Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Cryosphere 8 (2014): 1375-1392, doi:10.5194/tc-8-1375-2014. In Antarctica, uncertainties in mass input and output translate directly into uncertaint...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications on behalf of the European Geosciences Union
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Online Access: | https://hdl.handle.net/1912/6904 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6904 2023-05-15T13:24:16+02:00 Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation Medley, Brooke Joughin, Ian Smith, B. E. Das, Sarah B. Steig, Eric J. Conway, Howard Gogineni, S. Lewis, Cameron Criscitiello, Alison S. McConnell, Joseph R. van den Broeke, Michiel R. Lenaerts, Jan T. M. Bromwich, D. H. Nicolas, J. P. Leuschen, C. 2014-07-31 application/pdf https://hdl.handle.net/1912/6904 en eng Copernicus Publications on behalf of the European Geosciences Union https://doi.org/10.5194/tc-8-1375-2014 Cryosphere 8 (2014): 1375-1392 https://hdl.handle.net/1912/6904 doi:10.5194/tc-8-1375-2014 Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ CC-BY Cryosphere 8 (2014): 1375-1392 doi:10.5194/tc-8-1375-2014 Article 2014 ftwhoas https://doi.org/10.5194/tc-8-1375-2014 2022-05-28T22:59:12Z © The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Cryosphere 8 (2014): 1375-1392, doi:10.5194/tc-8-1375-2014. In Antarctica, uncertainties in mass input and output translate directly into uncertainty in glacier mass balance and thus in sea level impact. While remotely sensed observations of ice velocity and thickness over the major outlet glaciers have improved our understanding of ice loss to the ocean, snow accumulation over the vast Antarctic interior remains largely unmeasured. Here, we show that an airborne radar system, combined with ice-core glaciochemical analysis, provide the means necessary to measure the accumulation rate at the catchment-scale along the Amundsen Sea coast of West Antarctica. We used along-track radar-derived accumulation to generate a 1985–2009 average accumulation grid that resolves moderate- to large-scale features (>25 km) over the Pine Island–Thwaites glacier drainage system. Comparisons with estimates from atmospheric models and gridded climatologies generally show our results as having less accumulation in the lower-elevation coastal zone but greater accumulation in the interior. Ice discharge, measured over discrete time intervals between 1994 and 2012, combined with our catchment-wide accumulation rates provide an 18-year mass balance history for the sector. While Thwaites Glacier lost the most ice in the mid-1990s, Pine Island Glacier's losses increased substantially by 2006, overtaking Thwaites as the largest regional contributor to sea-level rise. The trend of increasing discharge for both glaciers, however, appears to have leveled off since 2008. This research was supported at UW by NSF OPP grants ANT-0631973 (B Medley, I. Joughin, E. J. Steig, and H. Conway) and ANT-0424589 (B. Medley and I. Joughin). Work at WHOI was supported by NSF OPP grant ANT-0632031 and NASA grant NNX10AP09G (S. B. Das and A. S. Criscitiello). D. H. Bromwich and J. P. Nicolas were supported ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica ice core Pine Island Thwaites Glacier West Antarctica Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic West Antarctica Amundsen Sea Conway ENVELOPE(-61.422,-61.422,-62.841,-62.841) Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) Medley ENVELOPE(-56.036,-56.036,-62.996,-62.996) The Cryosphere 8 4 1375 1392 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
description |
