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Distribution of tetraether lipids in surface sediments of the northern South China Sea:Implications for TEX_(86) proxies

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文摘 Archaea have unique glycerol dialkyl glycerol tetraether(GDGT) lipids that can be used to develop paleotemperature proxies such as TEX_(86).This research is to validate proposed GDGT-proxies for paleotemperature determination in the South China Sea(SCS).Samples were collected from core-top sediments (0-5 cm) in the northern SCS.Total lipids were extracted to obtain core GDGTs,which were identified and quantified using liquid chromatography-mass spectrometry(LC-MS).The abundance of isoprenoidal GDGTs(/GDGTs) ranged from 271.5 ng/g dry sediment to 1266.3 ng/g dry sediment,whereas the branched GDGTs(bGDGTs),supposedly derived from terrestrial sources,ranged from 22.2 ng/g dry sediment to 56.7 ng/g dry sediment.The TEX_(86)-derived sea surface temperatures ranged from 20.9℃in the coast(water depth < 160 m) to 27.9℃offshore(water depth > 1000 m).TEX_(86)-derived temperatures near shore(< 160 m water depth) averaged 23.1±2.5℃(n =4),which were close to the satellite-derived winter mean sea surface temperature(average 22.6±1.0℃,n = 4);whereas the TEX_(86)-derived temperatures offshore averaged 27.4±0.3℃(n = 7) and were consistent with the satellite mean annual sea surface temperature(average 26.8±0.4℃,n = 7).These results suggest that TEX_(86) may record the sea surface mean annual temperature in the open ocean,while it likely records winter sea surface temperature in the shallower water.
来源 Geoscience Frontiers ,2013,4(2):223-229 【核心库】
DOI 10.1016/j.gsf.2012.10.002
关键词 Archaea ; GDGTs ; TEX_(86) ; Paleotemperature ; Northern South China Sea
地址

1. Tongji University, State Key Laboratory of Marine Geology, Shanghai, 200092  

2. China University of Petroleum(East China), State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology, Qingdao, 266580  

3. MARUM Center for Marine Environmental Sciences and Department of Geosciences,University of Bremen, Germany, Bremen, D-28334  

4. Guangzhou Institute of Geochemistry,Chinese Academy of Sciences, CAS Key Laboratory of Marginal Sea Geology, Guangzhou, 510640

语种 英文
文献类型 研究性论文
ISSN 1674-9871
学科 普通生物学
基金 supported by the South China Sea-Deep program of the National Science Foundation of China ;  the State Key Laboratory of Marine Geology of Tongji University ;  国家自然科学基金
文献收藏号 CSCD:4916685

参考文献 共 22 共2页

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引证文献 9 篇

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