Evolution of a coupled marine ice sheet-sea level model
We investigate the stability of marine ice sheets by coupling a gravitationally self-consistent sea level model valid for a self-gravitating, viscoelastically deforming Earth to a 1-D marine ice sheet-shelf model. The evolution of the coupled model is explored for a suite of simulations in which we...
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ftoregonstate:ir.library.oregonstate.edu:9306t076t 2024-04-14T08:13:08+00:00 Evolution of a coupled marine ice sheet-sea level model Gomez, Natalya Pollard, David Mitrovica, Jerry X. Huybers, Peter Clark, Peter U. https://ir.library.oregonstate.edu/concern/articles/9306t076t English [eng] eng unknown American Geophysical Union https://ir.library.oregonstate.edu/concern/articles/9306t076t Copyright Not Evaluated Article ftoregonstate 2024-03-21T15:42:56Z We investigate the stability of marine ice sheets by coupling a gravitationally self-consistent sea level model valid for a self-gravitating, viscoelastically deforming Earth to a 1-D marine ice sheet-shelf model. The evolution of the coupled model is explored for a suite of simulations in which we vary the bed slope and the forcing that initiates retreat. We find that the sea level fall at the grounding line associated with a retreating ice sheet acts to slow the retreat; in simulations with shallow reversed bed slopes and/or small external forcing, the drop in sea level can be sufficient to halt the retreat. The rate of sea level change at the grounding line has an elastic component due to ongoing changes in ice sheet geometry, and a viscous component due to past ice and ocean load changes. When the ice sheet model is forced from steady state, on short timescales (<∼500 years), viscous effects may be ignored and grounding-line migration at a given time will depend on the local bedrock topography and on contemporaneous sea level changes driven by ongoing ice sheet mass flux. On longer timescales, an accurate assessment of the present stability of a marine ice sheet requires knowledge of its past evolution. Article in Journal/Newspaper Ice Sheet ScholarsArchive@OSU (Oregon State University) |
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ScholarsArchive@OSU (Oregon State University) |
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ftoregonstate |
language |
English unknown |
description |
We investigate the stability of marine ice sheets by coupling a gravitationally self-consistent sea level model valid for a self-gravitating, viscoelastically deforming Earth to a 1-D marine ice sheet-shelf model. The evolution of the coupled model is explored for a suite of simulations in which we vary the bed slope and the forcing that initiates retreat. We find that the sea level fall at the grounding line associated with a retreating ice sheet acts to slow the retreat; in simulations with shallow reversed bed slopes and/or small external forcing, the drop in sea level can be sufficient to halt the retreat. The rate of sea level change at the grounding line has an elastic component due to ongoing changes in ice sheet geometry, and a viscous component due to past ice and ocean load changes. When the ice sheet model is forced from steady state, on short timescales (<∼500 years), viscous effects may be ignored and grounding-line migration at a given time will depend on the local bedrock topography and on contemporaneous sea level changes driven by ongoing ice sheet mass flux. On longer timescales, an accurate assessment of the present stability of a marine ice sheet requires knowledge of its past evolution. |
format |
Article in Journal/Newspaper |
author |
Gomez, Natalya Pollard, David Mitrovica, Jerry X. Huybers, Peter Clark, Peter U. |
spellingShingle |
Gomez, Natalya Pollard, David Mitrovica, Jerry X. Huybers, Peter Clark, Peter U. Evolution of a coupled marine ice sheet-sea level model |
author_facet |
Gomez, Natalya Pollard, David Mitrovica, Jerry X. Huybers, Peter Clark, Peter U. |
author_sort |
Gomez, Natalya |
title |
Evolution of a coupled marine ice sheet-sea level model |
title_short |
Evolution of a coupled marine ice sheet-sea level model |
title_full |
Evolution of a coupled marine ice sheet-sea level model |
title_fullStr |
Evolution of a coupled marine ice sheet-sea level model |
title_full_unstemmed |
Evolution of a coupled marine ice sheet-sea level model |
title_sort |
evolution of a coupled marine ice sheet-sea level model |
publisher |
American Geophysical Union |
url |
https://ir.library.oregonstate.edu/concern/articles/9306t076t |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://ir.library.oregonstate.edu/concern/articles/9306t076t |
op_rights |
Copyright Not Evaluated |
_version_ |
1796311055200157696 |