Dendroindication of the hydroclimatic signal in lake basins of the Baikal rift
A.S. BALYBINA, O.V. VASILENKO
V.B. Sochava Institute of Geography, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia
Keywords: tree-ring chronologies, annual rings growth, response function, Cisbaikalia, Khubsugul region, solar activity
Abstract
The article presents the results of application of the dendrochronological method of indicating the heliophysical and hydroclimatic signal on small time scales (from decades to centuries) in the lake basins of the Baikal rift zone. Three items were considered: dendroindication of climatic parameters in Cisbaikalia; dendroindication of the dynamics of the Lake Baikal level; and assessment of the hydroclimatic signal in the Khubsugul region. It has been found that the values of the width of annual rings is indicative of minima and maxima in the values of air and soil temperature, but the reconstructed series gives the smoothed values. The last cycle of the soil temperature increase may be a manifestation of an extreme climate warming, including soil warming. In the reconstructed series of the Lake Baikal level values, various cycles from 53 to 11 years were detected using the spectral Fourier analysis. Consequently, formerly observed periods of a low lake level were followed by a recovery to normal and then even high values. A high response in the larch growth to summer air temperatures (June-August) is observed in the Khubsugul region. Comparison of the indices of the annual rings width with fluctuations in solar activity suggests a connection between these characteristics.
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