Abstract

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.

中文翻译：

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1961–2018年托木斯克日照时间的变化

摘要

分析了托木斯克（Tomsk）1961年至2018年以及分别在1961–1990年和1981–2010年期间的日照持续时间（SLD）。使用1996-2018年在IAO SB RAS TOR站获得的云和太阳总辐射数据。实际的长期每月平均SLD范围从12月的44小时到6月至7月的317小时。对SLD长期变化的分析表明，由于低云量的增加和连续云的出现频率的增加，SLD在1961年至1989年之间有所增加，并在1999年开始下降。与历史时期相比，现代时期的托木斯克SLD有所增加。推导了SLD与太阳总辐射（Q）之间的回归方程。