An algorithm was used to retrieve the cloud top pressure (CTP) of opaque clouds from the imagery of the geo-stationary satellite FY-2C,and the IR Window (IRW) technique was applied to determine the pixel CTP of the opaque clouds together with NCEP atmospheric profiles.The results were compared with the MODIS/MOD06 CTP products and the CloudSat/CPR CTP estimated from radar reflectivity as a nearest neighbor path along the CloudSat ground track.The results show that the IRW technique works reliably with opaque clouds and IRW brightness temperatures can be compared to temperature profiles to infer the level of best agreement that is taken to be the level of the cloud.The comparisons demonstrate close agreement between FY-2C,MODIS and CPR at the optically thick clouds,especially for the deep convective clouds and the multi-layered clouds where the emissivity is approximately equal to 1.0 as blackbody.The differences in FY-2C,MODIS and CPR retrievals lie in the regions with transmissive clouds above lower opaque clouds where the CTP results from IRW technique demonstrate the pressure of the "radiative center" of the clouds,rather than the true cloud top pressure.
applied meteorologycloud top pressureIR Window techniqueopaque cloudsgeo-stationary satellite FY-2C
国家科技期刊平台
NSTL
维普
万方数据
