Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season
The Amundsen Sea Embayment of the West Antarctic Ice Sheet contains Thwaites and Pine Island Glaciers, two of the most rapidly changing glaciers in Antarctica. To date, Pine Island and Thwaites Glaciers have only been observed by independent airborne radar sounding surveys, but a combined cross-basi...
Published in: | Journal of Geophysical Research: Earth Surface |
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American Geophysical Union
2021
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Online Access: | http://nora.nerc.ac.uk/id/eprint/531243/ https://nora.nerc.ac.uk/id/eprint/531243/1/2021JF006296.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JF006296 |
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ftnerc:oai:nora.nerc.ac.uk:531243 2023-05-15T13:23:47+02:00 Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season Chu, Winnie Hilger, Andrew M. Culberg, Riley Schroeder, Dustin M. Jordan, Thomas M. Seroussi, Helene Young, Duncan A. Blankenship, Donald D. Vaughan, David G. 2021-10-22 text http://nora.nerc.ac.uk/id/eprint/531243/ https://nora.nerc.ac.uk/id/eprint/531243/1/2021JF006296.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JF006296 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/531243/1/2021JF006296.pdf Chu, Winnie; Hilger, Andrew M.; Culberg, Riley; Schroeder, Dustin M.; Jordan, Thomas M.; Seroussi, Helene; Young, Duncan A.; Blankenship, Donald D.; Vaughan, David G. orcid:0000-0002-9065-0570 . 2021 Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season. Journal of Geophysical Research: Earth Surface, 126 (10), e2021JF006296. 17, pp. https://doi.org/10.1029/2021JF006296 <https://doi.org/10.1029/2021JF006296> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1029/2021JF006296 2023-02-04T19:52:39Z The Amundsen Sea Embayment of the West Antarctic Ice Sheet contains Thwaites and Pine Island Glaciers, two of the most rapidly changing glaciers in Antarctica. To date, Pine Island and Thwaites Glaciers have only been observed by independent airborne radar sounding surveys, but a combined cross-basin analysis that investigates the basal conditions across the Pine Island-Thwaites Glaciers boundary has not been performed. Here, we combine two radar surveys and correct for their differences in system parameters to produce unified englacial attenuation and basal relative reflectivity maps spanning both Pine Island and Thwaites Glaciers. Relative reflectivities range from -24.8 to +37.4 dB with the highest values beneath fast-flowing ice at the ice sheet margin. By comparing our reflectivity results with previously derived radar specularity and trailing bed echoes at Thwaites Glacier, we find a highly diverse subglacial landscape and hydrologic condition that evolve along flow. Together, these findings highlight the potential for joint airborne radar analysis with ground-based seismic and geomorphological observations to understand variations in the bed properties and cross-catchment interactions of ice streams and outlet glaciers. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Thwaites Glacier Natural Environment Research Council: NERC Open Research Archive Antarctic Amundsen Sea West Antarctic Ice Sheet Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Journal of Geophysical Research: Earth Surface 126 10 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The Amundsen Sea Embayment of the West Antarctic Ice Sheet contains Thwaites and Pine Island Glaciers, two of the most rapidly changing glaciers in Antarctica. To date, Pine Island and Thwaites Glaciers have only been observed by independent airborne radar sounding surveys, but a combined cross-basin analysis that investigates the basal conditions across the Pine Island-Thwaites Glaciers boundary has not been performed. Here, we combine two radar surveys and correct for their differences in system parameters to produce unified englacial attenuation and basal relative reflectivity maps spanning both Pine Island and Thwaites Glaciers. Relative reflectivities range from -24.8 to +37.4 dB with the highest values beneath fast-flowing ice at the ice sheet margin. By comparing our reflectivity results with previously derived radar specularity and trailing bed echoes at Thwaites Glacier, we find a highly diverse subglacial landscape and hydrologic condition that evolve along flow. Together, these findings highlight the potential for joint airborne radar analysis with ground-based seismic and geomorphological observations to understand variations in the bed properties and cross-catchment interactions of ice streams and outlet glaciers. |
format |
Article in Journal/Newspaper |
author |
Chu, Winnie Hilger, Andrew M. Culberg, Riley Schroeder, Dustin M. Jordan, Thomas M. Seroussi, Helene Young, Duncan A. Blankenship, Donald D. Vaughan, David G. |
spellingShingle |
Chu, Winnie Hilger, Andrew M. Culberg, Riley Schroeder, Dustin M. Jordan, Thomas M. Seroussi, Helene Young, Duncan A. Blankenship, Donald D. Vaughan, David G. Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
author_facet |
Chu, Winnie Hilger, Andrew M. Culberg, Riley Schroeder, Dustin M. Jordan, Thomas M. Seroussi, Helene Young, Duncan A. Blankenship, Donald D. Vaughan, David G. |
author_sort |
Chu, Winnie |
title |
Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
title_short |
Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
title_full |
Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
title_fullStr |
Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
title_full_unstemmed |
Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season |
title_sort |
multisystem synthesis of radar sounding observations of the amundsen sea sector from the 2004‐2005 field season |
publisher |
American Geophysical Union |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/531243/ https://nora.nerc.ac.uk/id/eprint/531243/1/2021JF006296.pdf https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2021JF006296 |
long_lat |
ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Antarctic Amundsen Sea West Antarctic Ice Sheet Thwaites Glacier |
geographic_facet |
Antarctic Amundsen Sea West Antarctic Ice Sheet Thwaites Glacier |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Thwaites Glacier |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet Pine Island Thwaites Glacier |
op_relation |
https://nora.nerc.ac.uk/id/eprint/531243/1/2021JF006296.pdf Chu, Winnie; Hilger, Andrew M.; Culberg, Riley; Schroeder, Dustin M.; Jordan, Thomas M.; Seroussi, Helene; Young, Duncan A.; Blankenship, Donald D.; Vaughan, David G. orcid:0000-0002-9065-0570 . 2021 Multisystem synthesis of radar sounding observations of the Amundsen Sea sector from the 2004‐2005 field season. Journal of Geophysical Research: Earth Surface, 126 (10), e2021JF006296. 17, pp. https://doi.org/10.1029/2021JF006296 <https://doi.org/10.1029/2021JF006296> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021JF006296 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
10 |
_version_ |
1766375406166867968 |