Abstract
We investigate the relationship between Eurasian blocking and summer precipitation in the basin of the Selenga River (Lake Baikal’s main tributary) in order to find the reasons of current low-water period in the Lake Baikal basin. In this paper, we study the development of blocking events over Europe and the Russian Far East (RFE) and anomalies in precipitation over the Selenga river basin. Blocking over Europe and the Russian Far East contribute to arid conditions over the southern (Mongolian) part of the Selenga basin and precipitation over the northern (Russian) part of the basin. We show that from 1979 to 2017 there were 10 years with joint blocking events over Europe and RFE in July: 1980, 1981, 1983, 1991, 1999, 2001, 2003, 2010, 2011 and 2014. Months with normal and higher than normal total precipitation in the basin were observed in 1983, 1991, and 2003. Months with lower precipitation were in 1980, 1981, 1999, 2001, 2010, 2011, and 2014. We conclude that simultaneous development of blocking over Europe and RFE for at least three days, along with intensity, duration and localization of blocking are important factors to form conditions favorable for intense precipitation over the northern part of the Selenga basin.
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