A Preliminary Assessment of the Impact of Assimilating Satellite Soil Moisture Data Products on NCEP Global Forecast System

Table 1

Top layer soil moisture (fractional) validation with USDA-SCAN ground measurements during a period from 1 to 30 April 2012.

	East CONUS (26 sites)			West CONUS (25 sites)			Whole CONUS
	RMSE	Bias	Correlation coefficient	RMSE	Bias	Correlation coefficient	RMSE	Bias	Correlation coefficient
CTL	0.135	0.046	0.565	0.124	0.033	0.448	0.129	0.040	0.508
EnKF	0.130	−0.031	0.613	0.114	−0.021	0.549	0.123	−0.026	0.587
SMOPS	0.133	−0.055	0.601	0.098	−0.036	0.402	0.117	−0.048	0.524

There are 26 sites for ground measurements over the east CONUS and 25 sites over the west CONUS. Unit: kg/kg.