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Author
Andersen, O.B.; Hinderer, J.
Title
Global inter-annual gravity changes from GRACE: Early results
Type
Journal Article
Year
2005
Publication
Geophysical research letters
Abbreviated Journal
Volume
32
Issue
Pages
Keywords
1217 Geodesy and Gravity: Time variable gravity; 1855 Hydrology: Remote sensing; 1640 Global Change: Remote sensing; 1655 Global Change: Water cycles
Abstract
Fifteen monthly gravity field solutions from the GRACE twin satellites launched more than two years ago have been studied to estimate gravity field changes between 2002 and 2003.The results demonstrate that GRACE is capable of capturing the changes in ground water on inter-annual scales with an accuracy of 0.4 ?Gal corresponding to 9 mm water thickness on spatial scales longer than 1300 km. Four of the most widely used global hydrological models have been investigated for their spatial comparison with GRACE observations of inter-annual gravity field variations due to changes in continental water storage. The Global Land Data Assimilation System model has a spatial correlation coefficient with GRACE observations of 0.65 over the northern hemisphere. This demonstrates that the observed gravity field changes on these scales are largely related to changes in continental water storage.
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337
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American Geophysical Union
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Summary Language
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Series Editor
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Edition
ISSN
0094-8276
ISBN
Medium
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Conference
Notes
Approved
yes
Call Number
IPEV @ Thierry.Lemaire @
Serial
5596
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