Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model
Simulations of ice sheet evolution over glacial cycles require integration of observational constraints using ensemble studies with fast ice sheet models. These include physical parameterisations with uncertainties, for example, relating to grounding-line migration. More complete ice dynamic models...
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2020
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ftdoajarticles:oai:doaj.org/article:85efe26affc54d8494ad34224d637f95 2023-05-15T13:38:57+02:00 Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model C. Schannwell R. Drews T. A. Ehlers O. Eisen C. Mayer M. Malinen E. C. Smith H. Eisermann 2020-11-01T00:00:00Z https://doi.org/10.5194/tc-14-3917-2020 https://doaj.org/article/85efe26affc54d8494ad34224d637f95 EN eng Copernicus Publications https://tc.copernicus.org/articles/14/3917/2020/tc-14-3917-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3917-2020 1994-0416 1994-0424 https://doaj.org/article/85efe26affc54d8494ad34224d637f95 The Cryosphere, Vol 14, Pp 3917-3934 (2020) Environmental sciences GE1-350 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.5194/tc-14-3917-2020 2022-12-31T12:01:25Z Simulations of ice sheet evolution over glacial cycles require integration of observational constraints using ensemble studies with fast ice sheet models. These include physical parameterisations with uncertainties, for example, relating to grounding-line migration. More complete ice dynamic models are slow and have thus far only be applied for < 1000 years, leaving many model parameters unconstrained. Here we apply a 3D thermomechanically coupled full-Stokes ice sheet model to the Ekström Ice Shelf embayment, East Antarctica, over a full glacial cycle (40 000 years). We test the model response to differing ocean bed properties that provide an envelope of potential ocean substrates seawards of today's grounding line. The end-member scenarios include a hard, high-friction ocean bed and a soft, low-friction ocean bed. We find that predicted ice volumes differ by > 50 % under almost equal forcing. Grounding-line positions differ by up to 49 km, show significant hysteresis, and migrate non-steadily in both scenarios with long quiescent phases disrupted by leaps of rapid migration. The simulations quantify the evolution of two different ice sheet geometries (namely thick and slow vs. thin and fast), triggered by the variable grounding-line migration over the differing ocean beds. Our study extends the timescales of 3D full-Stokes by an order of magnitude compared to previous studies with the help of parallelisation. The extended time frame for full-Stokes models is a first step towards better understanding other processes such as erosion and sediment redistribution in the ice shelf cavity impacting the entire catchment geometry. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf The Cryosphere Directory of Open Access Journals: DOAJ Articles East Antarctica Ekström Ice Shelf ENVELOPE(-8.000,-8.000,-71.000,-71.000) The Cryosphere 14 11 3917 3934 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 C. Schannwell R. Drews T. A. Ehlers O. Eisen C. Mayer M. Malinen E. C. Smith H. Eisermann Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Simulations of ice sheet evolution over glacial cycles require integration of observational constraints using ensemble studies with fast ice sheet models. These include physical parameterisations with uncertainties, for example, relating to grounding-line migration. More complete ice dynamic models are slow and have thus far only be applied for < 1000 years, leaving many model parameters unconstrained. Here we apply a 3D thermomechanically coupled full-Stokes ice sheet model to the Ekström Ice Shelf embayment, East Antarctica, over a full glacial cycle (40 000 years). We test the model response to differing ocean bed properties that provide an envelope of potential ocean substrates seawards of today's grounding line. The end-member scenarios include a hard, high-friction ocean bed and a soft, low-friction ocean bed. We find that predicted ice volumes differ by > 50 % under almost equal forcing. Grounding-line positions differ by up to 49 km, show significant hysteresis, and migrate non-steadily in both scenarios with long quiescent phases disrupted by leaps of rapid migration. The simulations quantify the evolution of two different ice sheet geometries (namely thick and slow vs. thin and fast), triggered by the variable grounding-line migration over the differing ocean beds. Our study extends the timescales of 3D full-Stokes by an order of magnitude compared to previous studies with the help of parallelisation. The extended time frame for full-Stokes models is a first step towards better understanding other processes such as erosion and sediment redistribution in the ice shelf cavity impacting the entire catchment geometry. |
format |
Article in Journal/Newspaper |
author |
C. Schannwell R. Drews T. A. Ehlers O. Eisen C. Mayer M. Malinen E. C. Smith H. Eisermann |
author_facet |
C. Schannwell R. Drews T. A. Ehlers O. Eisen C. Mayer M. Malinen E. C. Smith H. Eisermann |
author_sort |
C. Schannwell |
title |
Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
title_short |
Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
title_full |
Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
title_fullStr |
Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
title_full_unstemmed |
Quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-Stokes model |
title_sort |
quantifying the effect of ocean bed properties on ice sheet geometry over 40 000 years with a full-stokes model |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-3917-2020 https://doaj.org/article/85efe26affc54d8494ad34224d637f95 |
long_lat |
ENVELOPE(-8.000,-8.000,-71.000,-71.000) |
geographic |
East Antarctica Ekström Ice Shelf |
geographic_facet |
East Antarctica Ekström Ice Shelf |
genre |
Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf The Cryosphere |
genre_facet |
Antarc* Antarctica East Antarctica Ice Sheet Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 3917-3934 (2020) |
op_relation |
https://tc.copernicus.org/articles/14/3917/2020/tc-14-3917-2020.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-14-3917-2020 1994-0416 1994-0424 https://doaj.org/article/85efe26affc54d8494ad34224d637f95 |
op_doi |
https://doi.org/10.5194/tc-14-3917-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
11 |
container_start_page |
3917 |
op_container_end_page |
3934 |
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1766112821372780544 |