1Royal Meteorological Institute of Belgium, Department of Observations, Avenue Circulaire 3, 1180 Brussels, Belgium
2Hong Kong Polytechnic Univ., Department of Civil and Structural Engineering, Hong Kong
3Yonsei Univ., Rm. 545, Global Environment Laboratory, Department of Atmospheric Science, College of Science, 134 Sinchon-dong, Seodaemoon-gu, Seoul 120-745, Republic of Korea
4Environment Canada, 4905 Dufferin Street, Toronto Ontario, M3H 5TH4, Canada
5Department of Physics, Univ. of Rome "La Sapienza", P. le Aldo Moro, 200185, Roma, Italy
Abstract. The Langley plot method applied on the Brewer Ozone measurements can provide accurate Aerosol Optical Depth (AOD) in the UV-B. We present seven intercomparisons between AOD retrieved from Brewer Ozone measurements and AOD measured by CIMEL sunphotometer, which are stored in the international AERONET database. Only the intercomparisons between co-located instruments can be used to validate the Langley Plot method applied to the Brewer measurements: in this case, all the correlation coefficient are above 0.83. If the instruments are not at the same site, the correlation between the AOD retrieved by both instruments is much lower.