Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy

Yuan Yao; Jianghu Lan; Jiaju Zhao; Richard S. Vachula; Hai Xu; Yanjun Cai; Hai Cheng; Yongsong Huang

doi:10.1029/2020GL089257

Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy

Yuan Yao, Jianghu Lan, Jiaju Zhao, Richard S. Vachula, Hai Xu, Yanjun Cai, Hai Cheng, Yongsong Huang

Earth and Environmental Sciences-Twin Cities

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK₃₇ index. Our record shows an abrupt decrease in salinity by more than 5‰ since the “early” Little Ice Age (LIA) (about CE 1150), which can be attributed to the combined effect of regional wetting, cooling, and topographic features. Combined with other moisture records in the region, we find two periods of relatively wet conditions during CE 1150–1550 and 1850 to present, which may be linked to Arctic sea ice expansion due to natural variability and, from CE 1950, anthropogenically induced warming. The wet conditions during CE 1206–1260 may have favored the spread of the Mongol Empire across the entire core area of ACA.

Original language	English (US)
Article number	e2020GL089257
Journal	Geophysical Research Letters
Volume	47
Issue number	16
DOIs	https://doi.org/10.1029/2020GL089257
State	Published - Aug 28 2020

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Nos. 41702187; 41888101), the Fundamental Research Funds for the Central Universities, the Strategic Priority Research Program of Chinese Academy of Sciences (XDB40010300), and the 2nd Tibetan Plateau Scientific Expedition and Research (2019QZKK0101). We thank J. Jing for assistance during sample pretreatment and M. Ran and H. Xie for providing the A/C data in Lake Aibi and δC data of bulk organic matter in Lujiaowan loess. We are also grateful for the comments from two anonymous reviewers that helped to improve the manuscript. 13

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

Group I Isochrysidales
alkenone isomer
arid central Asia
early Little Ice Age
salinity
westerly

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10.1029/2020GL089257

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title = "Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy",

abstract = "Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK37 index. Our record shows an abrupt decrease in salinity by more than 5‰ since the “early” Little Ice Age (LIA) (about CE 1150), which can be attributed to the combined effect of regional wetting, cooling, and topographic features. Combined with other moisture records in the region, we find two periods of relatively wet conditions during CE 1150–1550 and 1850 to present, which may be linked to Arctic sea ice expansion due to natural variability and, from CE 1950, anthropogenically induced warming. The wet conditions during CE 1206–1260 may have favored the spread of the Mongol Empire across the entire core area of ACA.",

keywords = "Group I Isochrysidales, alkenone isomer, arid central Asia, early Little Ice Age, salinity, westerly",

author = "Yuan Yao and Jianghu Lan and Jiaju Zhao and Vachula, {Richard S.} and Hai Xu and Yanjun Cai and Hai Cheng and Yongsong Huang",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (Nos. 41702187; 41888101), the Fundamental Research Funds for the Central Universities, the Strategic Priority Research Program of Chinese Academy of Sciences (XDB40010300), and the 2nd Tibetan Plateau Scientific Expedition and Research (2019QZKK0101). We thank J. Jing for assistance during sample pretreatment and M. Ran and H. Xie for providing the A/C data in Lake Aibi and δC data of bulk organic matter in Lujiaowan loess. We are also grateful for the comments from two anonymous reviewers that helped to improve the manuscript. 13 Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

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AU - Yao, Yuan

AU - Lan, Jianghu

AU - Zhao, Jiaju

AU - Vachula, Richard S.

AU - Xu, Hai

AU - Cai, Yanjun

AU - Cheng, Hai

AU - Huang, Yongsong

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (Nos. 41702187; 41888101), the Fundamental Research Funds for the Central Universities, the Strategic Priority Research Program of Chinese Academy of Sciences (XDB40010300), and the 2nd Tibetan Plateau Scientific Expedition and Research (2019QZKK0101). We thank J. Jing for assistance during sample pretreatment and M. Ran and H. Xie for providing the A/C data in Lake Aibi and δC data of bulk organic matter in Lujiaowan loess. We are also grateful for the comments from two anonymous reviewers that helped to improve the manuscript. 13 Publisher Copyright: ©2020. American Geophysical Union. All Rights Reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8/28

Y1 - 2020/8/28

N2 - Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK37 index. Our record shows an abrupt decrease in salinity by more than 5‰ since the “early” Little Ice Age (LIA) (about CE 1150), which can be attributed to the combined effect of regional wetting, cooling, and topographic features. Combined with other moisture records in the region, we find two periods of relatively wet conditions during CE 1150–1550 and 1850 to present, which may be linked to Arctic sea ice expansion due to natural variability and, from CE 1950, anthropogenically induced warming. The wet conditions during CE 1206–1260 may have favored the spread of the Mongol Empire across the entire core area of ACA.

AB - Hydroclimatic variations of arid central Asia (ACA) significantly impact regional ecosystems and human civilizations. Here we present a lake water salinity record of the last 3,000 years from Lake Sayram in the core area of ACA using a new alkenone isomer-based RIK37 index. Our record shows an abrupt decrease in salinity by more than 5‰ since the “early” Little Ice Age (LIA) (about CE 1150), which can be attributed to the combined effect of regional wetting, cooling, and topographic features. Combined with other moisture records in the region, we find two periods of relatively wet conditions during CE 1150–1550 and 1850 to present, which may be linked to Arctic sea ice expansion due to natural variability and, from CE 1950, anthropogenically induced warming. The wet conditions during CE 1206–1260 may have favored the spread of the Mongol Empire across the entire core area of ACA.

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Abrupt Freshening Since the Early Little Ice Age in Lake Sayram of Arid Central Asia Inferred From an Alkenone Isomer Proxy

Abstract

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