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Proceedings Paper

Assessment of TOMS UV bias due to absorbing aerosols
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Paper Abstract

TOMS UV algorithm is capable of taking into account the scattering aerosols via its scene reflectivity. It also accounts for absorbing aerosols in free troposphere (dust and smoke plumes) via aerosol index correction. On the other hand, the effects of aerosol absorption in the boundary layer are not properly taken into account, because they do not appear as absorbing aerosols in the TOMS AI data (positive AI). This additional error has been claimed to be the reason for the observed positive bias between TOMS derived UV and ground-based measurements. We compared TOMS overpass irradiances against the Brewer measurements in NASA/GSFC site in USA and Thessaloniki, Greece with the main objective of evaluating the effect of absorbing aerosols with the measurements of aerosol optical properties. We found that the bias between TOMS UV and ground-based data depends on the aerosol absorption. In other words, the bias was increasing with the increasing aerosol absorption, τabs. A simple correction to account for this effect is proposed, assuming that the climatology of τabs is known.

Paper Details

Date Published: 14 October 2004
PDF: 8 pages
Proc. SPIE 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV, (14 October 2004); doi: 10.1117/12.558691
Show Author Affiliations
Antti Arola, Finnish Meteorological Institute (Finland)
Stelios Kazadzis, Aristotle Univ. of Thessaloniki (Greece)
Nickolay A. Krotkov, NASA Goddard Space Flight Ctr. (United States)
Alkis Bais, Aristotle Univ. of Thessaloniki (Greece)
Jay R. Herman, NASA Goddard Space Flight Ctr. (United States)
Kaisa Lakkala, Finnish Meteorological Institute (Finland)

Published in SPIE Proceedings Vol. 5545:
Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV
James R. Slusser; Jay R. Herman; Wei Gao; Germar Bernhard, Editor(s)

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