Journal
JOURNAL OF GEODYNAMICS
Volume 61, Issue -, Pages 120-128Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jog.2012.03.007
Keywords
Space gravimetry; Time-variable gravity; Trend estimation; Information criteria; Hypotheses testing
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Time-variable GRACE (Gravity Recovery and Climate Experiment) gravity field solutions are routinely exploited to derive secular and seasonal mass changes on and near the Earth's surface. However, the quantification of mass redistribution from space gravimetry is not a straightforward process. For instance, published linear deglaciation rates of the Greenland ice sheets vary from approximate to 100 Gt/yr to approximate to 300Gt/yr; the discrepancies are subject to applied methodologies, the considered gravity field time-series and the period of investigation. Furthermore, in the recent past discussion has come to the fore whether the temporal behavior of mass variation might be better represented by a second-order polynomial rather than a linear regression model. In summary, the degrees of freedom inherent to GRACE analysis make the detection of mass trends to become a delicate topic. This contribution sensitizes for a more careful review of trends derived from GRACE mass-variation time-series. We point to possible misinterpretation and propose rules that improve the consistency of results. (C) 2012 Elsevier Ltd. All rights reserved.
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