Time variability of the Earth's gravity field: Hydrological and oceanic effects and their possible detection using GRACE

Edited: 2011-02-21
TitleTime variability of the Earth's gravity field: Hydrological and oceanic effects and their possible detection using GRACE
Publication TypeJournal Article
Year of Publication1998
AuthorsWahr, J. M., M. Molenaar, and F. Bryan
JournalJournal of Geophysical Research
Volume103
Pagination30205-30230
Date Published12/1998
Keywordsatmospheric_pressure, grace
AbstractThe GRACE satellite mission, scheduled for launch in 2001, is designed to map out the Earth's gravity field to high accuracy every 2-4 weeks over a nominal lifetime of 5 years. Changes in the gravity field are caused by the redistribution of mass within the Earth and on or above its surface. GRACE will thus be able to constrain processes that involve mass redistribution. In this paper we use output from hydrological, oceanographic, and atmospheric models to estimate the variability in the gravity field (i.e., in the geoid) due to those sources. We develop a method for constructing surface mass estimates from the GRACE gravity coefficients. We show the results of simulations, where we use synthetic GRACE gravity data, constructed by combining estimated geophysical signals and simulated GRACE measurement errors, to attempt to recover hydrological and oceanographic signals. We show that GRACE may be able to recover changes in continental water storage and in seafloor pressure, at scales of a few hundred kilometers and larger and at timescales of a few weeks and longer, with accuracies approaching 2 mm in water thickness over land, and 0.1 mbar or better in seafloor pressure.
URLhttp://adsabs.harvard.edu/abs/1998JGR...10330205W
DOI10.1029/98JB02844