Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 8, 6597-6602, 2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
17 Nov 2008
Measurements of UV aerosol optical depth in the French Southern Alps
J. Lenoble1,2, C. Brogniez1, A. de La Casinière2, T. Cabot2, V. Buchard1, and F. Guirado3 1Laboratoire d'Optique Atmosphérique (LOA), Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
2Interactions Rayonnement Solaire Atmosphère (IRSA), Université Joseph Fourier de Grenoble, 17 Quai Claude Bernard, 38000 Grenoble, France
3Centre Européen Médical et Bioclimatologique de Recherche et d'Enseignement Supérieur (CEMBREU), 35, rue Croix de Bretagne, Villars St Pancrace, 05100 Briançon, France
Abstract. Routine measurements of global and diffuse UV irradiances at Briançon station (1310 m a.s.l.) are used to retrieve the direct solar irradiance and the aerosol optical depth (AOD), for cloudless days. Data of three years (2003, 2004, 2005) are analyzed; the results confirm those of a preliminary analysis for 2001, 2002.

The atmosphere is very clear in winter, with AODs between 0.05 and 0.1. The turbidity increases slowly in spring, starting end of February, with AODs around 0.2–0.3 in mid summer, some values reaching 0.4. A similar behaviour is observed for all years, with somewhat higher values in late summer for the year 2003.

Citation: Lenoble, J., Brogniez, C., de La Casinière, A., Cabot, T., Buchard, V., and Guirado, F.: Measurements of UV aerosol optical depth in the French Southern Alps, Atmos. Chem. Phys., 8, 6597-6602,, 2008.
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