Abstract:Using satellite data and routine meteorological observation data as well as the second simulation of satellite signal in the solar spectrum,the background figures of atmospheric radiation parameters for (08:00),11:00,14:00,17:00BST of given month,could be constructed,which is composed of the apparent reflectance under the cloudless and dry air condition.Because of the difference in the zenith and azimuth,the hour by hour background figures should be created.Thus some atmospheric parameters of the background figures are possible to be calculated by utilizing the second simulation of satellite signal in the solar spectrum(6S).Applying these parameters to the radiation transfer equation,the atmpspheric optical depth(AOD) at any time is gained.When validating the above idea,four groups of optical depth at 550nm above Beijing meteorological station derived from the GMS5 VISSR visible albedo data are calculated at 08:00,11:00,14:00,17:00BST,respectively.When comparing the values obtained by the retrieval method in this article and from the lidar vertical attenuation data,a good agreement could been seen.After defining a test area,AOD values over dozens of meteorological stations within the area in the periods of 1st to 17th May and 13th July to 14th August 2002 are retrieved using the above means.Then the grid values of the retrieved AOD over the whole retrieval test area are gained using a spatial interpolation method.The results show the retrieved AOD is able to reveal the distribution feature of aerosols.