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Ann. Geophys., 23, 3399-3406, 2005
www.ann-geophys.net/23/3399/2005/
© European Geosciences Union 2005
Comparative measurements of total ozone amount and aerosol optical depth during a campaign at El Arenosillo, Huelva, Spain
A. de La Casinière1, V. Cachorro2, I. Smolskaia3, J. Lenoble1,4, M. Sorribas5, M. Houët4, O. Massot6, M. Antón7, and J. M. Vilaplana5
1IRSA, Université Joseph Fourier, Grenoble, France
2GOA, Universidad de Valladolid, Valladolid, Spain
3now at: Institute for Meteorology and Climatology, Hannover University, Hannover, Germany
4LOA, Université des Sciences et Technologies de Lille, Lille, France
5ESAt-El Arenosillo-INTA, Huelva, Spain
6CEMBREU, Briançon, France
7Dept. of Physics, University of Extremadura, Badajoz, Spain
Abstract. A one week field campaign took place in September 2002 at El
Arenosillo, Spain. The objective was to compare total ozone column (TOC) and
aerosol optical depth (AOD) from near ultraviolet to near infrared, measured
by several Spanish and French instruments. Three spectroradiometers, Brewer,
SPUV02, and LICOR, and a CIMEL photometer, have been used simultaneously and
the results are presented for four clear days.
TOC values are given by the Brewer instrument, and by SPUV02, using two
different methods. The ground instruments compare satisfactorily (within
5 DU) and the values are consistent with TOMS data (within 10 DU).
AOD from the various instruments are compared at seven different wavelengths
between 320 nm and 1020 nm: the agreement is very good at 350, 380, and 870 nm;
at the four other wavelengths the difference is smaller than 0.03,
which can be explained by a relative difference of 4% only between the
calibrations of the various instruments.
Larger AOD diurnal variations were observed at short wavelengths than in the
visible and near infrared; this is most likely due to changes in aerosol
size along the day, during the campaign.
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