Improved ground based sky camera for studies of enhanced spectral UV irradiance

Paper

Sabburg, J. and Long, C. N.. 2004. "Improved ground based sky camera for studies of enhanced spectral UV irradiance." EGU 1: 1st European GeoSciences Union Genral Assembly. Nice, France 25 - 30 Apr 2004 Germany.

Paper/Presentation Title	Improved ground based sky camera for studies of enhanced spectral UV irradiance
Presentation Type	Paper
Authors	Sabburg, J. (Author) and Long, C. N. (Author)
Journal or Proceedings Title	Geophysical Research Abstracts
Journal Citation	6 (00544), pp. 1-1
Number of Pages	1
Year	2004
Place of Publication	Germany
Web Address (URL) of Paper	http://www.cosis.net/abstracts/EGU04/00544/EGU04-J-00544.pdf
Conference/Event	EGU 1: 1st European GeoSciences Union Genral Assembly
Event Details	EGU 1: 1st European GeoSciences Union Genral Assembly Event Date 25 to end of 30 Apr 2004 Event Location Nice, France
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 UV irradiance, and UV actinic flux, using automated CCD and sky cameras. This paper describes image-processing improvements and new algorithms applicable to a commercially available, relatively low cost all-sky camera (TSI-440), we use for investigating cloud enhanced spectral UV irradiance. Specifically, these include improved shadow band masking, and the addition of three new algorithms relating to cloud amount at different spatial positions and the visible brightness of clouds surrounding the sun. We also present a summary of 5-minute resolution cloud enhanced UV index and spectral UV irradiance over a 5-month period at a Southern Hemispheric sub-tropical latitude site using these new techniques, as well as how these findings relate to the current literature on this topic.
Keywords	UV exposure; clouds; all-sky imagery
ANZSRC Field of Research 2020	519999. Other physical sciences not elsewhere classified
	370106. Atmospheric radiation
	370107. Cloud physics
Public Notes	Only abstract published.
Byline Affiliations	Centre for Astronomy, Solar Radiation and Climate
	Pacific Northwest National Laboratory, United States
Institution of Origin	University of Southern Queensland

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