Reducing cloud contamination in aerosol optical depth (AOD) measurements

Abstract. We propose a new cloud screening method for sun photometry that is designed to effectively filter thin clouds. Our based on k-nearest-neighbour algorithm instead of scanning time series aerosol optical depth. Using 10 years data from precision radiometer in Innsbruck, we compare our and the currently employed technique. exemplify performance two routines different conditions. While both algorithms agree classification point as clear or cloudy majority cases, routine found be more effective flagging conclude this simple can serve valid alternative detection, discuss generalizability other observation sites.