GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica
In the last 2 decades, Pine Island Glacier (PIG) experienced marked speedup, thinning, and grounding-line retreat, likely due to marine ice-sheet instability and ice-shelf basal melt. To better understand these processes, we combined 2008–2010 and 2012–2014 GPS records with dynamic firn model output...
Published in: | The Cryosphere |
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Copernicus Publications
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007952 2023-05-15T13:34:49+02:00 GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica Shean, David E. Christianson, Knut Larson, Kristine M. Ligtenberg, Stefan R. M. Joughin, Ian R. Smith, Ben E. Stevens, C. Max Bushuk, Mitchell Holland, David M. 2017-11 electronic https://doi.org/10.5194/tc-11-2655-2017 https://noa.gwlb.de/receive/cop_mods_00007952 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007909/tc-11-2655-2017.pdf https://tc.copernicus.org/articles/11/2655/2017/tc-11-2655-2017.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-11-2655-2017 https://noa.gwlb.de/receive/cop_mods_00007952 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007909/tc-11-2655-2017.pdf https://tc.copernicus.org/articles/11/2655/2017/tc-11-2655-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/tc-11-2655-2017 2022-02-08T22:58:16Z In the last 2 decades, Pine Island Glacier (PIG) experienced marked speedup, thinning, and grounding-line retreat, likely due to marine ice-sheet instability and ice-shelf basal melt. To better understand these processes, we combined 2008–2010 and 2012–2014 GPS records with dynamic firn model output to constrain local surface and basal mass balance for PIG. We used GPS interferometric reflectometry to precisely measure absolute surface elevation (zsurf) and Lagrangian surface elevation change (Dzsurf∕ Dt). Observed surface elevation relative to a firn layer tracer for the initial surface (zsurf − zsurf0′) is consistent with model estimates of surface mass balance (SMB, primarily snow accumulation). A relatively abrupt ∼ 0.2–0.3 m surface elevation decrease, likely due to surface melt and increased compaction rates, is observed during a period of warm atmospheric temperatures from December 2012 to January 2013. Observed Dzsurf∕ Dt trends (−1 to −4 m yr−1) for the PIG shelf sites are all highly linear. Corresponding basal melt rate estimates range from ∼ 10 to 40 m yr−1, in good agreement with those derived from ice-bottom acoustic ranging, phase-sensitive ice-penetrating radar, and high-resolution stereo digital elevation model (DEM) records. The GPS and DEM records document higher melt rates within and near features associated with longitudinal extension (i.e., transverse surface depressions, rifts). Basal melt rates for the 2012–2014 period show limited temporal variability despite large changes in ocean temperature recorded by moorings in Pine Island Bay. Our results demonstrate the value of long-term GPS records for ice-shelf mass balance studies, with implications for the sensitivity of ice–ocean interaction at PIG. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Pine Island Glacier The Cryosphere Niedersächsisches Online-Archiv NOA Island Bay ENVELOPE(-109.085,-109.085,59.534,59.534) Pine Island Bay ENVELOPE(-102.000,-102.000,-74.750,-74.750) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) The Cryosphere 11 6 2655 2674 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Shean, David E. Christianson, Knut Larson, Kristine M. Ligtenberg, Stefan R. M. Joughin, Ian R. Smith, Ben E. Stevens, C. Max Bushuk, Mitchell Holland, David M. GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
In the last 2 decades, Pine Island Glacier (PIG) experienced marked speedup, thinning, and grounding-line retreat, likely due to marine ice-sheet instability and ice-shelf basal melt. To better understand these processes, we combined 2008–2010 and 2012–2014 GPS records with dynamic firn model output to constrain local surface and basal mass balance for PIG. We used GPS interferometric reflectometry to precisely measure absolute surface elevation (zsurf) and Lagrangian surface elevation change (Dzsurf∕ Dt). Observed surface elevation relative to a firn layer tracer for the initial surface (zsurf − zsurf0′) is consistent with model estimates of surface mass balance (SMB, primarily snow accumulation). A relatively abrupt ∼ 0.2–0.3 m surface elevation decrease, likely due to surface melt and increased compaction rates, is observed during a period of warm atmospheric temperatures from December 2012 to January 2013. Observed Dzsurf∕ Dt trends (−1 to −4 m yr−1) for the PIG shelf sites are all highly linear. Corresponding basal melt rate estimates range from ∼ 10 to 40 m yr−1, in good agreement with those derived from ice-bottom acoustic ranging, phase-sensitive ice-penetrating radar, and high-resolution stereo digital elevation model (DEM) records. The GPS and DEM records document higher melt rates within and near features associated with longitudinal extension (i.e., transverse surface depressions, rifts). Basal melt rates for the 2012–2014 period show limited temporal variability despite large changes in ocean temperature recorded by moorings in Pine Island Bay. Our results demonstrate the value of long-term GPS records for ice-shelf mass balance studies, with implications for the sensitivity of ice–ocean interaction at PIG. |
format |
Article in Journal/Newspaper |
author |
Shean, David E. Christianson, Knut Larson, Kristine M. Ligtenberg, Stefan R. M. Joughin, Ian R. Smith, Ben E. Stevens, C. Max Bushuk, Mitchell Holland, David M. |
author_facet |
Shean, David E. Christianson, Knut Larson, Kristine M. Ligtenberg, Stefan R. M. Joughin, Ian R. Smith, Ben E. Stevens, C. Max Bushuk, Mitchell Holland, David M. |
author_sort |
Shean, David E. |
title |
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
title_short |
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
title_full |
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
title_fullStr |
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
title_full_unstemmed |
GPS-derived estimates of surface mass balance and ocean-induced basal melt for Pine Island Glacier ice shelf, Antarctica |
title_sort |
gps-derived estimates of surface mass balance and ocean-induced basal melt for pine island glacier ice shelf, antarctica |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/tc-11-2655-2017 https://noa.gwlb.de/receive/cop_mods_00007952 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007909/tc-11-2655-2017.pdf https://tc.copernicus.org/articles/11/2655/2017/tc-11-2655-2017.pdf |
long_lat |
ENVELOPE(-109.085,-109.085,59.534,59.534) ENVELOPE(-102.000,-102.000,-74.750,-74.750) ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Island Bay Pine Island Bay Pine Island Glacier |
geographic_facet |
Island Bay Pine Island Bay Pine Island Glacier |
genre |
Antarc* Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Pine Island Glacier The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Sheet Ice Shelf Pine Island Pine Island Bay Pine Island Glacier The Cryosphere |
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-11-2655-2017 https://noa.gwlb.de/receive/cop_mods_00007952 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007909/tc-11-2655-2017.pdf https://tc.copernicus.org/articles/11/2655/2017/tc-11-2655-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-11-2655-2017 |
container_title |
The Cryosphere |
container_volume |
11 |
container_issue |
6 |
container_start_page |
2655 |
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2674 |
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1766058051282927616 |