Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-161-2008
http://www.atmos-chem-phys-discuss.net/8/161/2008/
http://www.atmos-chem-phys-discuss.net/8/161/2008/acpd-8-161-2008.html
http://www.atmos-chem-phys-discuss.net/8/161/2008/acpd-8-161-2008.pdf
161
179
2008-01-08
Measurements of UV Aerosol Optical Depth in the French Southern Alps
J. Lenoble
jacqueline.lenoble@wanadoo.fr
C. Brogniez
A. de La Casinière
T. Cabot
V. Buchard
F. Guirado
Laboratoire d'Optique Atmosphérique (LOA), Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France
Interactions Rayonnement Solaire Atmosphère (IRSA), Université Joseph Fourier de Grenoble, 17 Quai Claude Bernard, 38000 Grenoble, France
Centre Européen Médical et Bioclimatologique de Recherche et d'Enseignement Supérieur (CEMBREU), 35, rue Croix de Bretagne, Villars St Pancrace, 05100 Briançon, France
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.
<br><br>
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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