New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China

doi:10.1016/j.epsl.2019.115792

	New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China
	Yao, Yuan 1,2; Zhao, Jiaju 2; Longo, William M.1; Li, Gaoyuan 3; Wang, Xian 1; Vachula, Richard S.1; Wang, Karen J.1; Huang, Yongsong 1,2
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2019-12-01
卷号	527 页码:11
关键词	alkenones Group I Isochrysidales DNA winter temperature proxy volcanic lakes
ISSN号	0012-821X
DOI	10.1016/j.epsl.2019.115792
通讯作者	Huang, Yongsong(yongsong_huang@brown.edu)
英文摘要	The distinctive long-chain alkenones (LCAs) produced by Group I Isochrysidales from freshwater and oligohaline lakes have great potential for quantitative paleotemperature reconstructions. The widespread application of sedimentary Group I LCAs, however, is hampered by an incomplete understanding of the environmental controls on the occurrence of Group I LCAs in freshwater lakes. The correspondence between Group I LCA concentrations and pH (6.2-8.5) in northern Alaskan freshwater lakes (Longo et al., 2016) suggests that Group I Isochrysidales may preferentially thrive in freshwater lakes with high pH. Here, we systematically study LCA distributions, haptophyte-specific 18S rDNA sequences, and concentrations of major ions and trace elements in 18 freshwater volcanic lakes in northeastern China with an extended pH range from 7.17 to 9.99. We find that 11 of the 18 lakes examined contain Group I LCAs and the corresponding DNA sequences of their producers. Our DNA results indicate that the dominant alkenone producer in all 11 lakes is closely related to the Group I Greenland OTU 5 genotype, with the exception of two anthropogenically impacted lakes where small numbers of Group II sequences are found. Statistical analyses indicate that the highest concentrations of Group I LCAs are found in oligotrophic freshwater lakes with pH ranging from similar to 7.3 to 8.8. We find that elevated concentrations of certain trace elements may lead to the disappearance of Group I LCAs despite lake water falling within the optimal pH range. Together with previously published Group I LCA data from the temperature calibration in Northern Hemisphere freshwater lakes (Longo et al., 2018), we find, for the first time, that Group I R3b (R3b = C-37:3b/(C38:3bEt + C-37:3b)) values are most sensitive to winter temperature changes when mean winter temperature is higher than similar to-20 degrees. Our results suggest that the freshwater volcanic lakes in northeastern China are highly valuable targets for paleotemperature reconstructions using Group I LCAs. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	National Natural Science Foundation of China[41573113] ; National Natural Science Foundation of China[41702187] ; National Natural Science Foundation of China[41602193] ; State Key Laboratory of Loess and Quaternary Geology in the Institute of Earth Environment, Chinese Academy of Sciences[SKLLQGPY1704] ; U.S. National Science Foundation[EAR-1122749] ; U.S. National Science Foundation[PLR-1503846] ; U.S. National Science Foundation[EAR-1502455] ; U.S. National Science Foundation[EAR-1762431]
WOS关键词	LONG-CHAIN-ALKENONES ; TEMPERATURE ; DISTRIBUTIONS ; ICE ; PALEOTEMPERATURE ; ALKENOATES ; SEDIMENTS ; LACUSTRINE ; CLIMATE ; CALIBRATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000491609700016
资助机构	National Natural Science Foundation of China ; State Key Laboratory of Loess and Quaternary Geology in the Institute of Earth Environment, Chinese Academy of Sciences ; U.S. National Science Foundation
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/12933]
专题	地球环境研究所_古环境研究室
通讯作者	Huang, Yongsong
作者单位	1.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Shaanxi, Peoples R China 3.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Yao, Yuan,Zhao, Jiaju,Longo, William M.,et al. New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,527:11.
APA	Yao, Yuan.,Zhao, Jiaju.,Longo, William M..,Li, Gaoyuan.,Wang, Xian.,...&Huang, Yongsong.(2019).New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China.EARTH AND PLANETARY SCIENCE LETTERS,527,11.
MLA	Yao, Yuan,et al."New insights into environmental controls on the occurrence and abundance of Group I alkenones and their paleoclimate applications: Evidence from volcanic lakes of northeastern China".EARTH AND PLANETARY SCIENCE LETTERS 527(2019):11.