Persistence and variability of ice-stream grounding lines on retrograde bed slopes
In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow. However, the potential for such variations in basal properties is not considered by conventio...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2016
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-10-1883-2016 https://noa.gwlb.de/receive/cop_mods_00011552 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011509/tc-10-1883-2016.pdf https://tc.copernicus.org/articles/10/1883/2016/tc-10-1883-2016.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011552 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011552 2023-05-15T13:34:49+02:00 Persistence and variability of ice-stream grounding lines on retrograde bed slopes Robel, Alexander A. Schoof, Christian Tziperman, Eli 2016-08 electronic https://doi.org/10.5194/tc-10-1883-2016 https://noa.gwlb.de/receive/cop_mods_00011552 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011509/tc-10-1883-2016.pdf https://tc.copernicus.org/articles/10/1883/2016/tc-10-1883-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1883-2016 https://noa.gwlb.de/receive/cop_mods_00011552 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011509/tc-10-1883-2016.pdf https://tc.copernicus.org/articles/10/1883/2016/tc-10-1883-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-1883-2016 2022-02-08T22:56:28Z In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow. However, the potential for such variations in basal properties is not considered by conventional theories of grounding-line stability on retrograde bed slopes, which assume that bed properties are static in time. Using a flow-line model, we show how internally generated, transient variations in ice-stream state interact with retrograde bed slopes. In contrast to predictions from the theory of the marine ice-sheet instability, our simulated grounding line is able to persist and reverse direction of migration on a retrograde bed when undergoing oscillations in the grounding-line position. In turn, the presence of a retrograde bed may also suppress or reduce the amplitude of internal oscillations in ice-stream state. We explore the physical mechanisms responsible for these behaviors and discuss the implications for observed grounding-line migration in West Antarctica. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica Niedersächsisches Online-Archiv NOA West Antarctica The Cryosphere 10 4 1883 1896 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Robel, Alexander A. Schoof, Christian Tziperman, Eli Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
topic_facet |
article Verlagsveröffentlichung |
description |
In many ice streams, basal resistance varies in space and time due to the dynamically evolving properties of subglacial till. These variations can cause internally generated oscillations in ice-stream flow. However, the potential for such variations in basal properties is not considered by conventional theories of grounding-line stability on retrograde bed slopes, which assume that bed properties are static in time. Using a flow-line model, we show how internally generated, transient variations in ice-stream state interact with retrograde bed slopes. In contrast to predictions from the theory of the marine ice-sheet instability, our simulated grounding line is able to persist and reverse direction of migration on a retrograde bed when undergoing oscillations in the grounding-line position. In turn, the presence of a retrograde bed may also suppress or reduce the amplitude of internal oscillations in ice-stream state. We explore the physical mechanisms responsible for these behaviors and discuss the implications for observed grounding-line migration in West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Robel, Alexander A. Schoof, Christian Tziperman, Eli |
author_facet |
Robel, Alexander A. Schoof, Christian Tziperman, Eli |
author_sort |
Robel, Alexander A. |
title |
Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
title_short |
Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
title_full |
Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
title_fullStr |
Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
title_full_unstemmed |
Persistence and variability of ice-stream grounding lines on retrograde bed slopes |
title_sort |
persistence and variability of ice-stream grounding lines on retrograde bed slopes |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-1883-2016 https://noa.gwlb.de/receive/cop_mods_00011552 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011509/tc-10-1883-2016.pdf https://tc.copernicus.org/articles/10/1883/2016/tc-10-1883-2016.pdf |
geographic |
West Antarctica |
geographic_facet |
West Antarctica |
genre |
Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet The Cryosphere West Antarctica |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1883-2016 https://noa.gwlb.de/receive/cop_mods_00011552 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011509/tc-10-1883-2016.pdf https://tc.copernicus.org/articles/10/1883/2016/tc-10-1883-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-1883-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
4 |
container_start_page |
1883 |
op_container_end_page |
1896 |
_version_ |
1766057827346939904 |