Abstract

Direct ultraviolet spectral solar irradiance is regularly obtained by the difference between global and diffuse irradiances at the French Alpine station of Briançon; the data of years 2001 and 2002 are analyzed in this paper. Comparison with modeled values is used for cloud screening, and an average UV-A aerosol optical depth is used as an index of turbidity; it is found to be around 0.05 for the clear winter days and around 0.2 in summer. Langley plots are used to verify the instrument calibration; they confirm the expected uncertainty smaller than 5%. The ozone total column amount is estimated with an uncertainty between -3 and +5 Dobson units; comparisons with TOMS (Total Ozone Mapping Spectrometer) overpass values shows agreement within the expected uncertainties of both instruments.

© 2004 Optical Society of America

Ozone column density determination from direct irradiance measurements in the ultraviolet performed by a four-channel precision filter radiometer

Thomas Ingold, Christian Mätzler, Christoph Wehrli, Alain Heimo, Niklaus Kämpfer, and Rolf Philipona
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Comparison of column ozone retrievals by use of an UV multifilter rotating shadow-band radiometer with those from Brewer and Dobson spectrophotometers

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Direct-Sun column ozone retrieval by the ultraviolet multifilter rotating shadow-band radiometer and comparison with those from Brewer and Dobson spectrophotometers

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Retrieval of the ultraviolet effective snow albedo during 1998 winter campaign in the French Alps

Irina Smolskaia, Dominique Masserot, Jacqueline Lenoble, Colette Brogniez, and Alain de la Casinière
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Absolute spectral measurements of direct solar ultraviolet irradiance with a Brewer spectrophotometer

Alkiviadis F. Bais
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