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Incorporation of aerosol effects in a clear-sky semi-empirical model of UVER radiation for Valencia, Spain
Nunez, M and Marin, MJ and Utrillas, MP and Estelles, V and Martinez-Lozano, JA (2010) Incorporation of aerosol effects in a clear-sky semi-empirical model of UVER radiation for Valencia, Spain. International Journal of Climatology (publis). ISSN 0899-8418 (In Press)
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The study develops a simple but physically based model for estimating erythemal irradiance [(UV erythemal radiation (UVER)] for cloudless urban regions with substantial aerosol load, such as that of the Valencia environment in Spain. The model estimates direct and diffuse UVER for cloudless aerosol-free conditions using the LibRadtran model with a DISORT algorithm. Aerosol optical thickness for UVER (τaER) is obtained as a residual term by comparing measured direct UVER against modelled direct UVER in the absence of aerosol load. On average, τaER is 18% higher than τ data extrapolated to 305 nm using the CIMEL CE-318. Comparison of measured direct and diffuse UVER with model estimates provide the single scattering albedo (ωER), which on average is 0.88 for Burjassot, Valencia. When tested against independent data, hourly root mean square (RMS) errors are 6.2% if both aerosol properties are known independently. The error is 7.6% when monthly averages of these aerosol properties are used to estimate hourly erythemal irradiance in other years. However, errors are larger, at 18.0%, when monthly estimates of these aerosol properties are used at other experimental sites in the region with no aerosol data.
|Keywords:||semi-empirical model; UVER; aerosol optical thickness (τ ); single scattering albedo (ω)|
|Journal or Publication Title:||International Journal of Climatology|
|Identification Number - DOI:||10.1002/joc.2133|
|Additional Information:||The definitive published version is available online at: http://onlinelibrary.wiley.com/|
|Date Deposited:||12 Oct 2010 04:34|
|Last Modified:||18 Nov 2014 04:13|
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