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A new method for estimating UV fluxes at ground level in cloud-free conditions

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Date
2017
Author
Nyamsi William Wandji
Pitkänen Mikko RA
Aoun Youva
Blanc Philippe
Heikkilä Anu
Lakkala Kaisa
Bernhard Germar
Koskela Tapani
Lindfors Anders V
Arola Antti
Wald Lucien
Unique identifier
10.5194/amt-10-4965-2017
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Citation
Nyamsi William Wandji. Pitkänen Mikko RA. Aoun Youva. Blanc Philippe. Heikkilä Anu. Lakkala Kaisa. Bernhard Germar. Koskela Tapani. Lindfors Anders V. Arola Antti. Wald Lucien. (2017). A new method for estimating UV fluxes at ground level in cloud-free conditions.  Atmospheric Measurement Techniques, 10 (12) , 4965-4978. 10.5194/amt-10-4965-2017.
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CC BY http://creativecommons.org/licenses/by/4.0/
Abstract

A new method has been developed to estimate the global and direct solar irradiance in the UV-A and UV-B at ground level in cloud-free conditions. It is based on a resampling technique applied to the results of the k-distribution method and the correlated-k approximation of Kato et al. (1999) over the UV band. Its inputs are the aerosol properties and total column ozone that are produced by the Copernicus Atmosphere Monitoring Service (CAMS). The estimates from this new method have been compared to instantaneous measurements of global UV irradiances made in cloud-free conditions at five stations at high latitudes in various climates. For the UV-A irradiance, the bias ranges between −0.8 W m−2 (−3 % of the mean of all data) and −0.2 W m−2 (−1 %). The root mean square error (RMSE) ranges from 1.1 W m−2 (6 %) to 1.9 W m−2 (9 %). The coefficient of determination R2 is greater than 0.98. The bias for UV-B is between −0.04 W m−2 (−4 %) and 0.08 W m−2 (+13 %) and the RMSE is 0.1 W m−2 (between 12 and 18 %). R2 ranges between 0.97 and 0.99. This work demonstrates the quality of the proposed method combined with the CAMS products. Improvements, especially in the modeling of the reflectivity of the Earth's surface in the UV region, are necessary prior to its inclusion into an operational tool.

URI
https://erepo.uef.fi/handle/123456789/5994
Link to the original item
http://dx.doi.org/10.5194/amt-10-4965-2017
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Copernicus Publications on behalf of the European Geosciences Union
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  • Luonnontieteiden ja metsätieteiden tiedekunta
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