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Estimation of clear‐sky effective erythema radiation from broadband solar radiation (300–3000 nm) data in an arid climate
Author(s) -
Sabziparvar Ali A.
Publication year - 2009
Publication title -
international journal of climatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.58
H-Index - 166
eISSN - 1097-0088
pISSN - 0899-8418
DOI - 10.1002/joc.1848
Subject(s) - pyranometer , environmental science , zenith , solar zenith angle , meteorology , sky , atmospheric sciences , radiation , arid , remote sensing , climatology , geography , physics , optics , paleontology , geology , biology
This study reports the first observations of effective erythema radiation (EER) from an arid region of Iran. The hourly and daily measured clear‐sky global solar radiation ( G ) and biologically important EER incident on a horizontal surface at Esfahan, Iran, during 2002–2004 are used. The EER irradiation was recorded by a spectrophotometer Brewer type MK IV mounted on the roof of the Esfahan site. The total daily broadband radiation was measured using an Eppley Pyranometer (Kipp & Zonen CM) at the same site. Using the mentioned experimental data, a linear relationship (EER = β × G + α) is established between daily integrated totals of EER and the daily totals of broadband global solar radiation (300–3000 nm). At statistically significant levels ( p < 0.05 and R 2 > 0.92) a good linear correlation between the daily G and EER was found. The observed ( G ) data is a routine meteorological measurement at many meteorological stations and such a relationship would enable estimates of the daily EER to be made from accessible records. The seasonal variability of EER/ G is also discussed. The effect of the annual cycles of solar zenith angle (SZA) and total column ozone (TCO) on the ratios (EER/ G ) is presented and the correction factors are determined for the inclusion of the ozone cycle. Copyright © 2009 Royal Meteorological Society