基于风云3C卫星双氧通道的云检测算法

A Cloud Detection Algorithm Based on FY-3C Satellite Double O_2 Channels

风云3C卫星微波湿度计（MWHS）增加一组频点为118.75 GHz的氧气吸收通道,该组探测通道与微波湿度计（MWTS）中的50~60 GHz的氧气吸收通道综合发展一种云检测方法。应用高频和低频通道对云的散射作用不同的原理,利用在根据双氧通道之间在晴空条件下的关系,进而发展出的一种综合的云检测方法。

A new group of 02 absorption channels with frequency at 118.75 GHz was added in the new Micro- wave Humidity Sounder instrument onboard the Feng-Yun 3C satellite. And a comprehensive cloud detection scheme can be developed by combining the O2 absorption channels with frequencies ranging from 50 to 60 GHz in MWTS and the ones in MWHS. Since the high frequency and low frequency have the different performance on the scattering of cloud, meanwhile, based on the relationship of double 02 sounding channels under the clear sky con- dition, a new cloud detection scheme is developed.