资源环境科技发展态势分析平台

Based on Global/Regional Assimilation and PrEdiction System‐Global Forecast System (GRAPES‐GFS) and actual Spectral Response Functions (SRFs) of three selected single‐passband channels (Channel 5, 6 and 7) of FengYun‐3D MicroWave Temperature Sounders‐2 (FY‐3D MWTS‐2), impacts of actual SRFs on Brightness Temperature (TB) simulation were analyzed. Compared with simulation by ideal SRFs, averaged STandard DeViation (STDV) and bias of Observation minus Background (OMB) by actual SRFs decreases about ‐5.0% and 37.3%. The reductions on equatorial regions are more obvious than middle and high latitudes. Five types of deformations were put forward to analyze their impacts on TB simulation. Attenuation, shifting and extending of passband have more impacts on simulated TB compared with trap on passband. The differences between TBs simulated using ideal and actual SRFs don't depend on the magnitude of the difference between ideal and actual SRFs, but on the balances of different types of deformations of actual SRF.