Development of a technique of measuring CO flux using a semiconductor laser

• Project/Area Number: 16K12583
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Kyoto University
• Principal Investigator: Takahashi Kenshi 京都大学, 生存圏研究所, 准教授 (10303596)
• Co-Investigator(Kenkyū-buntansha): 植山 雅仁 大阪府立大学, 生命環境科学研究科, 准教授 (60508373)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: レーザー分光法 / 一酸化炭素 / フラックス

Outline of Final Research Achievements

A new technique for measuring atmospheric carbon monoxide (CO) flux near boundary layer has been developed, because CO is a major atmospheric pollutant in the urban atmosphere. Since the typical concentration of CO in the urban atmosphere is about several hundreds ppb and below, we utilized a semiconductor laser-based high-sensitive spectroscopy technique for in-situ and real-time detection of atmospheric CO. The laser spectrometer has been combined with a relaxed eddy accumulation (REA) equipment that has also been developed in this study, in which the REA approach is well-known as one of the major micrometeorological techniques for measuring the ecosystem CO2 flux. We made a performance test of our system by observations of urban air in Sakai, Osaka. This study has successfully revealed temporal variations of CO flux in the urban atmosphere.

Research Products

• [Journal Article] Exploring sub-daily to seasonal variations in methane exchange in a single-crop rice paddy in central Japan (2018)
  • Author(s): Iwata, H., M. Mano, K. Ono, T. Tokida, T. Kawazoe, Y. Kosugi, A. Sakabe, K. Takahashi, and A. Mityata
  • Journal Title: Atmospheric Environment Volume: 179 Pages: 156-165
  • DOI: 10.1016/j.atmosenv.2018.02.015
  • NAID: 120006540213
  • Peer Reviewed
• [Presentation] 実大気における連続観測を目的としたオープンパスレーザー分光メタン検出器の校正 (2016)
  • Author(s): 出原雅也 、秀森丈寛 、中山智喜 、松見豊、笹子宏史、川崎昌博、高橋けんし、林田佐智子、山本昭範、今須良一
  • Organizer: 日本気象学会秋季大会2016
  • Place of Presentation: 名古屋大学東山キャンパス
  • Year and Date: 2016-10-26
• [Presentation] Development of a low-cost in-situ methane observation system and results of field observation at a paddy field in India (2016)
  • Author(s): M. Izuhara, T. Hidemori, M. Kawasaki, T. Nakayama, Y. Matsumi, H. Sasago, Y. Terao, S. Nomura, T. Machida, W. Takeuchi, M. Adachi, R. Imasu, S. K. Dhaka, J. Singh, K. Takahashi
  • Organizer: 日本地球惑星連合大会2016
  • Place of Presentation: 千葉県千葉市幕張メッセ
  • Year and Date: 2016-05-22
• [Remarks] 京都大学生存圏研究所 大気圏環境情報分野 高橋グループ
  • URL: http://www.rish.kyoto-u.ac.jp/laeia/members/tkenshi/index.html