Unusually low TEX86 values in the transitional zone between Pearl River estuary and coastal South China Sea: Impact of changing archaeal community composition

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	Unusually low TEX86 values in the transitional zone between Pearl River estuary and coastal South China Sea: Impact of changing archaeal community composition
	Wang, Jin-Xiang; Wei, Yuli; Wang, Peng; Hong, Yiguo; Zhang, Chuanlun L.
刊名	CHEMICAL GEOLOGY
	2015
卷号	402 页码:18-29
关键词	TEX86 Isoprenoid GDGTs The lower Pearl River Estuary South China Sea
通讯作者	jinxiang@uga.edu ; yl_wei@shou.edu.cn ; archaeazhang_1@tongji.edu.cn
中文摘要	TEX86, calculated based on the distribution of isoprenoid glycerol dialkyl glycerol tetraethers (GDGTs), is used worldwide for paleotemperature reconstruction in marine and lacustrine environments. Recently, however, increasing evidence showed that TEX86 could be affected by multiple environmental variables. In this study, TEX86 was calculated for core and polar GDGTs obtained from water column and surface sediments in the lower Pearl River and its estuary. Together with previously published core GDGT data from the coastal and open South China Sea (SCS), a comparison was made between TEX86-derived and satellite-based surface water temperature, which showed a TEX86-temperature minimum that is considerably lower than winter satellite temperature in the transitional zone between the Pearl River estuary and the coastal SCS. TEX86 showed significantly positive correlation with GDGT-2 and GDGT-3 in this transitional zone, indicating that they are the primary compounds for the TEX86 bias toward cooler temperature. Lipid and molecular DNA data both indicate that the variation in archaeal community composition rather than water depth or seasonality is likely the crucial factor causing the deviation of TEX86 in the transitional area. Our study has implications for studies in ancient continental margins where unusually low TEX86 temperatures may be observed in the geological record. (C) 2015 Elsevier B.V. All rights reserved.
学科主题	Geochemistry & Geophysics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15085]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 GB/T 7714	Wang, Jin-Xiang,Wei, Yuli,Wang, Peng,et al. Unusually low TEX86 values in the transitional zone between Pearl River estuary and coastal South China Sea: Impact of changing archaeal community composition[J]. CHEMICAL GEOLOGY,2015,402:18-29.
APA	Wang, Jin-Xiang,Wei, Yuli,Wang, Peng,Hong, Yiguo,&Zhang, Chuanlun L..(2015).Unusually low TEX86 values in the transitional zone between Pearl River estuary and coastal South China Sea: Impact of changing archaeal community composition.CHEMICAL GEOLOGY,402,18-29.
MLA	Wang, Jin-Xiang,et al."Unusually low TEX86 values in the transitional zone between Pearl River estuary and coastal South China Sea: Impact of changing archaeal community composition".CHEMICAL GEOLOGY 402(2015):18-29.