南海北部17937岩心四万年来古环境变化的分子有机地球化学记录

李丽; 王慧; 汪品先

南海北部17937岩心四万年来古环境变化的分子有机地球化学记录

同济大学海洋地质国家重点实验室, 上海 200092

基金项目:

国家自然科学基金项目 40403012

同济大学青年优秀人才培养行动基金 2006KJ055

国家重点基础研究发展计划 2007CB815904

国家自然科学基金委创新研究群体科学基金 40621063

详细信息

作者简介:
李丽(1974-), 女, 副教授, 从事海洋生物地球化学研究.E-mail: lilitju@mail.tongji.edu.cn

中图分类号: P532;P593
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出版历程
- 收稿日期: 2008-01-22
- 刊出日期: 2008-11-25

Molecular Organic Geochemical Record of Paleoenvironmental Changes of Core 17937 in Northern South China Sea Since 40 ka

State Key Laboratory of Marine Geology , Tongji University , Shanghai 200092, China

摘要

摘要: 以分子有机地球化学为手段对南海北部四万年来的古环境古气候研究表明, U₃₇^k’-SST表层水温在冰期、间冰期平均范围分别为27℃和24℃, LGM与全新世温差达4.5℃; 以高分子量烷烃所代表的陆源物质输入和长链不饱和酮化合物所代表的海洋初级生产力都呈现冰期高、间冰期低特征, 表明冰期时陆源物质输入的增加和海洋表层生产力的提高; 正构烷烃C₃₁/C₂₇记录了南方大陆的植被由冰期时草本植物占优势向间冰期时木本植物占优势的转变.说明南海在末次冰期以来气候的不稳定性, 和海陆生态系统对气候变化的响应以及分子有机地球化学在古环境古气候研究中的巨大潜力.
- 生物地球化学 /
- 生物标志化合物 /
- 南海 /
- 古气候
Abstract: Molecular organic geochemical analysis of Core 17937 in the northern South China Sea has provided useful information on the paleoenvironmental change in the 40 ka and revealed that the average surface temperature of U₃₇^k'-SSTs in glacial and interglacial is 27 ℃ and 24 ℃ respectively, resulting in a difference of 4.5 ℃ between Holocene and LGM.The terrestrial input, mainly consisting of high molecular weight alkanes and marine primary productivity, constituting long chain alkenones, both exhibited a high value in glacial and low value in interglacial, which suggests the supply of organic matter from the land is enhanced and the productivity in the ocean during glacial is increased.Alkane ratio of C₃₁/C₂₇ indicated that the predominant plants in South China changed from grass during glacial to tree during interglacial.All the results show the instability of climate since the last glacial in the SCS, and the significant role played by marine and terrestrial ecosystems in climate changes, as well as the potential of molecular organic geochemistry in paleoenvironment and paleoclimate studies.
- biogeochemistry /
- molecular biomarker /
- South China Sea /
- paleoclimate

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图 1 MD05-2901站位示意图

★代表本次研究站位; o代表文章中提及的南海相关站

Fig. 1. Sketch map showing location of core 17937

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图 2 17937岩心沉积物中性组分气相色谱图(以165 cm深度样品为例)

Fig. 2. Gas chromatography of neutral compounds in the core of 17937

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图 3 17937岩心浮游有孔虫G.ruber氧同位素曲线(a)和生物标志化合物变化曲线(b-e)

Fig. 3. Plot of δ¹⁸O of planktonic foraminifera G.ruber (a) and the molecular biomarkers in core 17937 (b-e)

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图 4 南海北部不同站位的表层水温记录对比(各站位位置见图 1)

Fig. 4. Comparisons of the SST record in northern South China Sea

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图 5 17937岩心正构烷烃C₃₁/C₂₇变化曲线与1144站孢粉含量的对比(Sun et al., 2003)

Fig. 5. Comparison of the alkane ratio of C₃₁/C₂₇ in 17937 and pollen percent in 1144

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