Improved sky imaging for studies of enhanced UV irradiance

Article

Sabburg, J. M. and Long, C. N.. 2004. "Improved sky imaging for studies of enhanced UV irradiance." Atmospheric Chemistry and Physics. 4 (11-12), pp. 2543-2552.

Article Title	Improved sky imaging for studies of enhanced UV irradiance
ERA Journal ID	1954
Article Category	Article
Authors	Sabburg, J. M. (Author) and Long, C. N. (Author)
Journal Title	Atmospheric Chemistry and Physics
Journal Citation	4 (11-12), pp. 2543-2552
Number of Pages	10
Year	2004
Place of Publication	Goettingen, Germany
ISSN	1680-7316
	1680-7324
Web Address (URL)	http://www.atmos-chem-phys.net/4/2543/2004/acp-4-2543-2004.pdf
Abstract	A recent World Meteorological Organisation report discussed the importance of continued study of the effect of clouds on the solar UV radiation reaching the earths surface. The report mentions that the use of all-sky imagery offers the potential to understand and quantify cloud effects more accurately. There are an increasing number of studies investigating the enhancement of surface solar, UV irradiance, and UV actinic flux, using automated CCD and sky imagers. This paper describes new algorithms applicable to a commercially available all-sky imager (TSI-440), for research investigating cloud enhanced spectral UV irradiance. Specifically, these include three new algorithms relating to cloud amount at different spatial positions from 1) zenith and 2) from the solar position and 3) the visible brightness of clouds surrounding the sun. A possible relationship between UV enhancement and the occurrence of near-sun cloud brightness is reported based on this preliminary data. It is found that a range of wavelength dependent intensities, from 306 to 400 nm, can occur in one day for UV enhancements. Evidence for a possible decreasing variation of intensity with longer wavelengths is also presented.
Keywords	UV enhancement; imager
ANZSRC Field of Research 2020	519999. Other physical sciences not elsewhere classified
	370107. Cloud physics
	370106. Atmospheric radiation
Byline Affiliations	Centre for Astronomy, Solar Radiation and Climate
	Pacific Northwest National Laboratory, United States

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