A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship
Abstract A finite-element solution of the time-dependent mass-continuity equation for column-averaged ice-sheet flow and sliding is applied to the Antarctic ice sheet. First, a calibration of the model to the steady-state present ice-sheet configuration is presented. With fitted values of the parame...
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Cambridge University Press (CUP)
1994
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Online Access: | http://dx.doi.org/10.1017/s0022143000003944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003944 |
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crcambridgeupr:10.1017/s0022143000003944 2024-03-03T08:38:17+00:00 A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship Fastook, James L. Mike, Prentice 1994 http://dx.doi.org/10.1017/s0022143000003944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003944 en eng Cambridge University Press (CUP) Journal of Glaciology volume 40, issue 134, page 167-175 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1994 crcambridgeupr https://doi.org/10.1017/s0022143000003944 2024-02-08T08:34:04Z Abstract A finite-element solution of the time-dependent mass-continuity equation for column-averaged ice-sheet flow and sliding is applied to the Antarctic ice sheet. First, a calibration of the model to the steady-state present ice-sheet configuration is presented. With fitted values of the parameters describing the regions of sliding, the degree of bed coupling and the ice hardness, a change in the mean annual sea-level temperature is used to simulate variation of the climatic conditions over Antarctica for both warming and cooling of the climate. Paradoxically, a climate warming of up to 9 deg leads to an increase in ice volume, while cooling leads to decreasing ice volume as long as the present margins of Antarctica are maintained. Some extreme simulations of the Antarctic ice sheet for “maximum over-riding” and “minimum warm climate” are shown for situations where the present bed conditions are altered. Finally, a time-dependent simulation shows the response of the ice-sheet system to cyclical variations in the simulated climate, demonstrating the lag of the ice-sheet response to be approximately 2700 years. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology Cambridge University Press Antarctic The Antarctic Journal of Glaciology 40 134 167 175 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Fastook, James L. Mike, Prentice A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
topic_facet |
Earth-Surface Processes |
description |
Abstract A finite-element solution of the time-dependent mass-continuity equation for column-averaged ice-sheet flow and sliding is applied to the Antarctic ice sheet. First, a calibration of the model to the steady-state present ice-sheet configuration is presented. With fitted values of the parameters describing the regions of sliding, the degree of bed coupling and the ice hardness, a change in the mean annual sea-level temperature is used to simulate variation of the climatic conditions over Antarctica for both warming and cooling of the climate. Paradoxically, a climate warming of up to 9 deg leads to an increase in ice volume, while cooling leads to decreasing ice volume as long as the present margins of Antarctica are maintained. Some extreme simulations of the Antarctic ice sheet for “maximum over-riding” and “minimum warm climate” are shown for situations where the present bed conditions are altered. Finally, a time-dependent simulation shows the response of the ice-sheet system to cyclical variations in the simulated climate, demonstrating the lag of the ice-sheet response to be approximately 2700 years. |
format |
Article in Journal/Newspaper |
author |
Fastook, James L. Mike, Prentice |
author_facet |
Fastook, James L. Mike, Prentice |
author_sort |
Fastook, James L. |
title |
A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
title_short |
A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
title_full |
A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
title_fullStr |
A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
title_full_unstemmed |
A Finite-element Model of Antarctica: sensitivity test for meteorological mass-balance relationship |
title_sort |
finite-element model of antarctica: sensitivity test for meteorological mass-balance relationship |
publisher |
Cambridge University Press (CUP) |
publishDate |
1994 |
url |
http://dx.doi.org/10.1017/s0022143000003944 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003944 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 40, issue 134, page 167-175 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000003944 |
container_title |
Journal of Glaciology |
container_volume |
40 |
container_issue |
134 |
container_start_page |
167 |
op_container_end_page |
175 |
_version_ |
1792506193506205696 |