Basin scale estimates of evapotranspiration using GRACE and other observations

Details Basin scale estimates of evapotranspiration using GRACE and other observations Basin scale estimates of evapotranspiration using GRACE and other observations

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3120504r&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 20, CiteID L20504

Mathematics

Logic

66

Global Change: Remote Sensing, Hydrology: Evapotranspiration, Hydrology: Hydrologic Budget (1655), Meteorology And Atmospheric Dynamics: Numerical Modeling And Data Assimilation

Scientific paper

Evapotranspiration is integral to studies of the Earth system, yet it is difficult to measure on regional scales. One estimation technique is a terrestrial water budget, i.e., total precipitation minus the sum of evapotranspiration and net runoff equals the change in water storage. Gravity Recovery and Climate Experiment (GRACE) satellite gravity observations are now enabling closure of this equation by providing the terrestrial water storage change. Equations are presented here for estimating evapotranspiration using observation based information, taking into account the unique nature of GRACE observations. GRACE water storage changes are first substantiated by comparing with results from a land surface model and a combined atmospheric-terrestrial water budget approach. Evapotranspiration is then estimated for 14 time periods over the Mississippi River basin and compared with output from three modeling systems. The GRACE estimates generally lay in the middle of the models and may provide skill in evaluating modeled evapotranspiration.

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