Ubiquitous production of branched glycerol dialkyl glycerol tetraethers   (brGDGTs) in global marine environments: a new source indicator for   brGDGTs

doi:10.5194/bg-13-5883-2016

CORC > 北京大学 > 城市与环境学院

	Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs
	Xiao, Wenjie ; Wang, Yinghui ; Zhou, Shangzhe ; Hu, Limin ; Yang, Huan ; Xu, Yunping
刊名	BIOGEOSCIENCES
	2016
关键词	TERRESTRIAL ORGANIC-MATTER CBT PALEOTEMPERATURE PROXY SEA-SURFACE TEMPERATURE GDGT-BASED PROXIES SOUTH CHINA SEA MEMBRANE-LIPIDS BIT INDEX GEOCHEMICAL PROXIES CONTINENTAL-MARGIN LAKE-SEDIMENTS
DOI	10.5194/bg-13-5883-2016
英文摘要	Presumed source specificity of branched glycerol dialkyl glycerol tetraethers (brGDGTs) from bacteria thriving in soil/peat and isoprenoid GDGTs (iGDGTs) from aquatic organisms led to the development of several biomarker proxies for biogeochemical cycle and paleoenvironmental reconstructions. However, recent studies reveal that brGDGTs are also produced in aquatic environments besides soils and peat. Here we examined three cores from the Bohai Sea, and found distinct difference in brGDGT compositions varying with the distance from the Yellow River mouth. We thus propose an abundance ratio of hexamethylated to pentamethylated brGDGT (IIIa / IIa) to evaluate brGDGT sources. The compilation of globally distributed 1354 marine sediments and 589 soils shows that the IIIa / IIa ratio is generally < 0.59 in soils and 0.59-0.92 and > 0.92 in marine sediments with and without significant terrestrial inputs, respectively. Such disparity confirms the existence of two sources for brGDGTs, a terrestrial origin with lower IIIa / IIa and a marine origin with higher IIIa / IIa, which is likely attributed to a generally higher pH and the production of brGDGTs in cold deep water in marine waters. The application of the IIIa / IIa ratio to the East Siberian Arctic Shelf proves it to be a sensitive source indicator for brGDGTs, which is helpful for accurate estimation of organic carbon source and paleoclimates in marine settings.; National Science Foundation of China [41476062]; SCI(E); ARTICLE; ypxu@shou.edu.cn; 20; 5883-5894; 13
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/458678]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Xiao, Wenjie,Wang, Yinghui,Zhou, Shangzhe,et al. Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs[J]. BIOGEOSCIENCES,2016.
APA	Xiao, Wenjie,Wang, Yinghui,Zhou, Shangzhe,Hu, Limin,Yang, Huan,&Xu, Yunping.(2016).Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs.BIOGEOSCIENCES.
MLA	Xiao, Wenjie,et al."Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs".BIOGEOSCIENCES (2016).