Distribution and Carbon Isotopic Composition of Long-Chain Leaf Wax n-Alkanes from Holocene Lake Sediments in the Altai Mountains | Sciact - CRIS-system of Boreskov Institute of Catalysis

Distribution and Carbon Isotopic Composition of Long-Chain Leaf Wax n-Alkanes from Holocene Lake Sediments in the Altai Mountains Full article

Journal

Quaternary International
ISSN: 1040-6182

Output data

Year: 2022, Volume: 625, Pages: 29-37 Pages count : 9 DOI: 10.1016/j.quaint.2022.04.008

Tags

n-alkanes; Carbon isotopic composition; Holocene moisture; Altai mountains; Arctic sea

Authors

Li Qi ^1,2 , Zhao Jiayu ^1,2 , Xie Manman ³ , Dong Haowei ³ , Darin Andrei ⁴ , Darin Fedor ⁵ , Rakshun Yakov ⁵ , Su Youliang ⁶ , Wang Shuxian ³ , Sun Qing ³ , Chu Guoqiang ^1,6

Affiliations

1	Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China
2	University of Chinese Academy of Sciences, Beijing, 10049, China
3	National Research Center of Geoanalysis, Beijing, 100037, China
4	Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Science, Novosibirsk, 630090, Russia
5	Budker Institute of Nuclear Physics, Siberian Branch of Russian Academy of Science, Novosibirsk, 630090, Russia
6	CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China

The Altai Mountains are located at the junction of Asia and Europe and pathways linking East Asian climate with the Arctic and North Atlantic. Here, we report a record of n-alkanes from the sediments of Shuanghu Lake in the Altai Mountains. In this forested region, the vegetation is dominated by C3 plants and the long-chain n-alkanes (C29–C31) in the lake sediments are predominantly derived from leaf wax lipids. The compound-specific carbon isotopic values of the long-chain n-alkanes are sensitive to regional moisture. Both the δ13C29–31 value and the Paq index show a decreasing trend since ∼9.0 kyr BP, implying an increase in moisture. This trend is punctuated by abrupt decreases in isotopic values centered at 8.2, 7.4, 5.6, 3.0, 2.0 and 0.2 kyr BP, which may indicate cold and wet events on decadal–centennial timescales. The Holocene hydrological patterns recorded at Shuanghu Lake are different from those from monsoonal Asia and they may reflect a response to decreasing Arctic sea ice cover that provided an enhanced moisture source and promoted increased heavy snowfall in the study region, or an increase in the temperature gradient and strength of the jet stream and extratropical cyclones at mid-latitudes, as proposed previously.

Li Q. , Zhao J. , Xie M. , Dong H. , Darin A. , Darin F. , Rakshun Y. , Su Y. , Wang S. , Sun Q. , Chu G.
Distribution and Carbon Isotopic Composition of Long-Chain Leaf Wax n-Alkanes from Holocene Lake Sediments in the Altai Mountains
Quaternary International. 2022. V.625. P.29-37. DOI: 10.1016/j.quaint.2022.04.008 WOS Scopus РИНЦ OpenAlex

Submitted:	Feb 19, 2022
Accepted:	Apr 12, 2022
Published online:	Apr 17, 2022
Published print:	Jul 10, 2022

Web of science:	WOS:000818781500003
Scopus:	2-s2.0-85128563650
Elibrary:	48429328
OpenAlex:	W4224003889

DB	Citing
Scopus	3
Web of science	3
OpenAlex	3