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- Title
The Holocene climate change in South Siberia and its linkage to the Siberia High.
- Authors
Chen, You-Syuan; Li, Hong-Chun; Yin, Jian-Jun; Mii, Horng-Sheng; Blyakharchuk, Tatiana; Shen, Chuan-Chou
- Abstract
High latitude region such as Siberia is very sensitive to climate change since the currentwarming causes significant changes in high latitudes. Few high-resolution Holoceneclimatic records of Siberia have been reconstructed. The climate of this region isaffected by Westerly, polar front and the Siberia High. In this study, we report the firsthigh-resolution (4-20 yr) stalagmite δ18O and δ13C records of late Holocene inAltai-Sayan Mountain region (Nadezhda Cave, 52º39’N, 88º39’E, 550m a.s.l.).Stalagmite HOP-1 is 22 cm long and has pure calcite with milk white color. Verylow U content (238U = ∼70 ppb) and relatively high Th content (232Th = 2∼9.3ppb) of HOP-1 resulted in unsuccessful 230Th/U dating. The chronology of HOP-1was established by AMS 14C dating and 210Pb dating methods. The excess 210Pbdecay trend in the top part and dripping water activity indicate that the surfaceof the stalagmite is modern and contains dead carbon influence (DCI) about 400years. By subtracting this 400 years of initial age and assuming constant DCI, atotal of 32 AMS 14C dates were used to construct the age model. The age modelshows that this stalagmite grew continously over the last 6,000 years. A total of 972subsamples were measured δ18O and δ13C, showing heavier δ18O and δ13C valuescorresponding dark layers with slower growth rates. The HOP-1 record shows 5 cold and dryperiods around 4.2-4.9 kyr BP, 1.7-2.3 kyr BP, 1.3 kyr BP, 0.4 kyr BP, and 0.1 kyr BPcorresponding to low total solar irradiance. These cold and dry periods might probably belinked to the enhancement of the Siberia High. Our stable isotope records and thenearby pollen record show that the climate of the Altai region was deteriorated atabout 2.5 kyr BP which might be the cause of the decline of Scythian Culture.
- Subjects
SIBERIA (Russia); CLIMATE change; STABLE isotopes; STALACTITES &; stalagmites; CALCITE; GROWTH rate
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article