Ice mass change in Greenland and Antarctica between 1993 and 2013 from satellite gravity measurements |
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| Authors: | Matthieu J. Talpe R. Steven Nerem Ehsan Forootan Michael Schmidt Frank G. Lemoine Ellyn M. Enderlin Felix W. Landerer |
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| Affiliation: | 1.Aerospace Engineering Sciences,University of Colorado Boulder, Colorado Center for Astrodynamics Research,Boulder,USA;2.School of Earth and Ocean Sciences,Cardiff University,Cardiff,UK;3.Deutsches Geod?tisches Forschungsinstitut (DGFI),Technische Universit?t München,Munich,Germany;4.Planetary Geodynamics Laboratory,NASA Goddard Space Flight Center,Greenbelt,USA;5.Climate Change Institute,University of Maine,Orono,USA;6.Jet Propulsion Laboratory,California Institute of Technology,Pasadena,USA |
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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 (PCA) to combine high-resolution spatial modes from the Gravity Recovery and Climate Experiment (GRACE) mission with the gravity information from conventional satellite tracking 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 coefficients reflected 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 influenced by interannual variations. |
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