Salinity-controlled isomerization of lacustrine brGDGTs impacts the associated MBT5ME terrestrial temperature index

doi:10.1016/j.gca.2021.05.004

	Salinity-controlled isomerization of lacustrine brGDGTs impacts the associated MBT5ME terrestrial temperature index
	Wang, Huanye 1,2; Liu, Weiguo 1,3; He, Yuxin 4; Zhou, Aifeng 5,6; Zhao, Hui 6; Liu, Hu 1; Cao, Yunning 1; Hu, Jing 1; Meng, Bowen 7; Jiang, Jiawei 7
刊名	GEOCHIMICA ET COSMOCHIMICA ACTA
	2021-07-15
卷号	305 页码:33-48
关键词	brGDGTs Temperature Salinity MBT5ME Isomerization
ISSN号	0016-7037
DOI	10.1016/j.gca.2021.05.004
通讯作者	Liu, Zhonghui(zhliu@hku.hk)
英文摘要	Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are microbial molecular fossils ubiquitous in natural environments. The correlation between the Methylation Index of brGDGTs (the MBT5ME paleothermometer) and temperature offers an important tool for reconstructing past terrestrial temperatures. However, factors other than temperature could also affect the distribution of brGDGTs in lacustrine systems, hampering the quantitative application of this paleothermometer. Here we investigated brGDGT distributions in contemporary sediments collected from 52 lakes in mid-latitude Asia. Combined with published brGDGT data from other lakes across the globe, we have found a strong salinity control on the relative abundance of 5-methyl brGDGTs versus their late-eluting isomers (including 6-methyl, 7-methyl, and unknown isomers). This allows the development of novel indices based on the isomerization of brGDGTs for tracing past lake water salinity. We also demonstrate , that salinity-controlled isomerization of pentamethylated and hexamethylated brGDGTs can significantly impact the MBT5ME paleothermometer, , potentially leading to an overestimation of past temperature, but the temperature signal can be extracted out of the MBT5ME index after correcting the salinity effect. As demonstrated in application to a Lake Qinghai (China) sediment core spanning the last 18 kyr, our finding could facilitate the simultaneous retrieval of reliable temperature and salinity records using brGDGTs in lacustrine settings, in particular for lakes that have experienced large salinity changes during the geological past. (C) 2021 Elsevier Ltd. All rights reserved.
资助项目	Chinese Academy of Sciences[XDB40000000] ; Chinese Academy of Sciences[XDA2007020202] ; Hong Kong Research Grants Council[17325516] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program[2019QZKK0101] ; West Light Foundation of the Chinese Academy of Sciences[XAB2019A03] ; Youth Innovation Promotion Association, CAS[2019403] ; RSF[177710086] ; RFBR[215553037] ; RFBR[19-05-00403 a] ; RFBR[192905085] ; RFBR[18-35-00072 mol_a] ; RFBR[18-33-20038 mol_a] ; Institute of Geology and Mineralogy SB RAS
WOS关键词	DIALKYL GLYCEROL TETRAETHERS ; CBT PALEOTEMPERATURE PROXY ; QINGHAI-TIBET PLATEAU ; WARM-SEASON BIAS ; LAKE QINGHAI ; ENVIRONMENTAL CONTROLS ; ORGANIC GEOCHEMISTRY ; VEGETATION CHANGES ; CHINA IMPLICATIONS ; MEMBRANE-LIPIDS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000660120900003
资助机构	Chinese Academy of Sciences ; Hong Kong Research Grants Council ; Second Tibetan Plateau Scientific Expedition and Research (STEP) program ; West Light Foundation of the Chinese Academy of Sciences ; Youth Innovation Promotion Association, CAS ; RSF ; RFBR ; Institute of Geology and Mineralogy SB RAS
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/16804]
专题	地球环境研究所_加速器质谱中心第四纪科学与全球变化卓越创新中心
通讯作者	Liu, Zhonghui
作者单位	1.Chinese Acad Sci, Inst Earth Environm, Ctr Excellence Quaternary Sci & Global Change, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Open Studio Oceanic Continental Climate & Environ, Qingdao 266061, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Zhejiang Univ, Sch Earth Sci, Key Lab Geosci Big Data & Deep Resource Zhejiang, Hangzhou 310027, Peoples R China 5.Lanzhou Univ, Coll Earth & Environm Sci, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China 6.Xian Inst Innovat Earth Environm Res, Xian 710061, Peoples R China 7.Univ Hong Kong, Dept Earth Sci, Hong Kong, Peoples R China 8.RAS, Inst Geol & Mineral SB, Novosibirsk 630090, Russia 9.Novosibirsk State Univ, Novosibirsk 630090, Russia
推荐引用方式 GB/T 7714	Wang, Huanye,Liu, Weiguo,He, Yuxin,et al. Salinity-controlled isomerization of lacustrine brGDGTs impacts the associated MBT5ME terrestrial temperature index[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,305:33-48.
APA	Wang, Huanye.,Liu, Weiguo.,He, Yuxin.,Zhou, Aifeng.,Zhao, Hui.,...&Liu, Zhonghui.(2021).Salinity-controlled isomerization of lacustrine brGDGTs impacts the associated MBT5ME terrestrial temperature index.GEOCHIMICA ET COSMOCHIMICA ACTA,305,33-48.
MLA	Wang, Huanye,et al."Salinity-controlled isomerization of lacustrine brGDGTs impacts the associated MBT5ME terrestrial temperature index".GEOCHIMICA ET COSMOCHIMICA ACTA 305(2021):33-48.