Cloud spectral transmittance in the UV and visible at Ushuaia (54 degrees 49 minutes S, 68 degrees 19 minutes W)

Susana B. Diaz; Paula Vigliarolo; Carolina Vera; Guillermo Deferrari

doi:10.1117/12.452946

17 January 2002 Cloud spectral transmittance in the UV and visible at Ushuaia (54 degrees 49 minutes S, 68 degrees 19 minutes W)

Susana B. Diaz, Paula Vigliarolo, Carolina Vera, Guillermo Deferrari

Author Affiliations +

Proceedings Volume 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects; (2002) https://doi.org/10.1117/12.452946
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The presence of clouds is responsible for an important variation in the UV and visible radiation at the Earth's surface. Although for practical purposes cloud transmittance is often considered plane in the UV and visible, a wavelength dependence is observed. In this paper we performed a statistical study of cloud transmittance at Ushuaia for wavelengths between 295 and 600 nm, following different procedures. A decrease of the transmittance for increasing wavelengths in the UVA and the visible was observed (0 to 50% decrease at 600 nm regarding to 340 nm) in good agreement with the observations made by other authors. Nevertheless, for wavelengths below 320 nm our results show discrepancy with other papers. Since Ushuaia is a small town n a fairly unpolluted area, a possible reason for this differences is that, as a consequence of low ozone amounts in the troposphere, Rayleigh scatter is more important than ozone absorption, even in this part of the spectrum.

Citation Download Citation

Susana B. Diaz, Paula Vigliarolo, Carolina Vera, and Guillermo Deferrari "Cloud spectral transmittance in the UV and visible at Ushuaia (54 degrees 49 minutes S, 68 degrees 19 minutes W)", Proc. SPIE 4482, Ultraviolet Ground- and Space-based Measurements, Models, and Effects, (17 January 2002); https://doi.org/10.1117/12.452946

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KEYWORDS

Clouds

Transmittance

Ozone

Ultraviolet radiation

Visible radiation

Signal to noise ratio

Signal attenuation

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