An improved estimation of daily clear-sky biologically EER from broadband global solar radiation |
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Authors: | Ali A Sabziparvar M M Farahani |
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Institution: | (1) College of Agriculture, Bu-Ali Sina University, Hamedan, 65174, I.R. of Iran;(2) Institute of Geophysics, University of Tehran, Kargar Avenue, Tehran, I.R. of Iran |
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Abstract: | To establish a relation between biologically effective erythemal radiation (EER) and global solar radiation, the hourly and
daily clear-sky broadband (310–2,800 nm) global solar radiation (G) and spectral ultraviolet radiation incident on a horizontal
surface at Esfahan, Iran (32°37′N, 51°40′E) were measured during the period 2001–2005. Good correlations at statistically
significant levels between the daily values of EER and the daily G were found. The seasonal variability of EER/G is also discussed
and the correction factors are determined for inclusion of vertical column ozone and solar zenith angle (SZA) cycles. The
comparison of the estimated daily EER against the independent observed EER revealed that under clear sky conditions the estimations
are accurate to 10% or better over SZA of 10–60° and column ozone of 250–350 Dobson. The comparison of the results with the
similar works that have used shorter period of experimental data showed more accurate estimates. The deduced relations could
be used to a rough estimate of the daily EER from G in arid climate regions, where there is no measured UV radiation or there
are instrumental and other difficulties encountered in measuring UV radiation. |
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Keywords: | Daily erythemal radiation Global solar radiation Linear correlation Arid climate Iran |
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