globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-7-1499-2013
Scopus记录号: 2-s2.0-84885136133
论文题名:
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
作者: Sasgen I; , Konrad H; , Ivins E; R; , Van Den Broeke M; R; , Bamber J; L; , Martinec Z; , Klemann V
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期:5
起始页码: 1499
结束页码: 1512
语种: 英语
英文关键词: annual variation ; glacier mass balance ; glacioisostasy ; GPS ; GRACE ; ice sheet ; satellite imagery ; sea level change ; uplift ; Amundsen Sea ; Antarctic Peninsula ; Antarctica ; East Antarctica ; Southern Ocean ; West Antarctica
英文摘要: 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. © 2013 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74936
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Department of Geodesy and Remote Sensing, GFZ German Research Centre for Geosciences, Telegrafenberg A20, 14473 Potsdam, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, United States; Institute for Marine and Atmospheric Research, Utrecht University, 3508 TA Utrecht, Netherlands; School of Geographical Sciences, University of Bristol, University Road, Bristol BS8 1SS, United Kingdom; School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 4, Ireland; National Oceanography Centre, 6 Brownlow Street, Liverpool L3 5DA, United Kingdom

Recommended Citation:
Sasgen I,, Konrad H,, Ivins E,et al. 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[J]. Cryosphere,2013-01-01,7(5)
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