Estimation of biologically active erythemal UV radiation and UV resources in the Crimea
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Abstract
The temporal changes of biologically active erythemal UV radiation (Qery) and its determining factors were analyzed at the territory of the State Nature Reserve «Karadagsky» (KNS — PZ RAS — Branch of IBSS) in the Crimea for the period of 2018–2019. The daily sum of Qery varied more than 10 times, from 67.6 Jm-2 to 5856 Jm-2, and generally corresponded to the seasonal course of the solar elevation, but due to optically thick clouds, Qery could decrease by more than 5 times, affecting its biological impact. Based on Qery measurement data, UV resources are estimated for different months of the year. It was found that during the cold period (November — January), when the degree of openness of the human skin is S = 0,1 and solar elevation is low, the conditions of UV deficiency are observed, when it is impossible to form vitamin D for the second type of skin. The most favorable conditions for heliotherapy at these S are observed in March and October for the second skin type, and for the fourth skin type — in April and September. With an increase in the proportion of body openness due to the hands, face and neck (S = 0,3), the formation of vitamin D is possible throughout the year for the second type of skin. In December and January, the frequency of such conditions is 10–30 %. During warm period in the Crimea in the morning or evening hours, the UV conditions favorable for vitamin D generation are almost always observed. In summer, for the fourth type of skin, conditions of UV optimum or UV excess of the first degree are detected.
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References
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