Articles | Volume 8, issue 22
Atmos. Chem. Phys., 8, 6597–6602, 2008
https://doi.org/10.5194/acp-8-6597-2008

Special issue: One century of solar ultraviolet research

Atmos. Chem. Phys., 8, 6597–6602, 2008
https://doi.org/10.5194/acp-8-6597-2008

  17 Nov 2008

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 J. Lenoble et al.
  • 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.

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