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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, Incorporation of aerosol effects in a clear-sky semi-empirical model of UVER radiation for Valencia, Spain, International Journal of Climatology, 31, (6) pp. 937-948. ISSN 0899-8418 (2011) [Refereed Article]

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Copyright 2010 Royal Meteorological Society

DOI: doi:10.1002/joc.2133


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.

Item Details

Item Type:Refereed Article
Keywords:semi-empirical model; UVER; aerosol optical thickness (τ ); single scattering albedo (
Research Division:Environmental Sciences
Research Group:Pollution and contamination
Research Field:Pollution and contamination not elsewhere classified
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Air quality, atmosphere and weather not elsewhere classified
UTAS Author:Nunez, M (Dr Manuel Nunez)
ID Code:65181
Year Published:2011
Web of Science® Times Cited:4
Deposited By:Geography and Environmental Studies
Deposited On:2010-10-11
Last Modified:2015-02-08

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