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Geophysics
Contribution of climate-driven change in continental water storage to recent sea-level rise



*U.S. Geological Survey, Geophysical Fluid Dynamics Laboratory/National Oceanic and Atmospheric Administration, P.O. Box 308, Princeton, NJ 08534; and
Laboratoire d'Etudes en Geophysique et Oceanographie Spatiales, Centre National d'Etudes Spatiales, 31400 Toulouse, France
Edited by Carl Wunsch, Massachusetts Institute of Technology, Cambridge, MA and approved August 26, 2003 (received for review June 28, 2003)
Using a global model of continental water balance, forced by interannual variations in precipitation and near-surface atmospheric temperature for the period 19811998, we estimate the sea-level changes associated with climate-driven changes in storage of water as snowpack, soil water, and ground water; storage in ice sheets and large lakes is not considered. The 19811998 trend is estimated to be 0.12 mm/yr, and substantial interannual fluctuations are inferred; for 19931998, the trend is 0.25 mm/yr. At the decadal time scale, the terrestrial contribution to eustatic (i.e., induced by mass exchange) sea-level rise is significantly smaller than the estimated steric (i.e., induced by density changes) trend for the same period, but is not negligibly small. In the model the sea-level rise is driven mainly by a downtrend in continental precipitation during the study period, which we believe was generated by natural variability in the climate system.
Abbreviations: LaD, Land Dynamics; CMAP, Climate Prediction Center Merged Analysis of Precipitation; ISBA, Interactions between Soil, Biosphere, and Atmosphere.
To whom correspondence should be addressed. E-mail: cmilly{at}usgs.gov.
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