Ubiquitous production of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in global marine environments: a new source indicator for brGDGTs | |
Xiao, Wenjie1,2; Wang, Yinghui2; Zhou, Shangzhe2; Hu, Limin3; Yang, Huan4; Xu, Yunping1,2 | |
刊名 | BIOGEOSCIENCES |
2016-10-28 | |
卷号 | 13期号:20页码:5883-5894 |
ISSN号 | 1726-4170 |
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. |
资助项目 | National Science Foundation of China[41476062] |
WOS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 |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
语种 | 英语 |
出版者 | COPERNICUS GESELLSCHAFT MBH |
WOS记录号 | WOS:000386492800001 |
内容类型 | 期刊论文 |
源URL | [http://ir.fio.com.cn:8080/handle/2SI8HI0U/25402] |
专题 | 自然资源部第一海洋研究所 |
通讯作者 | Xu, Yunping |
作者单位 | 1.Shanghai Ocean Univ, Coll Marine Sci, Shanghai Engn Res Ctr Hadal Sci & Technol, Shanghai 201306, Peoples R China 2.Peking Univ, Coll Urban & Environm Sci, MOE Key Lab Earth Surface Proc, Beijing 100871, Peoples R China 3.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China 4.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China |
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,2016,13(20):5883-5894. |
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,13(20),5883-5894. |
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 13.20(2016):5883-5894. |
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