水汽、降水和逆温层与卫星红外测值的关系分析

Relationship between black body temperature and water vapour,precipitation and inversion layer

为了提高卫星遥感资料的应用水平,利用1996年和1997年南京地区23个主要降雨过程期间的GM S-5多通道资料,运用红外辐射传输的基本原理,在分析多通道亮温差的高度分布特征基础上,讨论了水汽的分布和逆温层的位置对卫星红外测值的影响情况及其成因,并讨论了亮温差与局地降水概率和强度的关系。结果表明,水汽的垂直分布是影响卫星红外测值的重要因子,逆温层的位置与多通道亮温差逆转密切相关。

In order to improve the application of the satellite data,with GMS-5 multi-channel data obtained from 23 main raining processes in Nanjing region in 1996 and 1997, the characters of multi-channel different TBB （DT） were analyzed with the principle of infrared radiation transfer, and then the influence of the water vapour distributing and the inversion layer position on the TBB and the reasons were discussed. Finally the relationship between the DT and the local precipitation probability and intensity also discussed. The result shows that the perpendicularity distributing of the vapor of water is an important factor which affects the black body temperature, and there is clese relationship between the inversion layer position and the multi-channel different TBB（DT）.