Simulation of TRMM observation using Radar-AMeDAS composites

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説明

Sampling errors of rainfall estimates due to TRMM (Tropical Rainfall Measuring Mission) satellite is estimated by using Radar-AMeDAS (Automatic Meteorological Data Acquisition System) rainfall data around Japan, which is a composite radar-rainfall estimate validated by dense surface rain gauge network(AMeDAS). In this study, sampling of monthly rainfall errors were estimated over 5/spl degspl times/5/spl deg/ domain by using a 43 months's time-series of Radar-AMeDAS data, and it is concluded that the sampling error around Japan is about 16% when TRMM Microwave Imager (TMI) and TRMM Precipitation Radar(PR) can be used and about 20% when only PR can be available. Obtained results were relatively larger than the previous studies, because it is based on long term real data around Japan. There are seasonal differences of sampling errors in Japan. The errors are smaller in summer rainy season than in winter. The dependency on averaged area size is also investigated. >

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