Climate-driven deformation of the solid Earth from GRACE and GPS

Details Climate-driven deformation of the solid Earth from GRACE and GPS Climate-driven deformation of the solid Earth from GRACE and GPS

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124605d&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 24, CiteID L24605

Physics

36

Geodesy And Gravity: Geopotential Theory And Determination, Geodesy And Gravity: Crustal Movements-Intraplate (8110), Geodesy And Gravity: Reference Systems, Geodesy And Gravity: Space Geodetic Surveys, Hydrology: Hydroclimatology

Scientific paper

GRACE data indicate large seasonal variations in gravity that are assumed to be related to climate-driven fluxes of surface water. Seasonal redistribution of surface mass should deform the Earth, and our calculations using GRACE data suggest vertical deformations of ~13 mm in the region of greatest flux, the Amazon River Basin. To test the GRACE gravity-hydrology connection, we analyzed GPS data acquired from sites in this region. After accounting for degree 1 variations not observable with GRACE, we find that annual deformation measured with GPS correlates highly with predictions calculated from GRACE measurements. These results confirm the variations in surface water sensed by GRACE, which are significantly larger than those predicted by some hydrology models. The results also demonstrate that GRACE can be an important tool for monitoring deformation of the Earth, and suggest that combined analysis of GRACE and GPS may be a useful approach for estimation of geocenter variations.

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