Evaluation of a ground-based sky camera system for use in surface irradiance measurement

Article

Sabburg, Jeff and Wong, Joe. 1999. "Evaluation of a ground-based sky camera system for use in surface irradiance measurement." Journal of Atmospheric and Oceanic Technology. 16 (6), pp. 752-759. https://doi.org/10.1175/1520-0426(1999)016<0752:EOAGBS>2.0.CO;2
Article Title

Evaluation of a ground-based sky camera system for use in surface irradiance measurement

ERA Journal ID1920
Article CategoryArticle
AuthorsSabburg, Jeff (Author) and Wong, Joe (Author)
Journal TitleJournal of Atmospheric and Oceanic Technology
Journal Citation16 (6), pp. 752-759
Number of Pages8
Year1999
Place of PublicationBoston, MA. United States
ISSN0739-0572
1520-0426
Digital Object Identifier (DOI)https://doi.org/10.1175/1520-0426(1999)016<0752:EOAGBS>2.0.CO;2
Abstract

This paper describes the evaluation of a ground-based sky camera system for studying the effect of clouds on the level of the ambient ultraviolet radiation. The system has been developed for research in the characterization of the effect of clouds around the sun. It is the first sky camera system to be used for the assessment of cloud conditions in the vicinity of the sun, rather than a whole-sky assessment. The system features a sun-tracking sky camera with an integrated measurement of horizontally received radiation at the same location. The image-processing algorithm uses solar radiation readings to reduce reflections from the sun on the camera system being mistaken for cloud in the images. Cloud amount was estimated in an angular region of between 12.5°and 37.5° around the sun. The algorithm also estimates the amount of solar obstruction by cloud (sun not covered, partially or totally covered). The system was evaluated during September 1997 at Toowoomba, Australia (27.6°S latitude). Compared to manual assessment of 592 images, 76.5% were identified correctly by the algorithm for the degree of solar obstruction and 81.9% for cloud amount. The behavior of ultraviolet radiation levels with cloud conditions is discussed.

Keywordscloud cover; instrumentation; irradiance; ultraviolet radiation
ANZSRC Field of Research 2020400305. Biomedical instrumentation
370106. Atmospheric radiation
370107. Cloud physics
Byline AffiliationsCentre for Astronomy, Solar Radiation and Climate
Queensland University of Technology
Institution of OriginUniversity of Southern Queensland
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