Clear Sky Fitting of Multifilter Rotating Shadowband Radiometer Data for Aerosol Optical Depth Determinations

Abstract

The retrieval algorithm of atmospheric column Aerosol Optical depth (AOD) frommulti-filter rotating shadow-band radiometer (MFR 7) data at 870 nm at Sri Samrong districtin Sukhothai province of Thailand is described and validated. In order to provide good datafor clear sky, the empirical fit is investigated for both clear and cloudy days. The comparisonreveals good agreement on retrieval AOD by Langley analysis of data between someidentified clear sky periods and clear sky fitting. Finally a 10-day-period of atmosphericcolumn AOD is determined including the cloudy days with the instrumental calibrationcoefficient of 1.002 ?? 0.005.