Systematic differences of two similar approaches to the determination of the AOD from Brewer direct sun UV measurements

J.L. Gómez-Amo, A. Di Sarra, M. Stanek, M.P. Utrillas, J.A. Martínez-Lozano

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Abstract

The determination of the aerosol optical depth (AOD) in the ultraviolet spectral region has become interesting due to the important role that the particles play in the Earth climate and its relation to the photochemical effects. The aim of this work is to determine the systematic differences of two similar approaches which use the same methodology to retrieve AOD from Brewer direct sun measurements. Those proposed by Sellitto et al. (2006), and by Stanek (http://www.o3soft.eu/o3baod.html). The tests have been performed using one-year Brewer measurements at Lampedusa Station. The Stanek AOD values are smaller than those provided by Sellitto et al, showing absolute differences between them from 0.02 to 0.7. No dependence on wavelength and the increase with AOD was observed. Linear regression between both approaches has very good agreement for all the wavelengths (R > 0.997). We have reprocessed the Stanek values using the linear regression coefficients yielding absolute deviations less than 0.04 which falls inside of the error assigned to the AOD. Copyright © 2010 AIDIC servizi S.r.l.
Original languageEnglish
Pages (from-to)65 - 70
Number of pages6
JournalChemical Engineering Transactions
Volume22
DOIs
Publication statusPublished - 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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