Research on vertical spatial characteristic of satellite infrared hyperspectral atmospheric sounding data

Spatial characteristic is an important indicator of remote sensor performance,and space-borne infrared hyperspectral sounder is the frontier of atmospheric vertical sounding technology.In this paper,the formation mechanism of the vertical spatial characteristics involved in the space-borne infrared hyperspectral sounding data are analyzed in detail,which shows that the vertical spatial characteristics of sounding data depends not only on the spectral channels and their waveband coverage,but also the specific atmospheric parameter and its specific variation interested.The indicators of vertical spatial characteristics are defined and their mathematical models are established based on the mechanism analyses.These models are applied to the vertical spatial characteristic evaluation of atmospheric temperature sounding for FY-4A GIIRS,which is the first space-borne infrared hyperspectral atmospheric sounder in geostationary orbit.It is concluded that FY-4A GIIRS can sound the vertical temperature distribution in whole troposphere and lower stratosphere with height<35 km.This study can provide basic information to support the improvement of infrared hyperspectral sounder and the trace of vertical spatial characteristics of atmospheric inversion products.

风云三号卫星微波大气温度探测仪资料偏差订正方法研究

为推动中国风云三号卫星（FY-3A／B）资料在区域数值天气预报中的同化研究，重点研究FY-3A的大气温度垂直探测仪（MWTS）资料的偏差订正问题。在欧洲中期天气预报中心（ECMWF）原全球TOVS辐射偏差订正方案的基础上，结合MWTS资料特征，建立适用于FY-3A卫星MWTS辐射率资料的偏差订正系统，并评价MWTS的偏差订正效果。结果表明：（1）同纬度带和扫描位置的扫描偏差不同，各通道表现出不同的偏差特征，通道1扫描偏差较大（0～5K），通道2、3、4较小（0～0．6K）；（2）扫描偏差订正和气团偏差订正后的观测残差基本符合均值为零的正态分布；（3）偏差订正后的观测残差标准方差有所降低，这将提高卫星资料对分析场的调整。证明了FY-3A MWTS资料质量较好，具有同化应用的潜力，开发的偏差订正系统可为FY-3A MWTS资料在区域模式中的同化应用提供条件。