ANGEO Annales Geophysicae ANGEO 1432-0576 Copernicus GmbH Göttingen, Germany 10.5194/angeo-28-1441-2010 Influence of turbidity and clouds on satellite total ozone data over Madrid (Spain) Camacho J. L. 1 Antón M. 2 Loyola D. 3 Hernandez E. 4 Agencia Estatal de Meteorología (AEMET), Madrid, Spain Departamento de Física Aplicada, Universidad de Granada, Granada, Spain Remote Sensing Technology Institute (IMF), German Aerospace Center (DLR), Wessling, Germany Departamento Física de la Tierra II, Universidad Complutense de Madrid, Madrid, Spain 14 07 2010 28 7 1441 1448 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.ann-geophys.net/28/1441/2010/angeo-28-1441-2010.html The full text article is available as a PDF file from http://www.ann-geophys.net/28/1441/2010/angeo-28-1441-2010.pdf

This article focuses on the comparison of the total ozone column data from three satellite instruments; Total Ozone Mapping Spectrometers (TOMS) on board the Earth Probe (EP), Ozone Monitoring Instrument (OMI) on board AURA and Global Ozone Monitoring Experiment (GOME) on board ERS/2, with ground-based measurement recorded by a well calibrated Brewer spectrophotometer located in Madrid during the period 1996–2008. A cluster classification based on solar radiation (global, direct and diffuse), cloudiness and aerosol index allow selecting hazy, cloudy, very cloudy and clear days. Thus, the differences between Brewer and satellite total ozone data for each cluster have been analyzed. The accuracy of EP-TOMS total ozone data is affected by moderate cloudiness, showing a mean absolute bias error (MABE) of 2.0%. In addition, the turbidity also has a significant influence on EP-TOMS total ozone data with a MABE ~1.6%. Those data are in contrast with clear days with MABE ~1.2%. The total ozone data derived from the OMI instrument show clear bias at clear and hazy days with small uncertainties (~0.8%). Finally, the total ozone observations obtained with the GOME instrument show a very smooth dependence with respect to clouds and turbidity, showing a robust retrieval algorithm over these conditions.

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