期刊
ORGANIC GEOCHEMISTRY
卷 89-90, 期 -, 页码 31-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2015.10.004
关键词
Hydroxylated isoprenoidal GDGTs; Past sea surface temperature; Chinese coastal seas
资金
- National Natural Science Foundation of China [41376090]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA11020102]
- Research Fund for the Doctoral Program of Higher Education of China [20120145120017]
- Marine Safeguard Project [GZH201200503]
- Gottfried Wilhelm Leibniz Program of the Deutsche Forschungsgemeinschaft [HI 616-14]
Hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers (OH-GDGTs), with one or two hydroxyl groups in one of the biphytanyl moieties, are major compounds in planktonic Thaumarchaeota, and occur widely in marine and lacustrine sediments. In order to examine their potential as an indicator of local variation in sea surface temperature (SST), we collected 70 surface sediments from the Chinese coastal seas (CCSs), including 16 from the Yangtze Estuary, to determine their tetraether lipid composition. The proportion of OH-GDGTs relative to total isoprenoid GDGTs increased with latitude from 1.8% to 12.8% and correlated strongly with SST, as indicated from redundancy analysis. The variation in OH-GDGT composition was best captured by the weighted average number of cyclopentane moieties in OH-GDGT-1 and -2 (RI-OH), which correlated significantly with both summer and autumn SST and was associated with minimum residual SST relative to remote sensing data. The large input of terrigenous organic matter to the Yangtze Estuary appears to have no significant influence on the OH-GDGT based proxy. Our study suggests that RI-OH could serve as a useful proxy for recording warm seasonal SST in the CCSs. A global surface sediment compilation further indicates that RI-OH and its derivative, RI-OH', which additionally contains OH-GDGT-0, may be used to estimate SST in warm (ca. > 15 degrees C annual mean SST) and cold (ca. < 15 degrees C) environments, respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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