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Proceedings Paper

Validation of TOMS UV irradiance with Brewer ground-based measurements at southwestern Spain
Author(s): Manuel Antón; Victoria E. Cachorro; José M. Vilaplana; Nikolay Krotkov; Antonio Serrano; Carlos Toledano; Benito de la Morena; Jay R. Herman; María L. Cancillo
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Paper Abstract

Long-term ground-based UV radiometers and satellite UV spectrometers have been utilized for detecting trends in UV radiation and for establishing its climatology. The aim of this work is to compare noon erythemal (CIE) UV irradiance data from NASA Total Ozone Mapping Spectrometer (TOMS) with ground-based measurements from a Brewer spectrophotometer. The Brewer instrument is located at the Atmospheric Sounding Station "El Arenosillo" (ESAt) in Huelva, Southwestern Spain. ESAt, with a high number of cloud-free days per year, is particularly suitable for atmospheric-radiation studies and satellite validation. The period of study covers the years 2000 to 2004. The effect of clouds and aerosols on the satellite vs ground-based bias is evaluated under different atmospheric conditions regarding aerosol load and cloudiness. It is found that under all sky conditions TOMS overestimates the noon CIE irradiance about 8%. This bias is even higher (about 12%) for cloud-free days, showing statistically significant correlation with the aerosol optical depth at 440 nm as measured by a co-located CIMEL-AERONET sunphotometer. However, for thick clouds (high TOMS reflectivity) the bias becomes negative. Regarding aerosols, the bias increases as the aerosol load increases, showing the highest values during dust events. All these facts suggest the need to correct the TOMS UV products mainly under dust conditions.

Paper Details

Date Published: 12 October 2006
PDF: 10 pages
Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63622D (12 October 2006); doi: 10.1117/12.689921
Show Author Affiliations
Manuel Antón, Univ. de Extremadura (Spain)
Victoria E. Cachorro, Univ. de Valladolid (Spain)
José M. Vilaplana, INTA, Estación de Sondeos Atmosféricos El Arenosillo (Spain)
Nikolay Krotkov, Univ. of Maryland, Baltimore County (United States)
Antonio Serrano, Univ. de Extremadura (Spain)
Carlos Toledano, Univ. de Valladolid (Spain)
Benito de la Morena, INTA, Estación de Sondeos Atmosféricos, El Arenosillo (Spain)
Jay R. Herman, NASA Goddard Space Flight Ctr. (United States)
María L. Cancillo, Univ. de Extremadura (Spain)

Published in SPIE Proceedings Vol. 6362:
Remote Sensing of Clouds and the Atmosphere XI
James R. Slusser; Klaus Schäfer; Adolfo Comerón, Editor(s)

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