降水云含有水膜冰球时的微波辐亮温

利用Eddington近似解析算法和一含有冰水相态混合层的降水云模型，改变滴谱，并／或使云中冰球带上水膜，可以改变云内一些高度上的辐射通量，而对降水云在云顶和地面两处的射出辐亮温的影响，则与雨强和微波频率以及水膜冰球谱和水膜厚度有关。云中相态混合层内水成物相态和滴谱对6．6、10．7和18GHz辐射传输和射出辐亮温有较大的影响，对更高的频率（37．0、85．6和183GHz）影响较小。

MICROWAVE BRIGHTNESS TEMPERATURES FROM PRECIPITATING CLOUD WITH WATER-COATED ICE SPHERES

The algorithm of analytical solution to the microwave radiance based on the Eddington approximation has been used to study the effects on the radiation transfer of the hydrometeor spectra and water-coated ice spheres in a precipitating cloud with a layer in which both liquid and ice exist. The results have shown that radiant flux at some levels in the cloud would change if either the size spectrum changes or some of the ice spheres are coated with liquid water. Nevertheless, the variation in out-going brightness temperatures at the heights of the earth's surface and cloud top depends on rainfall rate, wavelength, size spectrum of water-coated ice spheres, and the thickness of the coat. Radiant transfer and out-going brightness temperatures at 6. 6, 10. 7 and 18GHz are influenced more significantly than at higher frequencies.