Título:
UV Index from Global Solar Irradiance: Performance according to cloudiness and air mass.
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Autor:
Laguarda, Agustín
Abal, Gonzalo
Abal, Gonzalo
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Tipo de documento:
Preprint
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Palabras clave:
Environmental UV radiation
Radiation model
Erythemal solar irradiance
UV index
Radiation model
Erythemal solar irradiance
UV index
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Año de publicación:
2025
Contenido:
Resumen:
Ultraviolet (UV) irradiance from the Sun has potential negative health impacts.
Erythemal UV irradiance (UV-E) is obtained by weighting UV radiation in the
250-400 nm range with the average skin erythemal response function. UV-E is
proportional to the UV Index (UVI), a tool used worldwide to inform the public
about this environmental hazard. Since this magnitude is not currently measured
at most meteorological sites, satellite based estimates are often used to generate
UV-E information over broad areas. However, for a climatological characterization
of variability and typical doses of UV-E, long time series with low biases
are required. An alternative approach is to estimate UV-E from readily available
information with which UV-E is highly correlated. This work builds upon previous
research, which evaluated a simple model (Power Model or PM) to estimate
UV-E from Global Horizontal Irradiance (GHI), relative air mass, and total atmospheric
ozone concentration at the 10-minute level. In that general analysis, the
model showed an uncertainty below 12% (as measured by its relative Root Mean
Squared Deviation or rRMSD) when compared with ground UV-E measurements.
Here, we present a more in-depth assessment of this model, using high-quality
data from four mid-latitude temperate sites. The deviations of the model estimates
from UVI ground measurements are analyzed under different cloudiness
conditions and across a broad range of air masses. Our results confirm that PM
performs best under clear skies and low air masses, precisely the conditions associated
to the higher incident solar irradiances and potentially dangerous UV
levels. Under these conditions, the PM has an average accuracy (rRMSD across
sites) of less than 6% of the average of the measurements and outperforms. These
results confirm that the model, particularly in its unbiased version, is a reliable
and practical tool for the climatological analysis of erythemal UV irradiance.
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Citación:
Laguarda, A. y Abal, G. UV Index from Global Solar Irradiance: Performance according to cloudiness and air mass [Preprint] Air Quality, Atmosphere & Health, 2025. ISSN 1873-9326. DOI : https://doi.org/10.1007/s11869-025-01788-3.
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Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| LA25.pdf | Preprint | 1.52 MB | Adobe PDF |