STUDIES ON CLIMATIC CHANGE IN WESTERN DESERT AREAS IN CHINA AS DETERNINEDLONG CHAIN ALKENONE

以长链烯酮为依据的中国西部荒漠地区气候变化研究

• 批准号: 11640490
• 负责人: HANDA Nobuhiko
• 金额: $ 2.18万
• 依托单位: FACULTY OF INFORMATION SCIENCE AND TECHNOLOGY, AICHI PREFECTURAL UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640490/
• 关键词: Long-chain alkenone; unsaturate index; Saline lake sediment; Western Chinese desert; Paleoclimate change; Paleotemperature; Lacustrine microalgae; Hydrocarbon; (U^<k'>_<37>)

Aim of this work is two-fold 1) to identify long-chain alkenone in the saline lake sediments collected in the deep western desert area of China and 2) to clarify variability of lake water temperature after latest glacier maximum to present as calculated unsaturation index of long-chain alkenone which has been reported to exist in Coccolithophoride fossils of marine sediments.The saline lake sediments collected from Lake Aibi in Zhunger desert of the deep western China and analyzed for alkenones with carbon number of 37 to calculate unsaturation index of these compounds. Following results were obtained :・A series of long-chan alkenones with carbon numbers of 37,38 and 39 which have Several unsaturated C-C bonds were analyzed by retention time in gas Chromatography.・The long-chain alkenones were identified as di-, tri, tetra-unsaturated C_<37> alkenone by the combined gas chromatography-mass spectrometer. From the alkenone composition, we can calculated the unsaturate indices by which in situ temperature of lake water were determined as 4.8℃ by using of Sawada-Handa Equation in the Lake Aibi.・Several spices of coccolithophoride including Gephaerocapsa sp.were identified as phytoplankton producing long-chain alkenone by both microscopy and scanning electron microscopy.・These data strongly suggest that long-chain alkenone analyses must be promising tool to explore paleoclimate change in the deep wester desert areas of China.

本工作的目的是两方面的：1）鉴定中国西部沙漠地区盐湖沉积物中的长链烯酮; 2）阐明冰川最大期后湖水温度的变化，以计算长链烯酮的不饱和指数。链烯酮是一种已知存在于海洋沉积物中的颗石藻化石中的化合物并对37位碳原子的烯酮进行了分析，计算了这些化合物的不饱和指数。·用气相色谱保留时间法分析了一系列碳数为37、38和39的长链烯酮，这些化合物含有多个不饱和碳-碳键。经气相色谱-质谱联用仪鉴定，长链烯酮为二、三、四不饱和碳<37>烯酮。根据烯酮的组成，计算出各组分的温度指数，用Sawada-Handa方程确定了艾比湖湖水的温度为4.8℃。通过显微镜和扫描电子显微镜鉴定，包括Gephaerocapsa sp.在内的几种石球藻被鉴定为产生长链烯酮的浮游植物。这些数据表明，长链烯酮分析是探索中国西部沙漠地区古气候变化的有效工具。

项目成果

Harada,N.and N.Handa: "Alkenone records in sinking materials from the equatonal from the Equatorial Pacific"Deep-Sea Res.. 48. 891-907 (2001)

Harada, N. 和 N.Handa：“赤道太平洋赤道沉没物质中的烯酮记录”深海研究 48. 891-907 (2001)

Obayashi,Y.,E.Tanoue and N.Handa: "Dynamics of phytoplankton community structure in the northem North Pacific as determined by phytoplankton pigments"Deep-Sea Res.. 48. 439-469 (2001)

Obayashi,Y.,E.Tanoue 和 N.Handa：“由浮游植物色素确定的北太平洋浮游植物群落结构动态”深海研究 48. 439-469 (2001)

Sohrin,Y.,N.Handa,et al.: "The distribution of Fe in the Australian sector of the Souhtern Ocean"Deep-Sea Res.. 47. 55-84 (2000)

Sohrin,Y.,N.Handa,et al.:“南大洋澳大利亚部分铁的分布”Deep-Sea Res.. 47. 55-84 (2000)

Hayakawa,H.and N.Handa: "Vertical and horizontal fluxes of chemical materials in the Japan Trench area off Central Hobsyu Island of Japan"Dynamics and Characterization of Org.Matter. 105-116 (2000)

Hayakawa，H.和N.Handa：“日本中部Hobsyu岛附近的日本海沟地区化学物质的垂直和水平通量”有机物质的动态和特征。

Sawada, K., H.Okada, Y.Shiraiwa and N.Handa: "Productivity of Gephyrocapsacean algae revealed from long-chain alkenones and alkyl alkanoates"In the Northwestern Pacific. In : Dynamics and Characterization of Marine Organic Matter, Eds., N.Handa, E.Tanoue

Sawada, K.、H.Okada、Y.Shiraiwa 和​​ N.Handa：“从长链烯酮和链烷酸烷基酯中揭示的 Gephyrocapsacean 藻类的生产力”在西北太平洋。