Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland
The solid earth influences ice sheet dynamics by controlling bedrock deformation and hence surface elevation and grounding line position. These in turn determine surface and basal melt. Ice-sheet models typically include models to compute bedrock deformation with a constant mantle viscosity (or simi...
Main Authors: | , , , , |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
2023
|
Subjects: | |
Online Access: | https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020579 |
id |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020579 |
---|---|
record_format |
openpolar |
spelling |
ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5020579 2023-07-23T04:15:38+02:00 Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland van Calcar, C. Van Der Wal, W. Kempenaar, G. Barletta, V. van de Wal, R. 2023-07-11 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020579 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3121 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020579 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-3121 2023-07-02T23:40:09Z The solid earth influences ice sheet dynamics by controlling bedrock deformation and hence surface elevation and grounding line position. These in turn determine surface and basal melt. Ice-sheet models typically include models to compute bedrock deformation with a constant mantle viscosity (or similar parameter), whereas mantle viscosity can vary strongly underneath the ice sheets. Here we use a recently developed model that couples an ice-sheet model (ANICE) to a finite-element based GIA model that includes 3D variations in viscosity derived from seismic measurements. We investigate the effect of mantle viscosity variations on the evolution of the last glacial ice sheets in Antarctica and Greenland. In Antarctica, the main feedback mechanism is the effect of bedrock elevation on local sea level and grounding line position. In particular, uplifting bedrock in marine ice sheets reduces ice sheet loss during deglaciation. Results show a grounding line position that is 500 km more outwards when including 3D variations in mantle viscosity compared to a homogeneous viscosity. In Greenland, the main feedback is the effect of bedrock elevation on the surface elevation and hence surface melt. We show that this feedback mainly manifests in north-west Greenland where the mantle viscosity is above average. The higher mantle viscosity leads to higher ice sheet elevation at last glacial maximum, which leads to less surface melt during deglaciation. The results underline the importance of including 3D viscosity in modeling ice sheet evolution. Conference Object Antarc* Antarctica Greenland Ice Sheet GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The solid earth influences ice sheet dynamics by controlling bedrock deformation and hence surface elevation and grounding line position. These in turn determine surface and basal melt. Ice-sheet models typically include models to compute bedrock deformation with a constant mantle viscosity (or similar parameter), whereas mantle viscosity can vary strongly underneath the ice sheets. Here we use a recently developed model that couples an ice-sheet model (ANICE) to a finite-element based GIA model that includes 3D variations in viscosity derived from seismic measurements. We investigate the effect of mantle viscosity variations on the evolution of the last glacial ice sheets in Antarctica and Greenland. In Antarctica, the main feedback mechanism is the effect of bedrock elevation on local sea level and grounding line position. In particular, uplifting bedrock in marine ice sheets reduces ice sheet loss during deglaciation. Results show a grounding line position that is 500 km more outwards when including 3D variations in mantle viscosity compared to a homogeneous viscosity. In Greenland, the main feedback is the effect of bedrock elevation on the surface elevation and hence surface melt. We show that this feedback mainly manifests in north-west Greenland where the mantle viscosity is above average. The higher mantle viscosity leads to higher ice sheet elevation at last glacial maximum, which leads to less surface melt during deglaciation. The results underline the importance of including 3D viscosity in modeling ice sheet evolution. |
format |
Conference Object |
author |
van Calcar, C. Van Der Wal, W. Kempenaar, G. Barletta, V. van de Wal, R. |
spellingShingle |
van Calcar, C. Van Der Wal, W. Kempenaar, G. Barletta, V. van de Wal, R. Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
author_facet |
van Calcar, C. Van Der Wal, W. Kempenaar, G. Barletta, V. van de Wal, R. |
author_sort |
van Calcar, C. |
title |
Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
title_short |
Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
title_full |
Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
title_fullStr |
Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
title_full_unstemmed |
Ice sheet – solid earth feedback during the last glacial cycle in Antarctica and Greenland |
title_sort |
ice sheet – solid earth feedback during the last glacial cycle in antarctica and greenland |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020579 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctica Greenland Ice Sheet |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-3121 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020579 |
op_doi |
https://doi.org/10.57757/IUGG23-3121 |
_version_ |
1772176517162336256 |