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Detecting hydrologic deformation using GRACE and GPS
Citation
Tregoning, P and Watson, C and Ramillien, G and McQueen, H and Zhang, J, Detecting hydrologic deformation using GRACE and GPS, Geophysical Research Letters, 36, (15) EJ ISSN 0094-8276 (2009) [Refereed Article]
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Copyright Statement
Copyright 2009 by the American Geophysical Union
Official URL: http://www.agu.org/journals/gl/
Abstract
Hydrological processes cause variations in gravitational
potential and surface deformations, both of which are de-
tectable using space geodetic techniques. We computed elas-
tic deformation using continental water load estimates de-
rived from the Gravity Recovery and Climate Experiment
and compared to 3D deformation estimated from GPS ob-
servations. The agreement is very good in areas where large
hydrologic signals occur over broad spatial scales, with cor-
relation 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 percent-
age 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 hy-
drologic signals detected by GRACE.
Item Details
Item Type: | Refereed Article |
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Keywords: | hydrologic deformation, Gravity Recovery and Climate Experiment (GRACE), GPS deformation, surface mass |
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | Watson, C (Dr Christopher Watson) |
ID Code: | 57203 |
Year Published: | 2009 |
Web of Science® Times Cited: | 154 |
Deposited By: | Geography and Environmental Studies |
Deposited On: | 2009-06-24 |
Last Modified: | 2013-02-26 |
Downloads: | 1 View Download Statistics |
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