Grounding line stability in a regime of low driving and basal stresses
The dynamics of a marine ice sheet's grounding lines determine the rate of ice discharge from the grounded part of ice sheet into surrounding oceans. In many locations in West Antarctica ice flows into ice shelves through ice streams experiencing low driving stress. However, existing simple the...
Published in: | Journal of Glaciology |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2019
|
Subjects: | |
Online Access: | https://doi.org/10.1017/jog.2019.53 https://doaj.org/article/091b22302d5d4cad8180bbf4c372245f |
id |
ftdoajarticles:oai:doaj.org/article:091b22302d5d4cad8180bbf4c372245f |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:091b22302d5d4cad8180bbf4c372245f 2023-05-15T13:45:41+02:00 Grounding line stability in a regime of low driving and basal stresses O. V. Sergienko D. J. Wingham 2019-10-01T00:00:00Z https://doi.org/10.1017/jog.2019.53 https://doaj.org/article/091b22302d5d4cad8180bbf4c372245f EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000534/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.53 0022-1430 1727-5652 https://doaj.org/article/091b22302d5d4cad8180bbf4c372245f Journal of Glaciology, Vol 65, Pp 833-849 (2019) Ice dynamics ice-sheet modeling ice streams Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2019.53 2023-03-12T01:30:57Z The dynamics of a marine ice sheet's grounding lines determine the rate of ice discharge from the grounded part of ice sheet into surrounding oceans. In many locations in West Antarctica ice flows into ice shelves through ice streams experiencing low driving stress. However, existing simple theories of marine ice sheets are developed under the assumption of high basal and driving stress. Here we analyze the grounding line behavior of marine ice streams experiencing low basal shear and driving stress. We find that in this regime, the ice flux at the grounding line is a complex function of the geometry of the ice-stream bed, net accumulation rate and gradient of the net accumulation rate. Our analysis shows that the stability of distinct steady states is determined by the same parameters, suggesting a more complex (in)stability criterion than what is commonly referred to within the context of the ‘marine ice-sheet instability hypothesis’. We also determine characteristic timescales (e-folding time) of ice-sheet configurations perturbed from their steady states. These timescales can be used to determine whether particular configurations can be considered in isolation from other components of the climate system or whether their effects and feedbacks between the ice sheet and the rest of the climate system have to be taken into account. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Ice Shelves Journal of Glaciology West Antarctica Directory of Open Access Journals: DOAJ Articles West Antarctica Journal of Glaciology 65 253 833 849 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ice dynamics ice-sheet modeling ice streams Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Ice dynamics ice-sheet modeling ice streams Environmental sciences GE1-350 Meteorology. Climatology QC851-999 O. V. Sergienko D. J. Wingham Grounding line stability in a regime of low driving and basal stresses |
topic_facet |
Ice dynamics ice-sheet modeling ice streams Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
The dynamics of a marine ice sheet's grounding lines determine the rate of ice discharge from the grounded part of ice sheet into surrounding oceans. In many locations in West Antarctica ice flows into ice shelves through ice streams experiencing low driving stress. However, existing simple theories of marine ice sheets are developed under the assumption of high basal and driving stress. Here we analyze the grounding line behavior of marine ice streams experiencing low basal shear and driving stress. We find that in this regime, the ice flux at the grounding line is a complex function of the geometry of the ice-stream bed, net accumulation rate and gradient of the net accumulation rate. Our analysis shows that the stability of distinct steady states is determined by the same parameters, suggesting a more complex (in)stability criterion than what is commonly referred to within the context of the ‘marine ice-sheet instability hypothesis’. We also determine characteristic timescales (e-folding time) of ice-sheet configurations perturbed from their steady states. These timescales can be used to determine whether particular configurations can be considered in isolation from other components of the climate system or whether their effects and feedbacks between the ice sheet and the rest of the climate system have to be taken into account. |
format |
Article in Journal/Newspaper |
author |
O. V. Sergienko D. J. Wingham |
author_facet |
O. V. Sergienko D. J. Wingham |
author_sort |
O. V. Sergienko |
title |
Grounding line stability in a regime of low driving and basal stresses |
title_short |
Grounding line stability in a regime of low driving and basal stresses |
title_full |
Grounding line stability in a regime of low driving and basal stresses |
title_fullStr |
Grounding line stability in a regime of low driving and basal stresses |
title_full_unstemmed |
Grounding line stability in a regime of low driving and basal stresses |
title_sort |
grounding line stability in a regime of low driving and basal stresses |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2019.53 https://doaj.org/article/091b22302d5d4cad8180bbf4c372245f |
geographic |
West Antarctica |
geographic_facet |
West Antarctica |
genre |
Antarc* Antarctica Ice Sheet Ice Shelves Journal of Glaciology West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet Ice Shelves Journal of Glaciology West Antarctica |
op_source |
Journal of Glaciology, Vol 65, Pp 833-849 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000534/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.53 0022-1430 1727-5652 https://doaj.org/article/091b22302d5d4cad8180bbf4c372245f |
op_doi |
https://doi.org/10.1017/jog.2019.53 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
253 |
container_start_page |
833 |
op_container_end_page |
849 |
_version_ |
1766229815384342528 |