Variation of Isoprenoid GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry

doi:10.3389/fmars.2021.715708

	Variation of Isoprenoid GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry
	Guo, Jinqiang 1,2,3,4; Yuan, Huamao1,2,3,4 ; Song, Jinming1,2,3,4 ; Qu, Baoxiao1,2,3,4 ; Xing, Jianwei1,2,3,4 ; Wang, Qidong1,2,3,4 ; Li, Xuegang 1,2,3,4; Duan, Liqin 1,2,3,4; Li, Ning 2,3,4,5; Wang, Yingxia 2,4,5
	2021-08-18
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	8 页码:11
通讯作者	Yuan, Huamao([email protected]) ; Song, Jinming([email protected])
摘要	Isoprenoid glycerol dialkyl glycerol tetraethers (isoGDGTs) derived from archaea are lipid biomarkers that exhibit high sensitivity to changes in water temperature, leading to the widespread application of the isoGDGT-based tetraether index of 86 carbon atoms (TEX86) in surface seawater temperature (SST) reconstruction. However, there remain some uncertainties regarding the robustness of TEX86 under changing water conditions (e.g., variations in water depth, oxygen and pH). Here, we analyzed isoGDGTs in suspended particles at different depths of the East China Sea (ECS) during summer 2020, aiming to constrain the applicability of the TEX86 proxy in coastal waters. Our data showed that the isoGDGTs were mainly derived from planktonic Thaumarchaeota, as revealed by the low ratio of GDGT-0/crenarchaeol (< 0.5). The vertical distribution of isoGDGT concentration depicted a downward increase from the surface to the bottom. This observation was likely shaped by Thaumarchaeota, which regulate the extent of ammonia oxidation based on the availability of ammonium. The occurrence of maximal isoGDGT concentrations in the bottom layer suggests that the isoGDGTs in sediments are mainly controlled by bottom archaeal production rather than surface archaeal production. By reanalyzing the published isoGDGT data of surface sediments in the ECS inner shelf, we found that the sedimentary TEX86 relates much better to the annual mean bottom seawater temperature (BST) than to the annual mean SST, indicating that sedimentary TEX86 is more inclined to be a proxy for the BST in the shallow ECS. In addition, the positive bias of TEX86 driven by low dissolved oxygen and low pH was observed under the pycnocline, indicating that the application of TEX86 to reconstruct seawater temperature should be carefully appraised in coastal environments with strong water column stratification.
关键词	isoprenoid GDGTs suspended particulate matter stratification ammonium dissolved oxygen East China Sea
DOI	10.3389/fmars.2021.715708
收录类别	SCI
语种	英语
资助项目	Key Project of Center for Ocean Mega-Science of the Chinese Academy of Sciences; Strategic Priority Research Program of the Chinese Academy of Sciences; Key Science and Technology Innovation Program; Shandong Province; Qingdao National Laboratory for Marine Science and Technology; National Natural Science Foundation of China; Two-Hundred Talents Plan of Yantai Scholar Project; Shandong Provincial Natural Science Foundation
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:000729337400001
出版者	FRONTIERS MEDIA SA
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/177477
专题	海洋生态与环境科学重点实验室
通讯作者	Yuan, Huamao; Song, Jinming
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Publ Technol Serv Ctr, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Guo, Jinqiang,Yuan, Huamao,Song, Jinming,et al. Variation of Isoprenoid GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry[J]. FRONTIERS IN MARINE SCIENCE,2021,8:11.
APA	Guo, Jinqiang.,Yuan, Huamao.,Song, Jinming.,Qu, Baoxiao.,Xing, Jianwei.,...&Wang, Yingxia.(2021).Variation of Isoprenoid GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry.FRONTIERS IN MARINE SCIENCE,8,11.
MLA	Guo, Jinqiang,et al."Variation of Isoprenoid GDGTs in the Stratified Marine Water Column: Implications for GDGT-Based TEX86 Paleothermometry".FRONTIERS IN MARINE SCIENCE 8(2021):11.

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