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Deglacial and Holocene Archaeal Lipid-Inferred Paleohydrology and Paleotemperature History of Lake Qinghai, Northeastern Qinghai–Tibetan Plateau

Published online by Cambridge University Press:  20 January 2017

Huanye Wang ,
Hailiang Dong ,
Chuanlun L. Zhang ,
Hongchen Jiang ,
Zhonghui Liu ,
Meixun Zhao  and
Weiguo Liu
Huanye Wang
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi'an 710075, China Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining, Qinghai 810008, China University of Chinese Academy of Sciences, Beijing 100049, China
Hailiang Dong
Affiliation:
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, China Department of Geology and Environmental Earth Science, Miami University, Oxford, OH 45056, USA
Chuanlun L. Zhang
Affiliation:
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China Department of Marine Sciences, The University of Georgia, Athens, GA 30602, USA
Hongchen Jiang
Affiliation:
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
Zhonghui Liu
Affiliation:
Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
Meixun Zhao
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology (Ocean University of China), Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China
Weiguo Liu*
Affiliation:
State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi'an 710075, China School of Human Settlement and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China
*
*Corresponding author at: State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi'an 710075, China. E-mail address:liuwg@loess.llqg.ac.cn (W. Liu).
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Abstract

We investigate the distribution of archaeal lipids in a 5.8-m-long sedimentary core recovered from Lake Qinghai to extract regional hydroclimate and temperature signals since the last deglaciation for this important region. The paleohydrology was reconstructed from the relative abundance of thaumarchaeol (%thaum) and the archaeol and caldarchaeol ecometric (ACE) index. The %thaum-inferred lake-level record was extended to deglaciation, showing three periods (11.9–13.0, 14.1–14.7 and 15.1–17.2 cal ka BP) with relatively higher lake levels than those during the early Holocene. The ACE record demonstrates three periods (10.6–11.2, 13.2–13.4 and 17.4–17.6 cal ka BP) of elevated salinity when the lake was shallow. Filtered TEX86 record based on archaeal lipid distributions corresponded to relatively higher lake levels, implying that a certain lake size is required for using the TEX86 paleothermometer. At 1–4 cal ka BP, the reconstructed temperature fluctuated significantly and correlated negatively with inferred lake level, indicating that lake temperature and hydrological change might be coupled during this period. We attribute this co-variance to the importance of summer temperature in controlling evaporation for this arid/semi-arid region. Moreover, our results indicate that archaeal lipids have potential in reconstructing paleoclimate patterns from lacustrine sedimentary cores, but the data should be interpreted with care.

Keywords

Archaeal lipidsThaumarchaeolACETEX86Lake levelSalinityPaleotemperaturePaleoclimate patternsLake QinghaiQinghai–Tibetan Plateau
Type
Research Article
Information
Quaternary Research , Volume 83 , Issue 1 , January 2015 , pp. 116 - 126
Copyright
University of Washington

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