Peatland history under post-glacial climate changes in the southern Baikal region: Biogeochemical evidence from the Vydrino Bog (Tankhoi piedmont plain)

Bobrov V.A. Maltsev A.E. Krivonogov S.K. Preis Y.I. Klimin M.A. Leonova G.A.
30 October 2023 Elsevier Ltd

Quaternary International
2023 #672 14 - 29 pp.

The paper presents new data and reviews previously obtained results on the late glacial to Holocene history of peatlands in the southern part of the Baikal region under conditions of regional climate changes. To better understand climate signals, we have combined vegetation and geochemical variation data in 4.6 m thick peat deposits in the Vydrino bog located on the Tankhoi piedmont plain south of Lake Baikal. The territory has been swamped since 13.1 cal ka BP when the peatland started developing as a fen upon a sedimentary substrate. The 13.1–9.5 cal kyr climate record included two events of warming separated by an excursion of dry cold climate. Warming continued till 9.0 cal ka BP and eutrophic peat formation occurred in favorable temperature and moisture conditions. Another warming episode between 9.0 and 8.4 cal ka BP ended up with the Holocene climate optimum while the bog became mesotrophic. About 7.3–6.5 cal ka BP, the temperature and moisture inputs were no longer optimal for fir and spruce forests in the Vydrino area, which led to dramatic changes in landscape and vegetation. The wet and warm climate gradually became drier and colder from 6.5 to 2.3 cal ka BP, with a brief warm excursion about 5.5–5.3 cal ka BP. The peat deposition was interrupted in a cold climate from ∼2.3 cal ka BP to ∼0.7 cal ka BP, and the bog became oligotrophic afterwards. The newly obtained data allowed us to compare the paleoclimatic indicators available for the south Baikal region to determine their compatibility and inconsistency. In addition, we provide a general view to the quality of the climate and environmental reconstructions in the Baikal region by comparison of the data on its peatland study.

Geochemical climate proxy , Holocene , Lateglacial , Paleoclimate , Peatland , Vegetation changes

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Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
Southwest Jiaotong University, Chengdu, China
Novosibirsk State University, Novosibirsk, Russian Federation
Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russian Federation
Institute of Water and Environmental Problems, Far East Branch of the Russian Academy of Sciences, Khabarovsk, Russian Federation

Sobolev Institute of Geology and Mineralogy
Korkyt Ata Kyzylorda University
Southwest Jiaotong University
Novosibirsk State University
Institute of Monitoring of Climatic and Ecological Systems
Institute of Water and Environmental Problems

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