AMS radiocarbon measurements of individual organic molecules : making preparative capillary GC system and its application to geochemical samples

单个有机分子的 AMS 放射性碳测量：制备型毛细管气相色谱系统及其在地球化学样品中的应用

• 批准号: 10354009
• 负责人: KAWAMURA Kimitaka
• 金额: $ 17.83万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10354009/
• 关键词: Radiocarbon; AMS; Chronology; Organic carbon age; Biomakers; Preparative GC; Aerosols; Geochemical samaples; 加速器質量分析計; 地球科学試料; 堆積物

Compound-specific radiocarbon analysis of individual fatty acids was conducted for a semi-urban aerosol sample using a preparative capillary gas chromatography (PCGC) system and an accelerator mass spectrometry (AMS). The aerosol fatty acids (C16 to C34) showed a typical bimodal distribution with two maxima at C16 and C26. Their carbon isotopic compositions ranged from -30.3 ‰ (C26) to -23.3 ‰ (C18), suggesting that they are derived from terrestrial higher plants and marine sources. Radiocarbon measurements of C16-C22 fatty acids showed modern 14C ages, suggesting that the acids are emitted from living higher plants and possibly from marineorganisms. On the other hand, C24-C26 fatty acids that arecharacteristic to terrestrial plant waxes showed 14C ages of 5860 (EA200) years. This suggests that some portion of higher molecular weight fatty acids have been stored in geocnemical reservoirs such as soils at least for hundreds to thousands of years arid then emitted to the atmosphere. These aged fatty acids could be in part transported long distances from the Asian continent through the atmosphere.

使用制备毛细管气相色谱（PCGC）系统和加速器质谱（AMS）对半城市气溶胶样品进行了单个脂肪酸的化合物特异性放射性碳分析。气溶胶脂肪酸（C16-C34）呈典型的双峰分布，在C16和C26处有两个最大值。它们的碳同位素组成介于-30.3 ‰（C26）~-23.3 ‰（C18）之间，表明它们既有陆生高等植物的来源，也有海洋来源。C16-C22脂肪酸的放射性碳测量显示现代14 C年龄，表明这些酸是从活的高等植物中排放出来的，也可能是从海洋生物中排放出来的。另一方面，C24-C26脂肪酸是陆生植物蜡的特征，其~（14）C年龄为5860（EA 200）年。这表明，一部分高分子量脂肪酸已经储存在地球化学水库，如土壤中至少数百至数千年，然后排放到大气中。这些老化的脂肪酸可以通过大气从亚洲大陆长途运输。

项目成果

T.Saito et al.: "Stable carbon isotopic compositionS of light hydrocarbons over the western North Pacific and implication for their photochemical ages"Journal of Geophysical Research. (印刷中).

T. Saito 等人：“北太平洋西部轻质烃的稳定碳同位素组成及其光化学年龄的含义”地球物理研究杂志（正在出版）。

K.Kawamura: "Molecular distributions of water soluble dicarboxylic acids in marine aerosols over the Pacific Ocean including tropics" J.Geophys.Res.104. 3501-3509 (1999)

K.Kawamura：“太平洋（包括热带地区）海洋气溶胶中水溶性二羧酸的分子分布”J.Geophys.Res.104。

K.Kawamura: "Distributions of low molecular weight dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls in Greenland ice core : A trend from Little Ice A ge to the present (1540 to 1989 A.D.)."Journal of Geophysical Research. 106. 1331-1345 (2001)

K. Kawamura：“格陵兰冰芯中低分子量二羧酸、含氧羧酸和 α-二羰基的分布：从小冰时代到现在（公元 1540 年至 1989 年）的趋势。”地球物理研究杂志 106。1331。 -1345 (2001)

T. Saito, U. Tsunogai, K. Kawamura, T. Nakatsuka, N. Yoshida: "Stable carbon isotopic compositions of light hydrocarbons; over the western North Pacific and implication for their photochemical ages"Journal of Geophysical Research. (in press).

T. Saito、U. Tsunogai、K. Kawamura、T. Nakatsuka、N. Yoshida：“轻质烃的稳定碳同位素组成；北太平洋西部及其光化学年龄的含义”地球物理研究杂志。

K.Kawamura: "Implication of azelaic acid in a Greenland ice core for oceanic and atmospheric change in high latitudes"Geophysical Research Letter. 26. 871-874 (1999)

K.Kawamura：“格陵兰冰芯中壬二酸对高纬度地区海洋和大气变化的影响”地球物理研究快报。