巢湖柱状沉积物中甘油二烷基甘油四醚脂(GDGTs)的组成特征
The composition and characteristics of glycerol dialkyl glycerol tetraethers(GDGTs) in core sediment from Lake Chaohu
查看参考文献27篇
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文摘
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甘油二烷基甘油四醚脂(GDGTs)是目前生物地球化学研究的热点之一.与GDGTs有关的指标已成功地应用在海洋环境中有关来源判识和古环境古气候重建的研究, 但是在湖泊环境中的应用目前还比较有限.通过开展巢湖柱状沉积物中GDGTs的组成测定, 为GDGTs类脂分子标志物在湖泊系统中的应用提供依据.研究表明由柱状沉积物中支链 GDGTs参数计算得到的量化结果与巢湖周围流域的环境温度、pH等历史记录能较好地吻合; 柱状沉积物中类异戊二烯类GDGTs来源的不确定性可能是造成TEX_(86)指标的量化结果和实际的水体温度出现较大偏差的重要原因.另外, 沉积物中GDGTs指标和TOC、C/N、δ~(13)C_(org)、δ~(15)N等传统湖泊总体有机质参数以及其它分子标志物指标相比, 具有高分辨性和抗干扰等特点.因此, 湖泊中GDGTs有望成为湖泊古气候和古环境重建的重要指标 |
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其他语种文摘
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Glycerol dialkyl glycerol tetraethers(GDGTs) is one of the recent hotspot in biogeochemical study. The proxies from GDGTs have been used successfully to reconstruct paleoenvironment and paleoclimate in many marine environments, however, its application in lacustrine environment is very limited. This study provided a valuable reference for the application of GDGTs in lake systems by analyzing the characteristics of GDGTs in core sediment from Lake Chaohu. Our study suggested that the quantification that was obtained by the proxies from branched GDGTs in core sediment from Lake Chaohu had a good agreement with the historical record including environmental temperature and pH in Chaohu basin. The quantification obtained by the proxies from isoprenoid GDGTs differed from the actual surface water temperature. It was possible that there are different source in sediment core. In addition, compared with the traditional parameters of total organic matter in lake such as TOC, C/N ratios, δ~(13) C_(org) and δ~(15)N values, the proxies from GDGTs had higher resolution and stronger jam proof ability. So GDGTs may be a significant proxy to reconstruct paleoenvironment and paleoclimate |
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来源
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湖泊科学
,2010,22(3):451-457 【核心库】
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关键词
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GDGTs
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古气候
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古环境
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湖泊沉积物
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巢湖
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地址
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1.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广州, 510640
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中国环境科学研究院, 国家环境保护湖泊污染控制重点实验室, 北京, 100012
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1003-5427 |
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学科
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自然地理学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家973计划
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国家自然科学基金项目
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中国环境科学院项目
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中国科学院有机地球化学国家重点实验室开放基金资助项目
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文献收藏号
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CSCD:3936459
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