Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica
Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice-flow velocities over periods of months to years. Although subglacial lake drainage events have been observed from satellite-altimetric data, little is known about their role in the long-term evolution of ice-sheet bas...
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00000850 2023-05-15T13:49:21+02:00 Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica Kirkham, James D. Hogan, Kelly A. Larter, Robert D. Arnold, Neil S. Nitsche, Frank O. Golledge, Nicholas R. Dowdeswell, Julian A. 2019-07 electronic https://doi.org/10.5194/tc-13-1959-2019 https://noa.gwlb.de/receive/cop_mods_00000850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000812/tc-13-1959-2019.pdf https://tc.copernicus.org/articles/13/1959/2019/tc-13-1959-2019.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-13-1959-2019 https://noa.gwlb.de/receive/cop_mods_00000850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000812/tc-13-1959-2019.pdf https://tc.copernicus.org/articles/13/1959/2019/tc-13-1959-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-1959-2019 2022-02-08T23:02:07Z Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice-flow velocities over periods of months to years. Although subglacial lake drainage events have been observed from satellite-altimetric data, little is known about their role in the long-term evolution of ice-sheet basal hydrology. Here, we systematically map and model past water flow through an extensive area containing over 1000 subglacial channels and 19 former lake basins exposed on over 19 000 km2 of seafloor by the retreat of Pine Island and Thwaites glaciers, West Antarctica. At 507 m wide and 43 m deep on average, the channels offshore of present-day Pine Island and Thwaites glaciers are approximately twice as deep, 3 times as wide, and cover an area over 400 times larger than the terrestrial meltwater channels comprising the Labyrinth in the Antarctic Dry Valleys. The channels incised into bedrock offshore of contemporary Pine Island and Thwaites glaciers would have been capable of accommodating discharges of up to 8.8×106 m3 s−1. We suggest that the channels were formed by episodic discharges from subglacial lakes trapped during ice-sheet advance and retreat over multiple glacial periods. Our results document the widespread influence of episodic subglacial drainage events during past glacial periods, in particular beneath large ice streams similar to those that continue to dominate contemporary ice-sheet discharge. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Pine Island The Cryosphere West Antarctica Niedersächsisches Online-Archiv NOA Antarctic Labyrinth ENVELOPE(160.833,160.833,-77.550,-77.550) The Antarctic West Antarctica The Cryosphere 13 7 1959 1981 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Kirkham, James D. Hogan, Kelly A. Larter, Robert D. Arnold, Neil S. Nitsche, Frank O. Golledge, Nicholas R. Dowdeswell, Julian A. Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Outburst floods from subglacial lakes beneath the Antarctic Ice Sheet modulate ice-flow velocities over periods of months to years. Although subglacial lake drainage events have been observed from satellite-altimetric data, little is known about their role in the long-term evolution of ice-sheet basal hydrology. Here, we systematically map and model past water flow through an extensive area containing over 1000 subglacial channels and 19 former lake basins exposed on over 19 000 km2 of seafloor by the retreat of Pine Island and Thwaites glaciers, West Antarctica. At 507 m wide and 43 m deep on average, the channels offshore of present-day Pine Island and Thwaites glaciers are approximately twice as deep, 3 times as wide, and cover an area over 400 times larger than the terrestrial meltwater channels comprising the Labyrinth in the Antarctic Dry Valleys. The channels incised into bedrock offshore of contemporary Pine Island and Thwaites glaciers would have been capable of accommodating discharges of up to 8.8×106 m3 s−1. We suggest that the channels were formed by episodic discharges from subglacial lakes trapped during ice-sheet advance and retreat over multiple glacial periods. Our results document the widespread influence of episodic subglacial drainage events during past glacial periods, in particular beneath large ice streams similar to those that continue to dominate contemporary ice-sheet discharge. |
format |
Article in Journal/Newspaper |
author |
Kirkham, James D. Hogan, Kelly A. Larter, Robert D. Arnold, Neil S. Nitsche, Frank O. Golledge, Nicholas R. Dowdeswell, Julian A. |
author_facet |
Kirkham, James D. Hogan, Kelly A. Larter, Robert D. Arnold, Neil S. Nitsche, Frank O. Golledge, Nicholas R. Dowdeswell, Julian A. |
author_sort |
Kirkham, James D. |
title |
Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
title_short |
Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
title_full |
Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
title_fullStr |
Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
title_full_unstemmed |
Past water flow beneath Pine Island and Thwaites glaciers, West Antarctica |
title_sort |
past water flow beneath pine island and thwaites glaciers, west antarctica |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-1959-2019 https://noa.gwlb.de/receive/cop_mods_00000850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000812/tc-13-1959-2019.pdf https://tc.copernicus.org/articles/13/1959/2019/tc-13-1959-2019.pdf |
long_lat |
ENVELOPE(160.833,160.833,-77.550,-77.550) |
geographic |
Antarctic Labyrinth The Antarctic West Antarctica |
geographic_facet |
Antarctic Labyrinth The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Sheet Pine Island The Cryosphere West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Pine Island 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-13-1959-2019 https://noa.gwlb.de/receive/cop_mods_00000850 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00000812/tc-13-1959-2019.pdf https://tc.copernicus.org/articles/13/1959/2019/tc-13-1959-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-1959-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
7 |
container_start_page |
1959 |
op_container_end_page |
1981 |
_version_ |
1766251214281900032 |