Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment
We present regional-scale mass balances for 25 drainage basins of the Antarctic Ice Sheet (AIS) from satellite observations of the Gravity and Climate Experiment (GRACE) for the years 2002–2011. Satellite gravimetry estimates of the AIS mass balance are strongly influenced by mass movement in the Ea...
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2013
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_245637 2023-05-15T13:24:12+02:00 Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment Sasgen, I. Konrad, H. Ivins, E. van den Broeke, M. Bamber, J. Martinec, Z. Klemann, V. 2013 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637_1/component/file_245636/19084.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-7-1499-2013 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637_1/component/file_245636/19084.pdf info:eu-repo/semantics/openAccess The Cryosphere 550 - Earth sciences info:eu-repo/semantics/article 2013 ftgfzpotsdam https://doi.org/10.5194/tc-7-1499-2013 2022-09-14T05:53:32Z We present regional-scale mass balances for 25 drainage basins of the Antarctic Ice Sheet (AIS) from satellite observations of the Gravity and Climate Experiment (GRACE) for the years 2002–2011. Satellite gravimetry estimates of the AIS mass balance are strongly influenced by mass movement in the Earth interior caused by ice advance and retreat during the last glacial cycle. Here, we develop an improved glacial-isostatic adjustment (GIA) estimate for Antarctica using newly available GPS uplift rates, allowing us to more accurately separate GIA-induced trends in the GRACE gravity fields from those caused by current imbalances of the AIS. Our revised GIA estimate is considerably lower than previous predictions, yielding an (upper) estimate of apparent mass change of 48 ± 18 Gt yr−1. Therefore, our AIS mass balance of −103 ± 23 Gt yr−1 is considerably less negative than previous GRACE estimates. The Northern Antarctic Peninsula and the Amundsen Sea Sector exhibit the largest mass loss (−25 ± 6 Gt yr−1 and −126 ± 11 Gt yr−1, respectively). In contrast, East Antarctica exhibits a slightly positive mass balance (19 ± 16 Gt yr−1), which is, however, mostly the consequence of compensating mass anomalies in Dronning Maud and Enderby Land (positive) and Wilkes and George V Land (negative) due to interannual accumulation variations. In total, 7% of the area constitute more than half of the AIS imbalance (53%), contributing −151 ± 9 Gt yr−1 to global mean sea-level change. Most of this imbalance is caused by long-term ice-dynamic speed up expected to prevail in the future. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Enderby Land George V Land Ice Sheet The Cryosphere GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic The Antarctic Antarctic Peninsula East Antarctica Amundsen Sea George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) The Cryosphere 7 5 1499 1512 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
topic |
550 - Earth sciences |
spellingShingle |
550 - Earth sciences Sasgen, I. Konrad, H. Ivins, E. van den Broeke, M. Bamber, J. Martinec, Z. Klemann, V. Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
topic_facet |
550 - Earth sciences |
description |
We present regional-scale mass balances for 25 drainage basins of the Antarctic Ice Sheet (AIS) from satellite observations of the Gravity and Climate Experiment (GRACE) for the years 2002–2011. Satellite gravimetry estimates of the AIS mass balance are strongly influenced by mass movement in the Earth interior caused by ice advance and retreat during the last glacial cycle. Here, we develop an improved glacial-isostatic adjustment (GIA) estimate for Antarctica using newly available GPS uplift rates, allowing us to more accurately separate GIA-induced trends in the GRACE gravity fields from those caused by current imbalances of the AIS. Our revised GIA estimate is considerably lower than previous predictions, yielding an (upper) estimate of apparent mass change of 48 ± 18 Gt yr−1. Therefore, our AIS mass balance of −103 ± 23 Gt yr−1 is considerably less negative than previous GRACE estimates. The Northern Antarctic Peninsula and the Amundsen Sea Sector exhibit the largest mass loss (−25 ± 6 Gt yr−1 and −126 ± 11 Gt yr−1, respectively). In contrast, East Antarctica exhibits a slightly positive mass balance (19 ± 16 Gt yr−1), which is, however, mostly the consequence of compensating mass anomalies in Dronning Maud and Enderby Land (positive) and Wilkes and George V Land (negative) due to interannual accumulation variations. In total, 7% of the area constitute more than half of the AIS imbalance (53%), contributing −151 ± 9 Gt yr−1 to global mean sea-level change. Most of this imbalance is caused by long-term ice-dynamic speed up expected to prevail in the future. |
format |
Article in Journal/Newspaper |
author |
Sasgen, I. Konrad, H. Ivins, E. van den Broeke, M. Bamber, J. Martinec, Z. Klemann, V. |
author_facet |
Sasgen, I. Konrad, H. Ivins, E. van den Broeke, M. Bamber, J. Martinec, Z. Klemann, V. |
author_sort |
Sasgen, I. |
title |
Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
title_short |
Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
title_full |
Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
title_fullStr |
Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
title_full_unstemmed |
Antarctic ice-mass balance 2002 to 2011: regional re-analysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
title_sort |
antarctic ice-mass balance 2002 to 2011: regional re-analysis of grace satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment |
publishDate |
2013 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637_1/component/file_245636/19084.pdf |
long_lat |
ENVELOPE(148.000,148.000,-68.500,-68.500) |
geographic |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Amundsen Sea George V Land |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula East Antarctica Amundsen Sea George V Land |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Enderby Land George V Land Ice Sheet The Cryosphere |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Enderby Land George V Land Ice Sheet The Cryosphere |
op_source |
The Cryosphere |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-7-1499-2013 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637 https://gfzpublic.gfz-potsdam.de/pubman/item/item_245637_1/component/file_245636/19084.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-7-1499-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
5 |
container_start_page |
1499 |
op_container_end_page |
1512 |
_version_ |
1766378010292781056 |