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Ann. Geophys., 25, 1499-1508, 2007
www.ann-geophys.net/25/1499/2007/
© European Geosciences Union 2007
Adaptation of an empirical model for erythemal ultraviolet irradiance
I. Foyo-Moreno1, I. Alados2, and L. Alados-Arboledas1
1Dpto de Física Aplicada, Universidad de Granada, Granada, Spain
2Dpto de Física Aplicada II, Universidad de Málaga, Málaga, Spain
Abstract. In this work we adapt an empirical model to estimate ultraviolet erythemal
irradiance (UVER) using experimental measurements carried out at seven
stations in Spain during four years (2000–2003). The measurements were taken
in the framework of the Spanish UVB radiometric network operated and
maintained by the Spanish Meteorological Institute. The UVER observations
are recorded as half hour average values. The model is valid for all-sky
conditions, estimating UVER from the ozone columnar content and parameters
usually registered in radiometric networks, such as global broadband
hemispherical transmittance and optical air mass. One data set was used to
develop the model and another independent set was used to validate it. The
model provides satisfactory results, with low mean bias error (MBE) for all
stations. In fact, MBEs are less than 4% and root mean square errors
(RMSE) are below 18% (except for one location). The model has also been
evaluated to estimate the UV index. The percentage of cases with differences
of 0 UVI units is in the range of 61.1% to 72.0%, while the percentage of
cases with differences of ±1 UVI unit covers the range of 95.6% to
99.2%. This result confirms the applicability of the model to estimate
UVER irradiance and the UV index at those locations in the Iberian Peninsula
where there are no UV radiation measurements.
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