The effect of clouds on enhancing UVB irradiance at the earth's surface: a one year study

Article

Sabburg, J. and Wong, J.. 2000. "The effect of clouds on enhancing UVB irradiance at the earth's surface: a one year study." Geophysical Research Letters. 27 (20), pp. 3337-3340. https://doi.org/10.1029/2000GL011683
Article Title

The effect of clouds on enhancing UVB irradiance at the earth's surface: a one year study

ERA Journal ID1874
Article CategoryArticle
AuthorsSabburg, J. (Author) and Wong, J. (Author)
Journal TitleGeophysical Research Letters
Journal Citation27 (20), pp. 3337-3340
Number of Pages4
Year2000
PublisherJohn Wiley & Sons
Place of PublicationHoboken, NJ. United States
ISSN0094-8276
1944-8007
Digital Object Identifier (DOI)https://doi.org/10.1029/2000GL011683
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1029/2000GL011683/pdf
Abstract

The most extensive study of frequency, magnitude and sky properties associated with UVB enhancement is reported. The first integrated automatic sky camera and irradiance measurement system was used for simultaneous data collection over the solar zenith angle range of 4.2 to 64.3°. It is reported that 3% of UVB irradiance measurements collected at intervals of 6 minutes, over a one-year period, were cloud enhanced. It was found that 85% of possible UVB enhancements occurred for solar zenith angles ranging from 40 to 63°. The study was undertaken during September 1997 to August 1998 at Toowoomba, Australia (27.6°S, 151.9°E). The maximum UVB enhancement was found to have an irradiance of 8% greater than that of an equivalent clear-sky. A mechanism for UVB enhancement for cases of solar obstruction by cirrus cloud is postulated. Analysis showed that 86% of enhancement occurred under hazy/cirrus skies.

Keywordsclouds; solar radiation; ultraviolet radiation
ANZSRC Field of Research 2020370107. Cloud physics
370106. Atmospheric radiation
511099. Synchrotrons and accelerators not elsewhere classified
Byline AffiliationsCentre for Astronomy, Solar Radiation and Climate
Queensland University of Technology
Institution of OriginUniversity of Southern Queensland
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