Abstract
A method is developed to retrieve total Cloud Optical Depth (COD) from broadband Global Solar Radiation detected by paronometer, and available approaches to input aerosol/molecular/gas parameters for the COD retrieval are presented. Aerosol Optical Depth (AOD) retrieved from pyrheliometer data and simultaneous visibility measurement in the clear days are used in building an empirical relationship between AOD and visibility. The relationship is used in determining AOD in the cloudy days. By using the method, the retrieved CODs over 11 meteorological observatories in China during 2001 are compared with MODIS COD products. The difference between the yearly-mean CODs from hourly-accumulated paronometer data and the MODIS COD is less than 34.5% for every site. The agreement between yearly-mean COD from daily GSR data and MODIS COD is also good for all 11 sites except for Geermu site locating over Qinghai-Tibet Plateau. Furthermore, CODs over Beijing and Zhengzhou during 1961-2001 are analyzed.
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