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A one week field campaign took place in September 2002 at El\udArenosillo, Spain. The objective was to compare total ozone column (TOC) and\udaerosol optical depth (AOD) from near ultraviolet to near infrared, measured\udby several Spanish and French instruments. Three spectroradiometers, Brewer,\udSPUV02, and LICOR, and a CIMEL photometer, have been used simultaneously and\udthe results are presented for four clear days.\udTOC values are given by the Brewer instrument, and by SPUV02, using two\uddifferent methods. The ground instruments compare satisfactorily (within\ud5 DU) and the values are consistent with TOMS data (within 10 DU).\ud\ud\udAOD from the various instruments are compared at seven different wavelengths\udbetween 320 nm and 1020 nm: the agreement is very good at 350, 380, and 870 nm;\udat the four other wavelengths the difference is smaller than 0.03,\udwhich can be explained by a relative difference of 4% only between the\udcalibrations of the various instruments.\udLarger AOD diurnal variations were observed at short wavelengths than in the\udvisible and near infrared; this is most likely due to changes in aerosol\udsize along the day, during the campaign

Comparative measurements of total ozone amount and aerosol optical depth during a campaign at El Arenosillo, Huelva, Spain