Global assimilation of satellite surface soil moisture retrievals into the NASA Catchment land surface model

Mathematics – Logic

Scientific paper

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Hydrology: Soil Moisture, Atmospheric Processes: Data Assimilation, Hydrology: Land/Atmosphere Interactions (1218, 1631, 3322), Hydrology: Remote Sensing (1640), Hydrology: Estimation And Forecasting

Scientific paper

Global retrievals of surface soil moisture from the Scanning Multichannel Microwave Radiometer for the period 1979-87 are assimilated into the NASA Catchment land surface model as it is driven with surface meteorological data derived from observations. Validation against ground-based measurements in Eurasia and North America from the Global Soil Moisture Data Bank demonstrates a long assumed (but rarely proven) property of soil moisture fields derived from data assimilation - that the assimilation product is superior to either satellite data or model data alone. An analysis of the innovations reveals that the filter is only partially operating within its underlying assumptions and offers clues how spatially distributed model error parameters could further enhance filter performance.

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