Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates
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 time period January 2003 to September 2012. Satellite gravimetry estimates of the AIS mass balance are strongly influenced by...
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Language: | English |
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Copernicus Publications
2013
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Online Access: | https://doi.org/10.5194/tc-7-1499-2013 http://www.the-cryosphere.net/7/1499/2013/tc-7-1499-2013.pdf https://doaj.org/article/f86dd21360fc4f66adcfeb8042948efb |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:f86dd21360fc4f66adcfeb8042948efb 2023-05-15T13:24:13+02:00 Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates I. Sasgen H. Konrad E. R. Ivins M. R. Van den Broeke J. L. Bamber Z. Martinec V. Klemann 2013-09-01 https://doi.org/10.5194/tc-7-1499-2013 http://www.the-cryosphere.net/7/1499/2013/tc-7-1499-2013.pdf https://doaj.org/article/f86dd21360fc4f66adcfeb8042948efb en eng Copernicus Publications doi:10.5194/tc-7-1499-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/1499/2013/tc-7-1499-2013.pdf https://doaj.org/article/f86dd21360fc4f66adcfeb8042948efb undefined The Cryosphere, Vol 7, Iss 5, Pp 1499-1512 (2013) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/tc-7-1499-2013 2023-01-22T18:03:24Z 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 time period January 2003 to September 2012. 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 estimate of apparent mass change of 53 ± 18 Gt yr−1. Therefore, our AIS mass balance of −114 ± 23 Gt yr−1 is less negative than previous GRACE estimates. The northern Antarctic Peninsula and the Amundsen Sea sector exhibit the largest mass loss (−26 ± 3 Gt yr−1 and −127 ± 7 Gt yr−1, respectively). In contrast, East Antarctica exhibits a slightly positive mass balance (26 ± 13 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, 6% of the area constitutes about half the AIS imbalance, contributing 151 ± 7 Gt yr−1 (ca. 0.4 mm yr−1) to global mean sea-level change. Most of this imbalance is caused by ice-dynamic speed-up expected to prevail in the near future. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Enderby Land George V Land Ice Sheet The Cryosphere Unknown Amundsen Sea Antarctic Antarctic Peninsula East Antarctica George V Land ENVELOPE(148.000,148.000,-68.500,-68.500) The Antarctic The Cryosphere 7 5 1499 1512 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir I. Sasgen H. Konrad E. R. Ivins M. R. Van den Broeke J. L. Bamber Z. Martinec V. Klemann Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
topic_facet |
geo envir |
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 time period January 2003 to September 2012. 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 estimate of apparent mass change of 53 ± 18 Gt yr−1. Therefore, our AIS mass balance of −114 ± 23 Gt yr−1 is less negative than previous GRACE estimates. The northern Antarctic Peninsula and the Amundsen Sea sector exhibit the largest mass loss (−26 ± 3 Gt yr−1 and −127 ± 7 Gt yr−1, respectively). In contrast, East Antarctica exhibits a slightly positive mass balance (26 ± 13 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, 6% of the area constitutes about half the AIS imbalance, contributing 151 ± 7 Gt yr−1 (ca. 0.4 mm yr−1) to global mean sea-level change. Most of this imbalance is caused by ice-dynamic speed-up expected to prevail in the near future. |
format |
Article in Journal/Newspaper |
author |
I. Sasgen H. Konrad E. R. Ivins M. R. Van den Broeke J. L. Bamber Z. Martinec V. Klemann |
author_facet |
I. Sasgen H. Konrad E. R. Ivins M. R. Van den Broeke J. L. Bamber Z. Martinec V. Klemann |
author_sort |
I. Sasgen |
title |
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
title_short |
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
title_full |
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
title_fullStr |
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
title_full_unstemmed |
Antarctic ice-mass balance 2003 to 2012: regional reanalysis of GRACE satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on GPS uplift rates |
title_sort |
antarctic ice-mass balance 2003 to 2012: regional reanalysis of grace satellite gravimetry measurements with improved estimate of glacial-isostatic adjustment based on gps uplift rates |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-1499-2013 http://www.the-cryosphere.net/7/1499/2013/tc-7-1499-2013.pdf https://doaj.org/article/f86dd21360fc4f66adcfeb8042948efb |
long_lat |
ENVELOPE(148.000,148.000,-68.500,-68.500) |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica George V Land The Antarctic |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula East Antarctica George V Land The Antarctic |
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, Vol 7, Iss 5, Pp 1499-1512 (2013) |
op_relation |
doi:10.5194/tc-7-1499-2013 1994-0416 1994-0424 http://www.the-cryosphere.net/7/1499/2013/tc-7-1499-2013.pdf https://doaj.org/article/f86dd21360fc4f66adcfeb8042948efb |
op_rights |
undefined |
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_ |
1766378101656256512 |