Impact of water depth on the distribution of iGDGTs in the surface sediments from the northern South China Sea： applicability of TEXss in marginal seas

作     者：Jiali CHEN Pengju HU Xing LI Yang YANG Jinming SONG Xuegang LI Huamao YUAN sing Li Xiaoxia LU 

作者机构：State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan 430074 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China College of Marine Science and Technology China University of Geosciences Wuhan 430074 China Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China No.5 Middle School of Nan Chang Nanchang 330029 China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2018年第12卷第1期

页      面：95-107页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 081202[工学-计算机软件与理论] 

基　　金：We thank each member of the organic geochemistry group in the State Key Laboratory of Biogeology and Environmental Geology for technical support. We also thank Y. Qin  x. Chen and L. Gong from China University of Geosciences for help with data processing. We also thank Changbing Yang and Angelo R. Yang from The University of Texas in Austin for the language polishing. The research was funded by the National Natural Science Foundation of China （Grant No. 41376090）  the ＂Strategic Priority Research Program＂ of the Chinese Academy of Sciences （XDA 11020102）  The Project of China Geological Survey （DD20160138）  and Marine Safeguard Project （GZH201200503）. 

主　　题：iGDGTs distribution South China Sea（SCS） sea surface temperature water depth 

摘      要：The TEXh86 paleothermometer on the base of isoprenoid glycerol dialkyl glycerol tetraethers （iGDGTs） has been widely applied to various marine settings to reconstruct past sea surface temperatures （SSTs）. However, it remains uncertain how well this proxy reconstructs SSTs in marginal seas. In this study, we analyze the environmental factors governing distribution ofiGDGTs in surface sediments to assess the applicability of TEXH86 paleothermometer in the South China Sea （SCS）. Individual iGDGT concentrations increase gradually eastwards. Redundancy analysis based on the relative abundance of an individual iGDGT compound and environmental parameters suggests that water depth is the most influential factor to the distribution of iGDGTs, because thaumarchaeota communities are water-depth dependent. Interestingly, the SST difference （AT） between TEXH86 derived temperature and remote-sensing SST is less than 1°C in sediments with water depth 〉 200 m, indicating that TEXH86 was the robust proxy to trace the paleo-SST in the region if water depth is greater than 200 m.