A numerical study of cyclic behaviour of polar ice sheets
Possible cyclic behaviour of polar ice sheets is studied with a numerical ice-flow model. The model includes a calculation of bedrock adjustment and temperature field in the ice sheet. Basal water is traced and affects ice-mass discharge. Relaxation oscillations occur only for low ice-accumulation r...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
1983
|
Subjects: | |
Online Access: | https://dspace.library.uu.nl/handle/1874/22119 |
id |
ftunivutrecht:oai:dspace.library.uu.nl:1874/22119 |
---|---|
record_format |
openpolar |
spelling |
ftunivutrecht:oai:dspace.library.uu.nl:1874/22119 2023-07-23T04:19:48+02:00 A numerical study of cyclic behaviour of polar ice sheets Oerlemans, J. 1983 image/pdf https://dspace.library.uu.nl/handle/1874/22119 en eng https://dspace.library.uu.nl/handle/1874/22119 info:eu-repo/semantics/OpenAccess Natuur- en Sterrenkunde Article 1983 ftunivutrecht 2023-07-01T23:20:17Z Possible cyclic behaviour of polar ice sheets is studied with a numerical ice-flow model. The model includes a calculation of bedrock adjustment and temperature field in the ice sheet. Basal water is traced and affects ice-mass discharge. Relaxation oscillations occur only for low ice-accumulation rates (less than 5 cm ice depth per year). For larger ice-accumulation rates, 2 steady-state regimes exist, depending on temperature: an ice sheet frozen to the bottom, and an ice sheet subject to basal melting everywhere. The volume of the latter is considerably smaller (about 65% of that of the "cold sheet"). In general, the mean basal ice temperature decreases with increasing ice accumulation rate. This is due to the advection term in the heat equation (which has been ignored in earlier studies of ice-sheet surging). Article in Journal/Newspaper Ice Sheet Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Natuur- en Sterrenkunde |
spellingShingle |
Natuur- en Sterrenkunde Oerlemans, J. A numerical study of cyclic behaviour of polar ice sheets |
topic_facet |
Natuur- en Sterrenkunde |
description |
Possible cyclic behaviour of polar ice sheets is studied with a numerical ice-flow model. The model includes a calculation of bedrock adjustment and temperature field in the ice sheet. Basal water is traced and affects ice-mass discharge. Relaxation oscillations occur only for low ice-accumulation rates (less than 5 cm ice depth per year). For larger ice-accumulation rates, 2 steady-state regimes exist, depending on temperature: an ice sheet frozen to the bottom, and an ice sheet subject to basal melting everywhere. The volume of the latter is considerably smaller (about 65% of that of the "cold sheet"). In general, the mean basal ice temperature decreases with increasing ice accumulation rate. This is due to the advection term in the heat equation (which has been ignored in earlier studies of ice-sheet surging). |
format |
Article in Journal/Newspaper |
author |
Oerlemans, J. |
author_facet |
Oerlemans, J. |
author_sort |
Oerlemans, J. |
title |
A numerical study of cyclic behaviour of polar ice sheets |
title_short |
A numerical study of cyclic behaviour of polar ice sheets |
title_full |
A numerical study of cyclic behaviour of polar ice sheets |
title_fullStr |
A numerical study of cyclic behaviour of polar ice sheets |
title_full_unstemmed |
A numerical study of cyclic behaviour of polar ice sheets |
title_sort |
numerical study of cyclic behaviour of polar ice sheets |
publishDate |
1983 |
url |
https://dspace.library.uu.nl/handle/1874/22119 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://dspace.library.uu.nl/handle/1874/22119 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772183212757352448 |