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Abstract

Hydrological processes cause variations in gravitational
potential and surface deformations, both of which are
detectable using space geodetic techniques. We computed
elastic deformation using continental water load estimates
derived from the Gravity Recovery and Climate Experiment
and compared to 3D deformation estimated from GPS
observations. The agreement is very good in areas where
large hydrologic signals occur over broad spatial scales,
with correlation in horizontal components as high as 0.9.
Agreement is also observed at smaller scales, including
across Europe. This suggests that: a) both techniques are
perhaps more accurate than previously thought and b) a
large percentage of the non-linear variations seen in our
GPS time series are most likely related to geophysical
processes rather than analysis error. Low correlation at
some sites suggests that local processes or site specific
analysis errors dominate the GPS deformation estimates
rather than the broad-scale hydrologic signals detected by
GRACE.

Item Type:	Article
Authors/Creators:	Tregoning, P and Watson, CS and Ramillien, G and McQueen, H and Zhang, J
Journal or Publication Title:	Geophysical Research Letters
ISSN:	0094-8276
DOI / ID Number:	10.1029/2009GL038718
Additional Information:	Copyright 2009 by the American Geophysical Union.
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