Variations in the sunlight duration (SLD) in Tomsk are analyzed for the period from 1961 to 2018 and separately for 1961–1990 and 1981–2010. Data on clouds and total solar radiation obtained at the TOR-station of IAO SB RAS in 1996–2018 are used. The actual long-term monthly mean SLD ranges from 44 h in December to 317 h in June–July. The analysis of the long-term variation in SLD shows its increase from 1961 to 1989 and its decrease starting from 1999 due to an increase in the low cloud cover and high frequency of continuous clouds. The SLD in Tomsk in the modern period has increased relative to the historical period. Regression equations between SLD and the total solar radiation (Q) are derived.
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The study was carried out under the financial support of the Russian Science Foundation (grant no. 17-17-01095) with the use of IAO SB RAS infrastructure created and operated under State Assignment no. AAAA-A17-117021310142-5, including the “Atmosfera” Common Use Center.
The authors declare that they have no conflict of interest.
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Sklyadneva, T.K., Belan, B.D. Variability of Sunlight Duration in Tomsk in 1961–2018. Atmos Ocean Opt 33, 254–259 (2020). https://doi.org/10.1134/S1024856020030112