© The Author(s), 2014. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Cryosphere 8 (2014): 1375-1392, doi:10.5194/tc-8-1375-2014. In Antarctica, uncertainties in mass input and output translate directly into uncertainty in glacier mass balance and thus in sea level impact. While remotely sensed observations of ice velocity and thickness over the major outlet glaciers have improved our understanding of ice loss to the ocean, snow accumulation over the vast Antarctic interior remains largely unmeasured. Here, we show that an airborne radar system, combined with ice-core glaciochemical analysis, provide the means necessary to measure the accumulation rate at the catchment-scale along the Amundsen Sea coast of West Antarctica. We used along-track radar-derived accumulation to generate a 1985–2009 average accumulation grid that resolves moderate- to large-scale features (>25 km) over the Pine Island–Thwaites glacier drainage system. Comparisons with estimates from atmospheric models and gridded climatologies generally show our results as having less accumulation in the lower-elevation coastal zone but greater accumulation in the interior. Ice discharge, measured over discrete time intervals between 1994 and 2012, combined with our catchment-wide accumulation rates provide an 18-year mass balance history for the sector. While Thwaites Glacier lost the most ice in the mid-1990s, Pine Island Glacier's losses increased substantially by 2006, overtaking Thwaites as the largest regional contributor to sea-level rise. The trend of increasing discharge for both glaciers, however, appears to have leveled off since 2008. This research was supported at UW by NSF OPP grants ANT-0631973 (B Medley, I. Joughin, E. J. Steig, and H. Conway) and ANT-0424589 (B. Medley and I. Joughin). Work at WHOI was supported by NSF OPP grant ANT-0632031 and NASA grant NNX10AP09G (S. B. Das and A. S. Criscitiello). D. H. Bromwich and J. P. Nicolas were supported ... |
format |
Article in Journal/Newspaper |
author |
Medley, Brooke Joughin, Ian Smith, B. E. Das, Sarah B. Steig, Eric J. Conway, Howard Gogineni, S. Lewis, Cameron Criscitiello, Alison S. McConnell, Joseph R. van den Broeke, Michiel R. Lenaerts, Jan T. M. Bromwich, D. H. Nicolas, J. P. Leuschen, C. |
spellingShingle |
Medley, Brooke Joughin, Ian Smith, B. E. Das, Sarah B. Steig, Eric J. Conway, Howard Gogineni, S. Lewis, Cameron Criscitiello, Alison S. McConnell, Joseph R. van den Broeke, Michiel R. Lenaerts, Jan T. M. Bromwich, D. H. Nicolas, J. P. Leuschen, C. Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
author_facet |
Medley, Brooke Joughin, Ian Smith, B. E. Das, Sarah B. Steig, Eric J. Conway, Howard Gogineni, S. Lewis, Cameron Criscitiello, Alison S. McConnell, Joseph R. van den Broeke, Michiel R. Lenaerts, Jan T. M. Bromwich, D. H. Nicolas, J. P. Leuschen, C. |
author_sort |
Medley, Brooke |
title |
Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
title_short |
Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
title_full |
Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
title_fullStr |
Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
title_full_unstemmed |
Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation |
title_sort |
constraining the recent mass balance of pine island and thwaites glaciers, west antarctica, with airborne observations of snow accumulation |
publisher |
Copernicus Publications on behalf of the European Geosciences Union |
publishDate |
2014 |
url |
https://hdl.handle.net/1912/6904 |
long_lat |
ENVELOPE(-61.422,-61.422,-62.841,-62.841) ENVELOPE(-106.750,-106.750,-75.500,-75.500) ENVELOPE(-56.036,-56.036,-62.996,-62.996) |
geographic |
Antarctic West Antarctica Amundsen Sea Conway Thwaites Glacier Medley |
geographic_facet |
Antarctic West Antarctica Amundsen Sea Conway Thwaites Glacier Medley |
genre |
Amundsen Sea Antarc* Antarctic Antarctica ice core Pine Island Thwaites Glacier West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica ice core Pine Island Thwaites Glacier West Antarctica |
op_source |
Cryosphere 8 (2014): 1375-1392 doi:10.5194/tc-8-1375-2014 |
op_relation |
https://doi.org/10.5194/tc-8-1375-2014 Cryosphere 8 (2014): 1375-1392 https://hdl.handle.net/1912/6904 doi:10.5194/tc-8-1375-2014 |
op_rights |
Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-8-1375-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1375 |
op_container_end_page |
1392 |
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1766378397698621440 |