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引用本文:吴敬禄,G.H.Schleser,夏威岚,Andreas Lucke,李世杰,王苏民.青藏高原东部兴措湖生物壳体元素及同位素记录的气候环境信息.湖泊科学,2001,13(3):220-226. DOI:10.18307/20010304
WU Jing lu,G.H.Schleser,XIA Weilan,Andreas Lucke,LI Shijie,WANG Suming.imatic Signals Recorded in Stable Isotope and Trace Elements of Shells in Xincuo Lake, Eastern Tibetan Plateau. J. Lake Sci.2001,13(3):220-226. DOI:10.18307/20010304
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青藏高原东部兴措湖生物壳体元素及同位素记录的气候环境信息
吴敬禄1, G.H.Schleser2, 夏威岚1, Andreas Lucke2, 李世杰1, 王苏民1
1.中国科学院南京地理与湖泊研究所, 南京 210008;2.Forschungszentrum Julich, D-52425 Julich, Germany
摘要:
通过对青藏高原东部若尔盖盆地兴措湖50年来Gyraulus sibirica壳体元素及同位素分析,并与器测气象资料的比较,建立了兴措湖记录与对应的降水和气温间的函数关系,探讨了湖泊记录所指示的气候环境意义.结果表明:青藏高原东部兴措湖地区腹足类生物在夏半年形成壳体,它所记录的是夏半年而不是全年的气候环境信息;Gyraulus sibirica壳体Mg/Ca比及δ18O指标与夏半年气温有一定的相关性,其中壳体δ18O指标对气温变化更敏感,δ18O与夏半年气温滑动平均间的变率为1.64‰/℃,均值比为0.28‰/℃;Sr/Ca比、δ13 C指标与夏半年的降水量关系较密切,尤其是Sr/Ca比随降水量波动呈显著相关变化,Sr/Ca变化与降水间的平均变率(d(Sr/Ca)/dP)为-0.045/mm.
关键词:  青藏高原  兴措湖  微量元素  同位素  气候信息
DOI:10.18307/20010304
分类号:
基金项目:国家自然科学基金(49803001);国家重点基础研究发展规划项目(G1998040800)联合资助项目
imatic Signals Recorded in Stable Isotope and Trace Elements of Shells in Xincuo Lake, Eastern Tibetan Plateau
WU Jing lu1, G.H.Schleser2, XIA Weilan1, Andreas Lucke2, LI Shijie1, WANG Suming1
1.Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China;2.Forschungszentrum Julich, D-52425 Julich, Germany
Abstract:
Here we displayed the results of trace elements and stable isotope in shell Gyraulus sibirica continuously preserved in the sediments of Xincuo Lake, Eastern Tibetan Plateau, in the past 50 years.By coupling these indexs and inst rumental meteorological data in its basin, we probed quantitatively modern climatic signals recorded in these indexes to build relat ive function relations.The results showed that gastropod shells in Xincuo Lake were formed in summer half year, so that trace elements, stable isotope in shells just recorded the climatic signals of the summer half year instead of those of the whole year, Mg/Ca ratio and δ18 O pro xy had a certain correlativity with summer half year air temperature, in which δ18O proxy was more sensitive with variability of δ18O to temperature d δ18O/dT 1.64‰/℃;As to Sr/Ca ratio and δ13C proxy, especially Sr/Ca ratio, there had a close correlation with summer half year precipi tation, in which the variability of Sr/Ca to precipitation d (Sr/Ca)/dP is -0.045/mm.
Key words:  Xincuo Lake  trace element  stable isotope  modern climate  Tibetan Plateau
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