Five years of cloud enhanced surface UV radiation measurements at two sites (in the Northern and Southern Hemispheres)

Article


Sabburg, J. and Calbo, J.. 2009. "Five years of cloud enhanced surface UV radiation measurements at two sites (in the Northern and Southern Hemispheres)." Atmospheric Research. 93 (4), pp. 902-912. https://doi.org/10.1016/j.atmosres.2009.05.003
Article Title

Five years of cloud enhanced surface UV radiation measurements at two sites (in the Northern and Southern Hemispheres)

ERA Journal ID1956
Article CategoryArticle
AuthorsSabburg, J. (Author) and Calbo, J. (Author)
Journal TitleAtmospheric Research
Journal Citation93 (4), pp. 902-912
Number of Pages11
Year2009
PublisherElsevier
Place of PublicationAmsterdam, Netherlands
ISSN0169-8095
1873-2895
Digital Object Identifier (DOI)https://doi.org/10.1016/j.atmosres.2009.05.003
Abstract

This is the first paper to report a detailed comparison between ground based measurements of cloud enhanced ultraviolet (UV) radiation at sites located in both hemispheres. The measurements were undertaken at a Northern Hemisphere site (at the campus of the University of Girona in Spain) and a Southern Hemisphere site (campus of the University of Southern Queensland, Toowoomba, Australia). These sites were chosen as they have both simultaneous sky camera and solar radiation (including UV) measurement campaigns operating for at least 5 years over the same time period. Although hemispheric comparisons of UV radiation are not new, this paper focuses on a study of enhancements, including a comparison of the frequency of occurrence and associated cloud types, at the locations with differing climatology. It is found that although there are commonalities between the sites, such as the correlation of the frequency of enhancements with larger solar zenith angle (SZA) both at Girona and Toowoomba, there are differences too, e.g. the frequency of occurrence of the
enhancements, and the type of clouds that produce most enhancements (cirrus at Girona, cumulus at Toowoomba). It is suggested that this is due to the differences in latitude coupled with a large amount of Cirriform cloud, especially corresponding to large SZA, at Girona. Possible explanations for this major difference were examined, with the most likely hypothesis relating to multiple scattering due to Cirriform cloud and the subsequent effect on UV radiation on a horizontal surface at large SZA.

Keywordsenhanced; clouds; ultraviolet radiation; sky camera
ANZSRC Field of Research 2020519999. Other physical sciences not elsewhere classified
370106. Atmospheric radiation
370107. Cloud physics
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Byline AffiliationsAustralian Centre for Sustainable Catchments
University of Girona, Spain
Institution of OriginUniversity of Southern Queensland
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