Intercomparison of Aerosol Optical Depth from Brewer Ozone spectrophotometers and CIMEL sunphotometers measurements A. Cheymol1, L. Gonzalez Sotelino1, K. S. Lam2, J. Kim3, V. Fioletov4, A. M. Siani5, and H. De Backer1 1Royal Meteorological Institute of Belgium, Dept. of Observations, Avenue Circulaire 3, 1180 Brussels, Belgium 2Hong Kong Polytechnic University, Dept. of Civil and Structural Engineering, Hong Kong 3Yonsei University, IEAA BK21 Program, Global Environment Laboratory, Department of Atmospheric Science, Seoul, Korea 4Environnement Canada, Experimental Studies Section, Science and Technology Branch, 4905 Dufferin Street, M3H 5T4, Toronto, ON, Canada, 5Department of Physics, University of Rome "La Sapienza", P. le Aldo Moro, 200185 Rome, 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 at 320 nm and AOD measured by
CIMEL sunphotometer at 340 nm or 440 nm (shifted to 320 nm in using the
Angström's law), 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 coefficients are above 0.82. If the instruments are not
at the same site, the correlation between the AOD retrieved by both instruments is much lower.
In applying the Angström's law the intercomparison is improved compared to previous study.
Citation: Cheymol, A., Gonzalez Sotelino, L., Lam, K. S., Kim, J., Fioletov, V., Siani, A. M., and De Backer, H.: Intercomparison of Aerosol Optical Depth from Brewer Ozone spectrophotometers and CIMEL sunphotometers measurements, Atmos. Chem. Phys., 9, 733-741, doi:10.5194/acp-9-733-2009, 2009.