High-time resolution measurements of atmospheric methane by use of cavity enhanced absorption spectroscopy

利用腔增强吸收光谱法对大气甲烷进行高时间分辨率测量

• 批准号: 21710009
• 负责人: TAKAHASHI Kenshi
• 金额: $ 3万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21710009/
• 关键词: キャビティ増幅吸収分光法; 超高感度分析; 迅速分析; レーザー; メタン; 半導体レーザー; 積分型吸収分光法

A laser-based instrument using a technique of cavity enhanced absorption spectroscopy (CEAS) was developed to measure atmospheric methane accurately and precisely. The limit-of-detection of the developed instrument achieved 1 ppb for 1 second signal averaging, which is enough high to detect atmospheric methane on a real-time basis. The instrument was utilized in a Japanese cypress forest in Shiga prefecture, Japan, to investigate the spatio-temporal behavior of methane above and within the forest canopy. An automated chamber measurement system was coupled to the laser-based instrument developed in this study, thereby methane exchange fluxes between the foliage, trunk, and forest soils and the atmosphere were calculated. The chamber fluxes were obtained with 15-min time resolution.

为了准确测量大气中的甲烷浓度，研制了一种基于激光的腔增强吸收光谱（CEAS）技术的大气甲烷浓度测量仪。所开发的仪器的检测限达到1 ppb的1秒信号平均，这是足够高的实时检测大气甲烷。该仪器在日本滋贺县的日本柏树林中使用，以调查森林树冠上方和内部甲烷的时空行为。一个自动室测量系统耦合到激光为基础的仪器在这项研究中开发的，从而叶片，树干，森林土壤和大气之间的甲烷交换通量进行了计算。室通量获得15分钟的时间分辨率。

项目成果

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Kinetics of the reaction of chlorine atoms with isoprene (2-methyl 1,3-butadiene, CH2C(CH3)CHCH2) at 297 ± 2 K

• DOI: 10.1016/j.cplett.2009.03.002
• 发表时间: 2009-04
• 期刊: Chemical Physics Letters
• 影响因子: 2.8
• 作者: J. Xing;Kenshi Takahashi;M. D. Hurley;T. Wallington

Kinetics of the reactions of chlorine atoms with a series of acetates at 296K

296K 下氯原子与一系列乙酸酯反应的动力学

• 发表时间: 2009
• 期刊: Chem.Phys.Lett. 474
• 作者: J.-H.Xing;K.Takahashi;M.D.Hurley;T.J.Wallington
• 通讯作者: T.J.Wallington

OH-initiated oxidation of small unsaturated alcohols

OH引发的小分子不饱和醇的氧化

• 发表时间: 2010
• 期刊: Int.J.Chem.Kinet. 42
• 作者: K.Takahashi;M.D.Hurley;T.J.Wallington
• 通讯作者: T.J.Wallington

Field application of near-infrared laser spectroscopy : Trace gas exchange between the atmosphere and biosphere

近红外激光光谱的现场应用：大气与生物圈之间的微量气体交换

• 发表时间: 2009
• 作者: 藤井理行;ほか;Kenshi Takahashi
• 通讯作者: Kenshi Takahashi