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Discussion papers | Copyright
https://doi.org/10.5194/amt-2017-466
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Feb 2018

Research article | 27 Feb 2018

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This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.

Retrieval of health-related UV doses from PAR measurements

Marcelo de Paula Corrêa1, Sophie Godin-Beekmann2, Fabrina Bolzan Martins1, Kátia Mendes1, Martial Haeffelin3, Miguel Rivas4, and Elisa Rojas4 Marcelo de Paula Corrêa et al.
  • 1Instituto de Recursos Naturais, Universidade Federal de Itajubá, Itajubá/MG, Brazil
  • 2LATMOS/OVSQ, Université de Versailles Saint-Quentin-en-Yvelines, Guyancourt, France
  • 3LMD/IPSL – Ecole Polytechnique, Palaiseau, France
  • 4Laboratório de Radiación Solar Ultravioleta, Facultad de Ciências, Universidad de Tarapacá, Arica, Chile

Abstract. The ultraviolet index (UVI) is an important tool to raise public awareness of the risks of solar radiation overexposure. However, solar ultraviolet radiation instruments are relatively expensive, and the deployment and maintenance of a large-scale network proved impractical. In this paper, we describe a simple method for UVI and daily erythemal dose retrieval from photosynthetically active radiation (PAR – 0.40–0.70μm) measurements. These latter are generally performed by cheaper instruments and commonly found in any ordinary meteorological station. Despite the different interactions involving UV and PAR radiation with the atmospheric components, our method is based on the solar position and cloud modification factor (CMF) that exert a quite similar influence on these electromagnetic radiation bands. We also show that this method is not suitable for shortwave radiation sensors (0.25–4.00μm). A large dataset was used to test this method and the comparisons between UVI measurements and inferences are comparable to the instrumental errors. Thus, in this paper we show a 2nd degree regression equation for obtaining erythemal UV from PAR measurements.

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Marcelo de Paula Corrêa et al.
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Latest update: 17 Sep 2018
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Short summary
This paper provides a very simple method for UV index estimation from PAR measurements. These latter are generally performed by cheaper instruments and commonly found in any ordinary meteorological station. A large dataset collected in South America and Europe was used to test this method and thes results are comparable to the instrumental errors. For this reason, the method is a useful tool for UV index evaluations in regions lacking adequate instrumentation.
This paper provides a very simple method for UV index estimation from PAR measurements. These...
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