降雨時大気中のマイクロ波放射伝達過程のモデル化と,これによる海洋マイクロ波ラジオメトリ-観測精度の評価

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This paper proposes practical microwave, radiative transfer model of atmosphere with rain over wide range of rainfall rate from 0 to 50mm/hr, based on observational results. Typical atmospheric substances which interact with microwave are oxygen, water vapor, cloud water, and rain drop in this model. The typical distribution in the atmosphere was assumed for the first three substances, and rainfall rate was measured from ground-based and satellite measurements together with brightness temperature of atmosphere. The radiative transfer equation was solved in order to estimate absorption and scattering coefficients of rainfall, employing above data, and the microwave radiative transfer model, which takes account of multiple scattering effect of raindrop, was derived.This model was, in turn, applied to error estimation in microwave radiometeric observation of ocean. Sea surface temperature and sea surface wind were objective oceanic environmental parameters. It was noticed from the simulation that the atmospheric effect was of the most significance in observation of above parameters and we can conclude that the microwave observation would be useful in the case that the rainfall rate is at most up to 2mm/hr.
公益社団法人計測自動制御学会の論文