利用风云2C静止卫星反演气溶胶光学厚度

We deeply discuss how to use the measurement from the visible channel of Chinese Fengyun-2C (FY2C) geostationary satellite to retrieve the aerosol optical depth (AOD). By means of calculating the mean surface reflectance at the same local time of each day in one month, the randomicity of the estimated surface reflectance can be reduced. We concentrate on this method, and how different values of AOD assumed in the cleanest days influence the quality of final AOD product. Also, we use the data in May 2008 to test our algorithm and compare the results with the AOD product from seven AERONET sites in East Asian and MODIS AOD product respectively. Last, we analyze the error sources in our retrieval of AOD from FY2C satellite, and relate the corresponding possible schemes to decrease the error influence and improve the quality of FY2C AOD product. The consequence of comparison indicates that in East Asian our AOD product can display the pattern of aerosol distribution, but overestimates the values of AOD in southwest of China and low latitude areas, and underestimates the values of AOD in east of China.