Subsection: PALEOGEOGRAPHY V.L. Koshkarova and A.D. Koshkarov* REGIONAL SIGNATURES OF CHANGING LANDSCAPE AND CLIMATE OF NORTHERN CENTRAL SIBERIA IN THE HOLOCENE Institute of Forest, Siberian Branch of the RAS, Akademgorodok, Krasnoyarsk, 660036, RussiaJ* Krasnoyarsk State Pedagogical University, 89 ul. A. Lebedevoi, Krasnoyarsk, 660049, Russia Russian geology and geophysics, 2004, N 6, v. 45, p. 672-685
abstract:
On the basis of geochronological and palynological materials, 25 sections of Holocene deposits and soils of northern Central Siberia were studied by paleocarpological methods. Special attention was given to the reconstruction of the dynamics of speciation of forest cover in time and space. As a result, climatic and ecological settings have been dynamically portrayed for each kind of landscape, and quantitative parameters of paleoclimates have been calculated. The main peaks of climatic changes of the postglacial history have been detected in the ranges 8.5-8.0 ka (thermal maximum) and 2.5-2.0 ka (thermal minimum). Importantly, the thermal maximum is characterized by warming up by 3-9 °C in the winter, and by 2-6 °C, in the summer. The anomaly in moisture content was insignificant. In the Middle Holocene (6.5-5.0 ka), the positive temperature trend was kept, but it was accompanied by a nearly double increase in annual atmospheric wetting. During the Late Holocene cooling (2.5-2.0 ka), the negative temperature trend led to the degradation of forest vegetation which at that time remained only in the extreme south of the territory.
