A new approach to estimate ice dynamic rates using satellite observations in East Antarctica
Mass balance changes of the Antarctic ice sheet are of significant interest due to its sensitivity to climatic changes and its contribution to changes in global sea level. While regional climate models successfully estimate mass input due to snowfall, it remains difficult to estimate the amount of m...
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ftcopernicus:oai:publications.copernicus.org:tc55989 2023-05-15T13:54:27+02:00 A new approach to estimate ice dynamic rates using satellite observations in East Antarctica Kallenberg, Bianca Tregoning, Paul Hoffmann, Janosch Fabian Hawkins, Rhys Purcell, Anthony Allgeyer, Sébastien 2018-09-27 application/pdf https://doi.org/10.5194/tc-11-1235-2017 https://tc.copernicus.org/articles/11/1235/2017/ eng eng doi:10.5194/tc-11-1235-2017 https://tc.copernicus.org/articles/11/1235/2017/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-11-1235-2017 2020-07-20T16:23:44Z Mass balance changes of the Antarctic ice sheet are of significant interest due to its sensitivity to climatic changes and its contribution to changes in global sea level. While regional climate models successfully estimate mass input due to snowfall, it remains difficult to estimate the amount of mass loss due to ice dynamic processes. It has often been assumed that changes in ice dynamic rates only need to be considered when assessing long-term ice sheet mass balance; however, 2 decades of satellite altimetry observations reveal that the Antarctic ice sheet changes unexpectedly and much more dynamically than previously expected. Despite available estimates on ice dynamic rates obtained from radar altimetry, information about ice sheet changes due to changes in the ice dynamics are still limited, especially in East Antarctica. Without understanding ice dynamic rates, it is not possible to properly assess changes in ice sheet mass balance and surface elevation or to develop ice sheet models. In this study we investigate the possibility of estimating ice sheet changes due to ice dynamic rates by removing modelled rates of surface mass balance, firn compaction, and bedrock uplift from satellite altimetry and gravity observations. With similar rates of ice discharge acquired from two different satellite missions we show that it is possible to obtain an approximation of the rate of change due to ice dynamics by combining altimetry and gravity observations. Thus, surface elevation changes due to surface mass balance, firn compaction, and ice dynamic rates can be modelled and correlated with observed elevation changes from satellite altimetry. Text Antarc* Antarctic Antarctica East Antarctica Ice Sheet Copernicus Publications: E-Journals Antarctic East Antarctica The Antarctic The Cryosphere 11 3 1235 1245 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Mass balance changes of the Antarctic ice sheet are of significant interest due to its sensitivity to climatic changes and its contribution to changes in global sea level. While regional climate models successfully estimate mass input due to snowfall, it remains difficult to estimate the amount of mass loss due to ice dynamic processes. It has often been assumed that changes in ice dynamic rates only need to be considered when assessing long-term ice sheet mass balance; however, 2 decades of satellite altimetry observations reveal that the Antarctic ice sheet changes unexpectedly and much more dynamically than previously expected. Despite available estimates on ice dynamic rates obtained from radar altimetry, information about ice sheet changes due to changes in the ice dynamics are still limited, especially in East Antarctica. Without understanding ice dynamic rates, it is not possible to properly assess changes in ice sheet mass balance and surface elevation or to develop ice sheet models. In this study we investigate the possibility of estimating ice sheet changes due to ice dynamic rates by removing modelled rates of surface mass balance, firn compaction, and bedrock uplift from satellite altimetry and gravity observations. With similar rates of ice discharge acquired from two different satellite missions we show that it is possible to obtain an approximation of the rate of change due to ice dynamics by combining altimetry and gravity observations. Thus, surface elevation changes due to surface mass balance, firn compaction, and ice dynamic rates can be modelled and correlated with observed elevation changes from satellite altimetry. |
format |
Text |
author |
Kallenberg, Bianca Tregoning, Paul Hoffmann, Janosch Fabian Hawkins, Rhys Purcell, Anthony Allgeyer, Sébastien |
spellingShingle |
Kallenberg, Bianca Tregoning, Paul Hoffmann, Janosch Fabian Hawkins, Rhys Purcell, Anthony Allgeyer, Sébastien A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
author_facet |
Kallenberg, Bianca Tregoning, Paul Hoffmann, Janosch Fabian Hawkins, Rhys Purcell, Anthony Allgeyer, Sébastien |
author_sort |
Kallenberg, Bianca |
title |
A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
title_short |
A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
title_full |
A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
title_fullStr |
A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
title_full_unstemmed |
A new approach to estimate ice dynamic rates using satellite observations in East Antarctica |
title_sort |
new approach to estimate ice dynamic rates using satellite observations in east antarctica |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-11-1235-2017 https://tc.copernicus.org/articles/11/1235/2017/ |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-11-1235-2017 https://tc.copernicus.org/articles/11/1235/2017/ |
op_doi |
https://doi.org/10.5194/tc-11-1235-2017 |
container_title |
The Cryosphere |
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11 |
container_issue |
3 |
container_start_page |
1235 |
op_container_end_page |
1245 |
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1766260324831330304 |