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Ice mass change in Greenland and Antarctica between 1993 and 2013 from satellite gravity measurements

Talpe, Matthieu J., Nerem, R. Steven, Forootan, Ehsan, Schmidt, Michael, Lemoine, Frank G., Enderlin, Ellyn M. and Landerer, Felix W. 2017. Ice mass change in Greenland and Antarctica between 1993 and 2013 from satellite gravity measurements. Journal of Geodesy 91 (11) , pp. 1283-1298. 10.1007/s00190-017-1025-y

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Abstract

We construct long-term time series of Greenland and Antarctic ice sheet mass change from satellite gravity measurements. A statistical reconstruction approach is developed based on a Principal Component Analysis to combine high-resolution spatial modes from the Gravity Recovery and Climate Experiment (GRACE) mission with the gravity information from conventional satellite track-ing data. Uncertainties of this reconstruction are rigorously assessed; they include temporal limitations for short GRACE measurements, spatial limitations for the low-resolution conventional tracking data measurements, and limitations of the estimated statistical relationships between low and high degree potential coe�cients re ected in the PCA modes. Trends of mass variations in Greenland and Antarctica are assessed against a number of previous studies. The resulting time series for Greenland show a higher rate of mass loss than other methods before 2000, while the Antarctic ice sheet appears heavily in uenced by interannual variations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Uncontrolled Keywords: time-variable Gravity � Mass Change � Greenland � Antarctica
Publisher: Springer Verlag
ISSN: 0949-7714
Date of First Compliant Deposit: 15 May 2017
Date of Acceptance: 18 April 2017
Last Modified: 24 Apr 2018 18:55
URI: http://orca.cf.ac.uk/id/eprint/100560

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