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Assimilation of remotely sensed soil moisture into a hydrologic model

We discuss the assimilation of remotely sensed soil brightness temperature into a runoff prediction model. Data used in this study was acquired during the 2002 Soil Moisture Experiments (SMEX02) near Ames, IA. The Passive and Active L- and S-band (PALS) instrument was flown for six days of the study before and after a major rain event in the region. We combine a radiative transfer model and observed PALS brightness temperatures to estimate soil moisture within the top five centimeters over watershed. These estimates are assimilated into the active soil layer in a distributed runoff model. Runoff estimates are compared to observed stream gauge measurements within the watershed