[en] Five years of global continental water storage variations are used to predict the effects of long-wavelength, long-period variability in water storage on gravity observations. At the sites of existing superconducting gravimeters, the modeled gravity changes have root-mean-square (RMS) values of as much as 7 mu Gals, with ranges of up to 22 mu Gals. Variations much larger than these values can be found over large regions the globe. We find that the gravity effects are predominantly annual in character. We also find that the modeled responses to water loading exhibit long-period variations that could be mistaken for secular tectonic trends when observed over a time span of a few years.
Disciplines :
Earth sciences & physical geography Physics
Identifiers :
UNILU:UL-ARTICLE-2008-843
Author, co-author :
van Dam, Tonie ; European Center for Geodynamics and Seismology and The Luxembourg National Museum of Natural History, Walferdange, Luxembourg
Wahr, John M.; Department of Physics and CIRES, University of Colorado, Boulder, Colorado
Milly, P. Chris D.; U.S. Geological Survey and GFDL/NOAA, Princeton, New Jersey