Climatic changes in the Arctic territories of Eastern Siberia over the last millennium according to lithological-geochemical data of bottom sediments of Lake Peyungda (Krasnoyarsk region, Evenkia)

Using scanning micro-X-ray fluorescence analysis using synchrotron radiation, profiles of changes in the depth of the section in the elemental composition of the banded clays of Lake Peyungda (Krasnoyarsk Territory, Evenkia), located 30 km southwest of the epicenter of the Tunguska event (1908), were obtained. The age model is confirmed by the presence of a dated layer of anomalous thickness associated with the fall and explosion of the Tunguska cosmic body (TCB). Changes in element contents in dated core layers are compared with instrumental meteorological observation data over the last century, and a relationship is found between the average annual temperature of the region and the elemental composition of coeval layers of bottom sediments (transfer function). Approximation of the transfer function to the sampling depth of the sedimentary section made it possible to reconstruct the air temperature in the studied region over the past 1000 years. Comparison of the resulting reconstruction of average annual temperatures in the study area with global temperature reconstructions for the Arctic region for the same period shows the presence of general trends and extremes.