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Solar UV dose patterns in Italy.

D Meloni¹, G R Casale, A M Siani

¹Department of Physics, University of Rome La Sapienza, Italy.

Photochemistry and Photobiology

|June 17, 2000

Summary

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Solar UV spectral irradiance measurements in Italy from 1992 show reasonable agreement with atmospheric models. This study maps solar UV patterns across Italy, aiding epidemiology and biosphere impact research.

Area of Science:

Atmospheric science
Radiative transfer
Spectrophotometry

Background:

Solar ultraviolet (UV) spectral irradiance (290-325 nm) measurements are crucial for understanding UV impacts.
Long-term UV data collection is essential for environmental and health studies.

Purpose of the Study:

To compare ground-based solar UV spectral irradiance measurements with a radiative transfer model.
To create a comprehensive map of solar UV geographic patterns in Italy.
To provide data for epidemiological and biosphere impact studies.

Main Methods:

Utilized Brewer spectrophotometry for solar UV spectral irradiance measurements at Rome and Ispra since 1992.
Employed the System for Transfer of Atmospheric Radiation (STAR) model, incorporating multiple scattering, to simulate UV transfer.

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Validated model outputs against measured clear-sky irradiances, considering uncertainties in atmospheric parameters.

Main Results:

Demonstrated reasonable agreement between measured and computed clear-sky UV irradiances.
Developed a detailed map of solar UV geographic patterns across approximately 70 Italian sites.
Introduced a "standard day" concept for each month to represent idealized UV conditions.

Conclusions:

The STAR model effectively simulates UV transfer through the atmosphere.
The generated UV map provides valuable data for skin/eye epidemiology and UV impact research.
Atmospheric and meteorological factors significantly influence ground-level UV radiation.