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Spatial and Temporal Antarctic Ice Sheet Mass Trends, Glacio-Isostatic Adjustment, and Surface Processes from a Joint Inversion of Satellite Altimeter, Gravity, and GPS DataWe present spatiotemporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic-corrected GPS data for the period 2003-2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time-invariant solution for glacio-isostatic adjustment while remaining largely independent of forward models. We establish that over the period 2003-2013, Antarctica has been losing mass at a rateof -84 +/- 22 Gt per yr, with a sustained negative mean trend of dynamic imbalance of -111 +/- 13 Gt per yr. West Antarctica is the largest contributor with -112 +/- 10 Gt per yr, mainly triggered by high thinning rates of glaciers draining into the Amundsen Sea Embayment. The Antarctic Peninsula has experienced a dramatic increase in mass loss in the last decade, with a mean rate of -28 +/- 7 Gt per yr and significantly higher values for the most recent years following the destabilization of the Southern Antarctic Peninsula around 2010. The total mass loss is partly compensated by a significant mass gain of 56 +/- 18 Gt per yr in East Antarctica due to a positive trend of surface mass balance anomalies.
Document ID
20170002775
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Martin-Espanol, Alba (Bristol Univ. United Kingdom)
Zammit-Mangion, Andrew (Bristol Univ. United Kingdom)
Clarke, Peter J. (Newcastle-upon-Tyne Univ. Newcastle, United Kingdom)
Flament, Thomas (Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales Toulouse, France)
Helm, Veit (Alfred-Wegener-Inst. for Polar Research Bremerhaven, Germany)
King, Matt A. (Newcastle-upon-Tyne Univ. Newcastle, United Kingdom)
Luthcke, Scott B. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Petrie, Elizabeth (Newcastle-upon-Tyne Univ. Newcastle, United Kingdom)
Remy, Frederique (Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales Toulouse, France)
Schon, Nana (Bristol Univ. United Kingdom)
Wouters, Bert (Bristol Univ. United Kingdom)
Bamber, Jonathan L. (Bristol Univ. United Kingdom)
Date Acquired
March 31, 2017
Publication Date
February 3, 2016
Publication Information
Publication: Journal of Geophysical Research: Earth Surface
Volume: 121
Issue: 2
ISSN: 2169-9003
Subject Category
Earth Resources and Remote Sensing
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN40665
Funding Number(s)
CONTRACT_GRANT: NE/l027401/1
CONTRACT_GRANT: NSF EAR-0735156
CONTRACT_GRANT: FT110100207
Distribution Limits
Public
Copyright
Other