Evaluation of a sky/cloud formula for estimating UV-B irradiance under cloudy skies

Article

Sabburg, J. and Wong, J.. 2000. "Evaluation of a sky/cloud formula for estimating UV-B irradiance under cloudy skies." Journal of Geophysical Research. 105 (D24), pp. 685-691. https://doi.org/10.1029/2000JD900530
Article Title

Evaluation of a sky/cloud formula for estimating UV-B irradiance under cloudy skies

ERA Journal ID1878
Article CategoryArticle
AuthorsSabburg, J. (Author) and Wong, J. (Author)
Journal TitleJournal of Geophysical Research
Journal Citation105 (D24), pp. 685-691
Number of Pages7
Year2000
Place of PublicationHoboken, NJ. United States
ISSN0148-0227
2156-2202
Digital Object Identifier (DOI)https://doi.org/10.1029/2000JD900530
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1029/2000JD900530/pdf
Abstract

A new sky/cloud formula is evaluated using results collected over 1 year from an integrated sky camera and irradiance measurement system. Sky properties were recorded every 6 min, simultaneously alongside solar radiation measurements at Toowoomba, Australia (27.6° S, 151.9° E), over the solar zenith angle range of 4.2° to 64.3°. This is the first sky formula that incorporates a complement of parameters based on sky properties around the Sun. The sky properties included cloud cover, cloud brokenness, cloud brightness variation, the angle of maximum cloud cover and aureole brightness. The sky formula was developed by correlating the ratio of the measured UV-B irradiance to the modeled clear sky UV-B irradiance for the same atmospheric conditions, with each of the five sky properties listed above. Variation of the UV-B ratio for each individual sky property is examined. This sky formula, used in conjunction with a clear sky semiempirical UV-B model, was compared to three published cloud formulas based on cloud cover alone. Using a data set restricted to cases of cloud obscuring the solar disk, the new formula was found to have the highest r 2 value of 0.82. Further comparison with a fourth published formula using a subset of data containing predominately cirrus cloud type, produced an explained variance of 0.91 between the measured and the modeled data.

ANZSRC Field of Research 2020370106. Atmospheric radiation
370107. Cloud physics
511099. Synchrotrons and accelerators not elsewhere classified
Public Notes

Copyright 2000 by the American Geophysical Union.

Byline AffiliationsCentre for Astronomy, Solar Radiation and Climate
Queensland University of Technology
Institution of OriginUniversity of Southern Queensland
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