Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica
Lake CookE2, upstream of Cook Glacier in East Antarctica, is an “active” subglacial lake that experiences episodic discharge and recharge of basal water. Although around 130 active lakes are known to exist, the majority are not able to be identified by ice-sounding radar techniques, suggesting they...
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ftdoajarticles:oai:doaj.org/article:45c9ff20b9824eaeb40e59edef355ba8 2023-05-15T13:53:51+02:00 Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica Yan Li Yang Lu Martin J. Siegert 2020-07-01T00:00:00Z https://doi.org/10.3389/feart.2020.00294 https://doaj.org/article/45c9ff20b9824eaeb40e59edef355ba8 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/feart.2020.00294/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00294 https://doaj.org/article/45c9ff20b9824eaeb40e59edef355ba8 Frontiers in Earth Science, Vol 8 (2020) airborne ice penetrating radar satellite altimetry Lake CookE2 active lake deep-water drainage and refill Science Q article 2020 ftdoajarticles https://doi.org/10.3389/feart.2020.00294 2022-12-31T01:25:08Z Lake CookE2, upstream of Cook Glacier in East Antarctica, is an “active” subglacial lake that experiences episodic discharge and recharge of basal water. Although around 130 active lakes are known to exist, the majority are not able to be identified by ice-sounding radar techniques, suggesting they are ephemeral and/or distributed stores of small amounts of water rather than permanent significant singular features. However, airborne radar data from Lake CookE2 reveal a bright and flat ice-bed interface, providing clear evidence of deep (>10 m) water surrounded by elevated topography. The data show the lake area is ∼46 km2; three times less than a previous estimate (145 km2) from Ice, Cloud and land Elevation Satellite (ICESat) satellite altimetry, suggesting a bias in identifying subglacial lake area from surface depressions. Using time-series altimetry from ICESat, Cryosat-2, and the Reference Elevation Model of Antarctica, we re-estimate the lake discharged ∼2.73 km3 of water (or ∼59.6 m in lake level) between February 2006 and October 2008. Subsequently, the ice surface over the lake rose steadily and experienced a mean uplift of ∼9 m between January 2011 and November 2016, indicating continuous recharge with total volume increase of ∼0.42 km3. The lake is recharging at a rate of ∼1.1 m/year, which means it could take another ∼39 years to reach the lake level that triggered the previous discharge. Article in Journal/Newspaper Antarc* Antarctica Cook Glacier East Antarctica Directory of Open Access Journals: DOAJ Articles East Antarctica Cook Glacier ENVELOPE(-36.191,-36.191,-54.446,-54.446) Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
airborne ice penetrating radar satellite altimetry Lake CookE2 active lake deep-water drainage and refill Science Q |
spellingShingle |
airborne ice penetrating radar satellite altimetry Lake CookE2 active lake deep-water drainage and refill Science Q Yan Li Yang Lu Martin J. Siegert Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
topic_facet |
airborne ice penetrating radar satellite altimetry Lake CookE2 active lake deep-water drainage and refill Science Q |
description |
Lake CookE2, upstream of Cook Glacier in East Antarctica, is an “active” subglacial lake that experiences episodic discharge and recharge of basal water. Although around 130 active lakes are known to exist, the majority are not able to be identified by ice-sounding radar techniques, suggesting they are ephemeral and/or distributed stores of small amounts of water rather than permanent significant singular features. However, airborne radar data from Lake CookE2 reveal a bright and flat ice-bed interface, providing clear evidence of deep (>10 m) water surrounded by elevated topography. The data show the lake area is ∼46 km2; three times less than a previous estimate (145 km2) from Ice, Cloud and land Elevation Satellite (ICESat) satellite altimetry, suggesting a bias in identifying subglacial lake area from surface depressions. Using time-series altimetry from ICESat, Cryosat-2, and the Reference Elevation Model of Antarctica, we re-estimate the lake discharged ∼2.73 km3 of water (or ∼59.6 m in lake level) between February 2006 and October 2008. Subsequently, the ice surface over the lake rose steadily and experienced a mean uplift of ∼9 m between January 2011 and November 2016, indicating continuous recharge with total volume increase of ∼0.42 km3. The lake is recharging at a rate of ∼1.1 m/year, which means it could take another ∼39 years to reach the lake level that triggered the previous discharge. |
format |
Article in Journal/Newspaper |
author |
Yan Li Yang Lu Martin J. Siegert |
author_facet |
Yan Li Yang Lu Martin J. Siegert |
author_sort |
Yan Li |
title |
Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
title_short |
Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
title_full |
Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
title_fullStr |
Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
title_full_unstemmed |
Radar Sounding Confirms a Hydrologically Active Deep-Water Subglacial Lake in East Antarctica |
title_sort |
radar sounding confirms a hydrologically active deep-water subglacial lake in east antarctica |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/feart.2020.00294 https://doaj.org/article/45c9ff20b9824eaeb40e59edef355ba8 |
long_lat |
ENVELOPE(-36.191,-36.191,-54.446,-54.446) |
geographic |
East Antarctica Cook Glacier |
geographic_facet |
East Antarctica Cook Glacier |
genre |
Antarc* Antarctica Cook Glacier East Antarctica |
genre_facet |
Antarc* Antarctica Cook Glacier East Antarctica |
op_source |
Frontiers in Earth Science, Vol 8 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/feart.2020.00294/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2020.00294 https://doaj.org/article/45c9ff20b9824eaeb40e59edef355ba8 |
op_doi |
https://doi.org/10.3389/feart.2020.00294 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
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1766259305672081408 |