Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet
Changes in the flow of ice stream C likely indicate a continuing slow drawdown of the Siple Coast of West Antarctica rather than a stabilizing feedback. The downglacier part of ice stream C, West Antarctica largely stagnated over the last few centuries, while upglacier regions continue to flow vigor...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.366.9711 2023-05-15T13:56:12+02:00 Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet S Anandakrishnan Rb Alley Rw Jacobel H Conway The Pennsylvania State University CiteSeerX Archives 1999 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.9711 http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.9711 http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf text 1999 ftciteseerx 2016-01-08T01:05:42Z Changes in the flow of ice stream C likely indicate a continuing slow drawdown of the Siple Coast of West Antarctica rather than a stabilizing feedback. The downglacier part of ice stream C, West Antarctica largely stagnated over the last few centuries, while upglacier regions continue to flow vigorously. Stagnation likely occurred near Siple Dome before the entirety of the downglacier part slowed. Numerous data sets show that the slow-moving part of the ice stream is restrained largely by small, localized basal “sticky spots”. The sticky spots are separated by extensive regions of soft till containing high-pressure liquid water. The soft till slows the transmission of ice-flow changes caused by microearthquakes or by tide-height in the Ross Sea, suggestive of viscous behavior. Near the transition from fast-moving well-lubricated ice to slow-moving ice with basal seismicity, a hydrologic potential map indicates that basal water flowing in from the catchment is diverted away from the slow-moving ice to ice stream B. This diversion could have been caused by a flattening of the surface slope over time in response to the headward growth of ice stream C drawing down the inland ice. Previous mass-balance estimates indicate that the combined B-C drainage most likely is thinning slowly, similar to the rest of the Siple Coast, and consistent with the inland water continuing to lubricate fast ice flow, but now concentrated in ice stream B. Text Antarc* Antarctic Antarctica Ice Sheet Ice Stream B Ice Stream C Ross Sea West Antarctica Unknown Antarctic Ross Sea West Antarctica West Antarctic Ice Sheet Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) Siple Coast ENVELOPE(-155.000,-155.000,-82.000,-82.000) |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Changes in the flow of ice stream C likely indicate a continuing slow drawdown of the Siple Coast of West Antarctica rather than a stabilizing feedback. The downglacier part of ice stream C, West Antarctica largely stagnated over the last few centuries, while upglacier regions continue to flow vigorously. Stagnation likely occurred near Siple Dome before the entirety of the downglacier part slowed. Numerous data sets show that the slow-moving part of the ice stream is restrained largely by small, localized basal “sticky spots”. The sticky spots are separated by extensive regions of soft till containing high-pressure liquid water. The soft till slows the transmission of ice-flow changes caused by microearthquakes or by tide-height in the Ross Sea, suggestive of viscous behavior. Near the transition from fast-moving well-lubricated ice to slow-moving ice with basal seismicity, a hydrologic potential map indicates that basal water flowing in from the catchment is diverted away from the slow-moving ice to ice stream B. This diversion could have been caused by a flattening of the surface slope over time in response to the headward growth of ice stream C drawing down the inland ice. Previous mass-balance estimates indicate that the combined B-C drainage most likely is thinning slowly, similar to the rest of the Siple Coast, and consistent with the inland water continuing to lubricate fast ice flow, but now concentrated in ice stream B. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
S Anandakrishnan Rb Alley Rw Jacobel H Conway |
spellingShingle |
S Anandakrishnan Rb Alley Rw Jacobel H Conway Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
author_facet |
S Anandakrishnan Rb Alley Rw Jacobel H Conway |
author_sort |
S Anandakrishnan |
title |
Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
title_short |
Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
title_full |
Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
title_fullStr |
Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
title_full_unstemmed |
Ice Stream C slowdown is not stabilizing West Antarctic Ice Sheet |
title_sort |
ice stream c slowdown is not stabilizing west antarctic ice sheet |
publishDate |
1999 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.9711 http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) ENVELOPE(-155.000,-155.000,-82.000,-82.000) |
geographic |
Antarctic Ross Sea West Antarctica West Antarctic Ice Sheet Siple Siple Dome Siple Coast |
geographic_facet |
Antarctic Ross Sea West Antarctica West Antarctic Ice Sheet Siple Siple Dome Siple Coast |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Stream B Ice Stream C Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Stream B Ice Stream C Ross Sea West Antarctica |
op_source |
http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.9711 http://www.stolaf.edu/other/cegsic/publications/Anandakrishnan et al.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766263568281370624 |