气候变化领域集成服务门户(CCPortal): 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

CCPortal

DOI	10.5194/tc-7-1499-2013
	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
	Sasgen I.; Konrad H.; Ivins E.R.; Van Den Broeke M.R.; Bamber J.L.; Martinec Z.; Klemann V.
发表日期	2013
ISSN	19940416
卷号	7 期号:5
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).
学科领域	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
语种	英语
scopus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
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120248
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
推荐引用方式 GB/T 7714	Sasgen I.,Konrad H.,Ivins E.R.,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],2013,7(5).
APA	Sasgen I..,Konrad H..,Ivins E.R..,Van Den Broeke M.R..,Bamber J.L..,...&Klemann V..(2013).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.Cryosphere,7(5).
MLA	Sasgen I.,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".Cryosphere 7.5(2013).