Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream
We identify two previously unknown subglacial lakes beneath the stagnated trunk of the Kamb Ice Stream (KIS). Rapid fill-drain hydrologic events over several months are inferred from surface height changes measured by CryoSat-2 altimetry and indicate that the lakes are probably connected by a subgla...
Published in: | The Cryosphere |
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Language: | English |
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Copernicus Publications
2016
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Online Access: | https://doi.org/10.5194/tc-10-2971-2016 http://www.the-cryosphere.net/10/2971/2016/tc-10-2971-2016.pdf https://doaj.org/article/aaa6126616fd4d34a50044270ef54722 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:aaa6126616fd4d34a50044270ef54722 2023-05-15T16:41:53+02:00 Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream B.-H. Kim C.-K. Lee K.-W. Seo W. S. Lee T. Scambos 2016-12-01 https://doi.org/10.5194/tc-10-2971-2016 http://www.the-cryosphere.net/10/2971/2016/tc-10-2971-2016.pdf https://doaj.org/article/aaa6126616fd4d34a50044270ef54722 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-10-2971-2016 http://www.the-cryosphere.net/10/2971/2016/tc-10-2971-2016.pdf https://doaj.org/article/aaa6126616fd4d34a50044270ef54722 undefined The Cryosphere, Vol 10, Iss 6, Pp 2971-2980 (2016) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/tc-10-2971-2016 2023-01-22T17:51:12Z We identify two previously unknown subglacial lakes beneath the stagnated trunk of the Kamb Ice Stream (KIS). Rapid fill-drain hydrologic events over several months are inferred from surface height changes measured by CryoSat-2 altimetry and indicate that the lakes are probably connected by a subglacial drainage network, whose structure is inferred from the regional hydraulic potential and probably links the lakes. The sequential fill-drain behavior of the subglacial lakes and concurrent rapid thinning in a channel-like topographic feature near the grounding line implies that the subglacial water repeatedly flows from the region above the trunk to the KIS grounding line and out beneath the Ross Ice Shelf. Ice shelf elevation near the hypothesized outlet is observed to decrease slowly during the study period. Our finding supports a previously published conceptual model of the KIS shutdown stemming from a transition from distributed flow to well-drained channelized flow of subglacial water. However, a water-piracy hypothesis in which the KIS subglacial water system is being starved by drainage in adjacent ice streams is also supported by the fact that the degree of KIS trunk subglacial lake activity is relatively weaker than those of the upstream lakes. Article in Journal/Newspaper Ice Shelf Kamb Ice Stream Ross Ice Shelf The Cryosphere Unknown Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) Ross Ice Shelf The Cryosphere 10 6 2971 2980 |
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English |
topic |
geo envir |
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geo envir B.-H. Kim C.-K. Lee K.-W. Seo W. S. Lee T. Scambos Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
topic_facet |
geo envir |
description |
We identify two previously unknown subglacial lakes beneath the stagnated trunk of the Kamb Ice Stream (KIS). Rapid fill-drain hydrologic events over several months are inferred from surface height changes measured by CryoSat-2 altimetry and indicate that the lakes are probably connected by a subglacial drainage network, whose structure is inferred from the regional hydraulic potential and probably links the lakes. The sequential fill-drain behavior of the subglacial lakes and concurrent rapid thinning in a channel-like topographic feature near the grounding line implies that the subglacial water repeatedly flows from the region above the trunk to the KIS grounding line and out beneath the Ross Ice Shelf. Ice shelf elevation near the hypothesized outlet is observed to decrease slowly during the study period. Our finding supports a previously published conceptual model of the KIS shutdown stemming from a transition from distributed flow to well-drained channelized flow of subglacial water. However, a water-piracy hypothesis in which the KIS subglacial water system is being starved by drainage in adjacent ice streams is also supported by the fact that the degree of KIS trunk subglacial lake activity is relatively weaker than those of the upstream lakes. |
format |
Article in Journal/Newspaper |
author |
B.-H. Kim C.-K. Lee K.-W. Seo W. S. Lee T. Scambos |
author_facet |
B.-H. Kim C.-K. Lee K.-W. Seo W. S. Lee T. Scambos |
author_sort |
B.-H. Kim |
title |
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
title_short |
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
title_full |
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
title_fullStr |
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
title_full_unstemmed |
Active subglacial lakes and channelized water flow beneath the Kamb Ice Stream |
title_sort |
active subglacial lakes and channelized water flow beneath the kamb ice stream |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-2971-2016 http://www.the-cryosphere.net/10/2971/2016/tc-10-2971-2016.pdf https://doaj.org/article/aaa6126616fd4d34a50044270ef54722 |
long_lat |
ENVELOPE(-145.000,-145.000,-82.250,-82.250) |
geographic |
Kamb Ice Stream Ross Ice Shelf |
geographic_facet |
Kamb Ice Stream Ross Ice Shelf |
genre |
Ice Shelf Kamb Ice Stream Ross Ice Shelf The Cryosphere |
genre_facet |
Ice Shelf Kamb Ice Stream Ross Ice Shelf The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 6, Pp 2971-2980 (2016) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-10-2971-2016 http://www.the-cryosphere.net/10/2971/2016/tc-10-2971-2016.pdf https://doaj.org/article/aaa6126616fd4d34a50044270ef54722 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-10-2971-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
6 |
container_start_page |
2971 |
op_container_end_page |
2980 |
_version_ |
1766032345262981120 |