Comparison of Special Sensor Microwave Imager and buoy-measured wind speeds from 1987 to 1997

We compare wind speeds derived from microwave radiometer measurements made by the Special Sensor Microwave Imager (SSM/I) series of satellite instrume nts to those directly measured by buoy-mounted anemometers. The mean differ ence between SSM/I and buoy winds is typically <0.4 m s(-1) when averaged o ver all operational Tropical Atmosphere-Ocean and National Data Buoy Center buoys for a given year, and the standard deviation is <1.4 m s(-1). Mean e rrors for a given satellite-buoy pair typically range from -1 to +1 m s(-1) , with standard deviations <1.4 m s(-1). Two methods of converting buoy-mea sured wind speed to a standard value measured at a height of 10 m are compa red. We find that the principal difference between a simple logarithmic cor rection and a more detailed conversion to 10 m equivalent neutral stability wind speed is a shift of wind speed by about 0.12 m s(-1) with no change i n the distribution of SSM/I-buoy wind speed differences.