Antarctic bedrock topography uncertainty and ice sheet stability
All Rights Reserved. Antarctic bedrock elevation estimates have uncertainties exceeding 1km in certain regions. Bedrock elevation, particularly where the bedrock is below sea level and bordering the ocean, can have a large impact on ice sheet stability. We investigate how present-day bedrock elevati...
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Online Access: | https://eprints.whiterose.ac.uk/98022/ https://eprints.whiterose.ac.uk/98022/1/Gasson2015.pdf https://doi.org/10.1002/2015GL064322 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:98022 2023-05-15T13:55:00+02:00 Antarctic bedrock topography uncertainty and ice sheet stability Gasson, E. DeConto, R. Pollard, D. 2015-07-14 text https://eprints.whiterose.ac.uk/98022/ https://eprints.whiterose.ac.uk/98022/1/Gasson2015.pdf https://doi.org/10.1002/2015GL064322 en eng American Geophysical Union https://eprints.whiterose.ac.uk/98022/1/Gasson2015.pdf Gasson, E., DeConto, R. and Pollard, D. (2015) Antarctic bedrock topography uncertainty and ice sheet stability. Geophysical Research Letters, 42 (13). pp. 5372-5377. ISSN 0094-8276 Article PeerReviewed 2015 ftleedsuniv https://doi.org/10.1002/2015GL064322 2023-01-30T21:41:14Z All Rights Reserved. Antarctic bedrock elevation estimates have uncertainties exceeding 1km in certain regions. Bedrock elevation, particularly where the bedrock is below sea level and bordering the ocean, can have a large impact on ice sheet stability. We investigate how present-day bedrock elevation uncertainty affects ice sheet model simulations for a generic past warm period based on the mid-Pliocene, although these uncertainties are also relevant to present-day and future ice sheet stability. We perform an ensemble of simulations with random topographic noise added with various length scales and with amplitudes tuned to the uncertainty of the Bedmap2 data set. Total Antarctic ice sheet retreat in these simulations varies between 12.6 and 17.9m equivalent sea level rise after 3kyrs of warm climate forcing. This study highlights the sensitivity of ice sheet models to existing uncertainties in bedrock elevation and the ongoing need for new data acquisition. Key Points Quantify how Antarctic bed elevation uncertainty affects ice sheet simulations Simulate retreat of the Antarctic ice sheet for a warm Pliocene climate Identify key areas for future improvements to bed elevation data. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet White Rose Research Online (Universities of Leeds, Sheffield & York) Antarctic The Antarctic Geophysical Research Letters 42 13 5372 5377 |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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English |
description |
All Rights Reserved. Antarctic bedrock elevation estimates have uncertainties exceeding 1km in certain regions. Bedrock elevation, particularly where the bedrock is below sea level and bordering the ocean, can have a large impact on ice sheet stability. We investigate how present-day bedrock elevation uncertainty affects ice sheet model simulations for a generic past warm period based on the mid-Pliocene, although these uncertainties are also relevant to present-day and future ice sheet stability. We perform an ensemble of simulations with random topographic noise added with various length scales and with amplitudes tuned to the uncertainty of the Bedmap2 data set. Total Antarctic ice sheet retreat in these simulations varies between 12.6 and 17.9m equivalent sea level rise after 3kyrs of warm climate forcing. This study highlights the sensitivity of ice sheet models to existing uncertainties in bedrock elevation and the ongoing need for new data acquisition. Key Points Quantify how Antarctic bed elevation uncertainty affects ice sheet simulations Simulate retreat of the Antarctic ice sheet for a warm Pliocene climate Identify key areas for future improvements to bed elevation data. |
format |
Article in Journal/Newspaper |
author |
Gasson, E. DeConto, R. Pollard, D. |
spellingShingle |
Gasson, E. DeConto, R. Pollard, D. Antarctic bedrock topography uncertainty and ice sheet stability |
author_facet |
Gasson, E. DeConto, R. Pollard, D. |
author_sort |
Gasson, E. |
title |
Antarctic bedrock topography uncertainty and ice sheet stability |
title_short |
Antarctic bedrock topography uncertainty and ice sheet stability |
title_full |
Antarctic bedrock topography uncertainty and ice sheet stability |
title_fullStr |
Antarctic bedrock topography uncertainty and ice sheet stability |
title_full_unstemmed |
Antarctic bedrock topography uncertainty and ice sheet stability |
title_sort |
antarctic bedrock topography uncertainty and ice sheet stability |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
https://eprints.whiterose.ac.uk/98022/ https://eprints.whiterose.ac.uk/98022/1/Gasson2015.pdf https://doi.org/10.1002/2015GL064322 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_relation |
https://eprints.whiterose.ac.uk/98022/1/Gasson2015.pdf Gasson, E., DeConto, R. and Pollard, D. (2015) Antarctic bedrock topography uncertainty and ice sheet stability. Geophysical Research Letters, 42 (13). pp. 5372-5377. ISSN 0094-8276 |
op_doi |
https://doi.org/10.1002/2015GL064322 |
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Geophysical Research Letters |
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42 |
container_issue |
13 |
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5372 |
op_container_end_page |
5377 |
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1766261224111079424 |