increasing the 3–5 m mismatch between the modelled far-field sea level at the Last Glacial Maximum and proxies in PaleoMIST 1.0. Article in Journal/Newspaper Greenland Ice Sheet GEUS Bulletin (Geological Survey of Denmark and Greenland) |
institution |
Open Polar |
collection |
GEUS Bulletin (Geological Survey of Denmark and Greenland) |
op_collection_id |
ftjgeusbullet |
language |
English |
topic |
Glacial isostatic adjustment Ice sheets Sea level Holocene Model-data comparison Climate change Earth Science |
spellingShingle |
Glacial isostatic adjustment Ice sheets Sea level Holocene Model-data comparison Climate change Earth Science Gowan, Evan J Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
topic_facet |
Glacial isostatic adjustment Ice sheets Sea level Holocene Model-data comparison Climate change Earth Science |
description |
One of the most common ways to assess ice-sheet reconstructions of the past is to evaluate how they impact changes in sea level through glacial isostatic adjustment. PaleoMIST 1.0, a preliminary reconstruction of topography and ice sheets during the past 80 000 years, was created without a rigorous comparison with past sea-level indicators and proxies in Greenland. The basal shear stress values for the Greenland ice sheet were deduced from the present day ice-sheet configuration, which were used for the entire 80 000 years without modification. The margin chronology was based on previous reconstructions and interpolation between them. As a result, it was not known if the Greenland component was representative of its ice-sheet history. In this study, I compile sea–level proxy data into the Global Archive of Paleo Sea Level Indicators and Proxies (GAPSLIP) database and use them to evaluate the PaleoMIST 1.0 reconstruction. The Last Glacial Maximum (c.20 000 years before present) contribution to sea level in PaleoMIST 1.0 is about 3.5 m, intermediate of other reconstructions of the Greenland ice sheet. The results of the data-model comparison show that PaleoMIST requires a larger pre-Holocene ice volume than it currently has to match the sea-level highstands observed around Greenland, especially in southern Greenland. Some of this mismatch is likely because of the crude 2500 year time step used in the margin reconstruction and the limited Last Glacial Maximum extent. Much of the mismatch can also be mitigated if different Earth model structures, particularly a thinner lithosphere, are assumed. Additional ice in Greenland would contribute to increasing the 3–5 m mismatch between the modelled far-field sea level at the Last Glacial Maximum and proxies in PaleoMIST 1.0. |
format |
Article in Journal/Newspaper |
author |
Gowan, Evan J |
author_facet |
Gowan, Evan J |
author_sort |
Gowan, Evan J |
title |
Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
title_short |
Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
title_full |
Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
title_fullStr |
Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
title_full_unstemmed |
Paleo sea-level indicators and proxies from Greenland in the GAPSLIP database and comparison with modelled sea level from the PaleoMIST ice-sheet reconstruction |
title_sort |
paleo sea-level indicators and proxies from greenland in the gapslip database and comparison with modelled sea level from the paleomist ice-sheet reconstruction |
publisher |
Geological Survey of Denmark and Greenland (GEUS) |
publishDate |
2023 |
url |
https://geusbulletin.org/index.php/geusb/article/view/8355 https://doi.org/10.34194/geusb.v53.8355 |
op_coverage |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
GEUS Bulletin; Vol. 53 (2023): Annual Volume 2023 2597-2154 2597-2162 10.34194/geusb.v53i |
op_relation |
https://geusbulletin.org/index.php/geusb/article/view/8355/14393 https://geusbulletin.org/index.php/geusb/article/view/8355/14392 https://geusbulletin.org/index.php/geusb/article/view/8355/14390 https://geusbulletin.org/index.php/geusb/article/view/8355/14391 https://geusbulletin.org/index.php/geusb/article/view/8355/14394 https://geusbulletin.org/index.php/geusb/article/view/8355 doi:10.34194/geusb.v53.8355 |
op_rights |
Copyright (c) 2023 Evan J Gowan https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.34194/geusb.v53.835510.34194/geusb.v53i |
_version_ |
1810445715808190464 |