Abstract
An improved algorithm to estimate rainfall over the oceans, utilising the observations made by the Special Sensor Microwave/Imager (SSM/I) radiometer at 37 GHz, is developed. The algorithm is based on an earlier analysis that included the satellite microwave data from SSM/I and the Scanning Multichannel Microwave Radiometer (SMMR), and the radar data obtained during the GATE experiment. The modified algorithm was tested by comparing the SSM/I-derived rainfall with the corresponding values obtained by radar and rain gauges in the framework of the GPCP programme, over the seas around Japan. While good agreement of ±25% is obtained in this test, the analysis of the results suggests that further improvements are possible. An attempt to separate rain originated from convective and stratiform clouds is made, based on multichannel measurements obtained from SSM/I.
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