Observational study of aerosol optical depth over Pearl River Delta
珠江三角洲气溶胶光学厚度的观测研究

Multi-wavelength sun-photometers were used to retrieve data on the aerosol optical depth(AOD)over the Pearl River Delta(PRD)from January 2004 to June 2007.A method for calibrating the instruments is described and the AOD results are analyzed.The MODIS AOD products from NASA are compared against retrieved AOD from the sun-photometers.The results reveal that the data filtered by the iterative method is more reasonable for the Langley plot than that from other approaches.Some statistical results are as follows...