Intercomparison of aerosol optical depth from brewer ozone spectrophotometers and CIMEL sunphotometers measurements

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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 Angstr̈om'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 Angstr̈om's law the intercomparison is improved compared to previous study.

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Cheymol, A., Sotelino, L. G., Lam, K. S., Kim, J., Fioletov, V., Siani, A. M., & Backer, H. D. (2009). Intercomparison of aerosol optical depth from brewer ozone spectrophotometers and CIMEL sunphotometers measurements. Atmospheric Chemistry and Physics, 9(2), 733–741. https://doi.org/10.5194/acp-9-733-2009

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