| Summary: | Temporal variability in erythemal UV irradiance was analyzed using the data of ERA-INTERIM reanalysis, TOMS/OMI satellite measurements, and INM-RSHU chemistry-climate model (CCM) over Northern Eurasia during the 1979-2015 period. In the analysis we also used long-term ground-based UV measurements over the 1968-2022 period at the Meteorological Observatory of Moscow State University (Chubarova, Nezval, 2000) using the modern instrumentation within BRSN-like station during the last years. The analysis revealed up to +6-9% per decade increase during summer over Eastern Europe, Siberia and Far East, however, over Arctic region negative changes were observed. We showed that these significant variations were connected with total ozone and effective cloud amount changes according to the results of the reconstruction model technique (Chubarova et al., 2020). In addition, negative trends in aerosol optical thickness over several regions in Europe (Volpert, Chubarova, 2021) were important for UV growth. During the last years since 2018 we obtained slowdown of the positive UV trend over Eastern Europe. Model experiments have revealed the largest impact of anthropogenic emissions of ozone-depleting substances and some effects of volcanic aerosol and of SST on ozone content and, hence, on UV irradiance trends. In addition, we discussed the changes of UV resources during this period over Northern Eurasia, which were characterized by a noticeable reduction of the UV optimum area for 1 and 2 skin types. The research was fulfilled at the Lomonosov Moscow State University under Scientific and Educational School “Future Planet and Global Environmental Change”and partially supported by the grant #075-15-2021-574.
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