The aim of the research was to identify trends and changes of moisture supply, global and local climate regime of the Central ecological zone of the Baikal natural territory (the Selenga River). For this, wet sediment core samples were analyzed by scanning X-ray fluorescence spectrometry (SRXFA scanning) in the context of paleoclimate studies. The new SRXFA station on the VEPP-4M storage ring (BINP RAS) was used to determine the elemental composition of wet cores, which allows us to significantly expand the set of detectable elements to 35 or more, including lanthanides (La, Ce, Pr, Nd, Sm). The use of this technique in the study of wet bottom sediments showed a high relevance of this method when displaying short-period climatic fluctuations. The obtained data can be used in an interdisciplinary aspect, and in particular, when predicting the water content of Lake Baikal and as a result when planning the activities of the Angarsk HPP cascade. Work is partially supported by RFBR gant 17-29-05016 офи_м.