Abstract
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.
Highlights
The density of the aerosol particles is a key parameter in the radiative budget of the atmosphere
We present seven intercomparisons between Aerosol Optical Depth (AOD) retrieved from Brewer Ozone measurements at 320 nm and AOD measured by CIMEL sunphotometer at 340 nm or 440 nm, which are stored in the international AERONET database
The validation of the AOD obtained in using Langley Plot Method (LPM) will be made in section 3 in comparing AOD from Brewer spectrophotometers and the CIMEL sunphotometers belonging to the AERONET database at seven different stations
Summary
The retrieval of AOD from these instruments using the Langley Plot Method (LPM) represents complementary information to the AOD in the visible spectrum obtained with other instruments (de La Casiniere et al, 2005). Even if such information is limited, this approach is still useful since it potentially makes possible to determine AOD for about 200 instruments: some of them have 1520 years long records. The validation of the AOD obtained in using LPM will be made in section 3 in comparing AOD from Brewer spectrophotometers and the CIMEL sunphotometers belonging to the AERONET database (http://aeronet.gsfc.nasa.gov/) at seven different stations
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