A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai, northeastern Qinghai-Tibet Plateau: Implications for paleoclimate reconstruction

doi:10.1007/s11430-015-5213-4

	A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai, northeastern Qinghai-Tibet Plateau: Implications for paleoclimate reconstruction
	Liu WeiGuo 3; Jiang HongChen 2; Wang HuanYe 3,4; Dong HaiLiang 5; Zhang ChuanLun 1
刊名	SCIENCE CHINA-EARTH SCIENCES
	2016-05-01
卷号	59 期号:5 页码:951-960
关键词	Lake Qinghai Bit Lake Water Depth Precipitation Paleohydrology
DOI	10.1007/s11430-015-5213-4
文献子类	Article
英文摘要	Branched and Isoprenoid Tetraether (BIT) index was considered as a proxy for terrestrial organic matter input in lake sediments, based on the assumption that branched glycerol dialkyl glycerol tetraethers (bGDGTs) are mainly derived from terrestrial soils. However, mounting evidences have showed that the in situ production of bGDGTs is widespread in lakes, challenging BIT as a reliable terrestrial input proxy. Recently, BIT has been proven to be a reliable proxy for paleohydrology in a small crater lake (Lake Challa) in accordance with a different mechanism. However, the response of BIT to paleohydrology variation may differ for different lakes. In this study, we investigate the variations in the BIT index and the concentrations of its related GDGTs in a 12-ka sediment core from Lake Qinghai, in combination with our previous results for surface sediments. We find that variations in BIT strongly depend on the concentration of crenarchaeol in both surface and ancient sediments of this lake, whereas bGDGT concentration varies much less remarkably. Considering that crenarchaeol production is positively correlated with water depth in Lake Qinghai, water depth may exert negative control on the BIT index in this lake. This case is inconsistent with the positive relationship between BIT and lake levels or rainfall intensity reported for Lake Challa, suggesting that the response of BIT to local paleohydrology is site specific in lacustrine systems. Hence, the application of sedimentary BIT as a paleohydrological proxy in a specific lake requires caution before confirming the environmental controls on BIT in that lake.
WOS关键词	DIALKYL GLYCEROL TETRAETHERS ; TERRESTRIAL ORGANIC-MATTER ; MEMBRANE-LIPID DISTRIBUTIONS ; EQUATORIAL EAST-AFRICA ; GDGT-BASED PROXIES ; WATER-COLUMN ; TEX86 PALEOTHERMOMETER ; PARTICULATE MATTER ; MOISTURE EVOLUTION ; MARINE-SEDIMENTS
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000374966200007
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5782]
专题	地球环境研究所_加速器质谱中心
作者单位	1.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 2.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China 3.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China 5.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Liu WeiGuo,Jiang HongChen,Wang HuanYe,et al. A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai, northeastern Qinghai-Tibet Plateau: Implications for paleoclimate reconstruction[J]. SCIENCE CHINA-EARTH SCIENCES,2016,59(5):951-960.
APA	Liu WeiGuo,Jiang HongChen,Wang HuanYe,Dong HaiLiang,&Zhang ChuanLun.(2016).A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai, northeastern Qinghai-Tibet Plateau: Implications for paleoclimate reconstruction.SCIENCE CHINA-EARTH SCIENCES,59(5),951-960.
MLA	Liu WeiGuo,et al."A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai, northeastern Qinghai-Tibet Plateau: Implications for paleoclimate reconstruction".SCIENCE CHINA-EARTH SCIENCES 59.5(2016):951-960.