Studies on long-term variations of the isoprene distribution in the troposphere and its effects on air quality using infrared spectroscopy

• Project/Area Number: 21H03589
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 63010:Environmental dynamic analysis-related
• Research Institution: Nagoya University
• Principal Investigator: Nagahama Tomoo 名古屋大学, 宇宙地球環境研究所, 准教授 (70377779)
• Co-Investigator(Kenkyū-buntansha): 村田 功 東北大学, 環境科学研究科, 准教授 (00291245) ; 森野 勇 国立研究開発法人国立環境研究所, 地球システム領域, 室長 (90321827)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2023: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000); Fiscal Year 2021: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
• Keywords: イソプレン / 赤外分光法 / 対流圏オゾン / 大気汚染物質 / 長期変動 / リトリーバル解析

Outline of Research at the Start

都市域とその周辺において大気汚染物質の増加による大気質の低下は住民の健康影響を引き起こす。そのため、それらを抑制し、大気質を保全することは今日的な課題である。
なかでも、イソプレンは大気中の酸化過程により、対流圏オゾン等の大気汚染物質を生成する。本研究では大気中のイソプレン濃度を太陽光赤外吸収スペクトル観測データから解析する手法を確立し、対流圏オゾン等の大気汚染物質と併せて上空のイソプレン濃度の過去20年間以上にわたる長期動態を世界で初めて観測的に明らかにする。さらにイソプレンと大気汚染物質の濃度変動の関係とその要因を化学輸送モデルも活用して解明し、大気質の評価と将来予測の精緻化等に貢献する。

Outline of Final Research Achievements

We developed a novel method to analyze isoprene concentration, which accounts for 1/3 of volatile organic compounds in the atmosphere, from solar absorption spectrum observations by infrared spectroscopy. We also analyzed the concentration of isoprene and air pollutants in the atmosphere from over 15 years of observation data to elucidate their relationship and factors. We determined the isoprene column amount from absorption spectrum observation data in the 11-μm wavelength band by retrieval analysis and newly discovered seasonal variations, long-term trends, and sudden increase phenomena. Moreover, correlation analysis of isoprene and formaldehyde produced by its oxidation revealed that the isoprene lifetime was 5-10 times longer than usual during the sudden increase.

Academic Significance and Societal Importance of the Research Achievements

本研究により、赤外分光観測データからイソプレンカラム量の解析手法が初めて確立できた。これにより国際観測ネットワークとして世界20か所以上で行われている高分解能赤外分光計を用いた太陽光吸収スペクトル観測データから、長期にわたるイソプレンカラム量の時間変動を得ることが可能となった。赤外域にはイソプレンだけでなく大気汚染に関連する微量分子のスペクトルが多数存在するため、世界各地でイソプレンと大気汚染物質の長期にわたる動態を同時に把握することが可能となり、イソプレンから大気汚染物質への変質量について定量的な理解と全球の大気質評価と将来予測の精緻化に貢献できる。

Research Products

• [Int'l Joint Research] National Center for Atmospheric Research/Jet Propulsion Laboratory(米国)
• [Int'l Joint Research] BIRA-IASB(ベルギー)
• [Int'l Joint Research] Chinese Academy of Sciences(中国)
• [Int'l Joint Research] University of Wollongong(オーストラリア)
• [Int'l Joint Research] National Center for Atmospheric Research/Jet Propulsion Laboratory(米国)
• [Int'l Joint Research] BIRA-IASB(ベルギー)
• [Int'l Joint Research] National Center for Atmospheric Research/Jet Propulsion Laboratory(米国)
• [Int'l Joint Research] BIRA-IASB(ベルギー)
• [Journal Article] Bias correction of OMI HCHO columns based on FTIR and aircraft measurements and impact on top-down emission estimates (2024)
  • Author(s): Muller, J.-F., Stavrakou, T., Oomen, G.-M., Opacka, B., De Smedt, I., Guenther, A., Vigouroux, C., Langerock, B., Aquino, C. A. B., Grutter, M., Hannigan, J., Hase, F., Kivi, R., Lutsch, E., Mahieu, E., Makarova, M., Metzger, J.-M., Morino, I., Murata, I., Nagahama, T., Notholt, J., Ortega, I., Palm, M., et al.
  • Journal Title: Atmospheric Chemistry and Physics Volume: 24 Issue: 4 Pages: 2207-2237
  • DOI: 10.5194/acp-24-2207-2024
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Validation of OMPS Suomi NPP and OMPS NOAA‐20 Formaldehyde Total Columns With NDACC FTIR Observations (2023)
  • Author(s): H.-A. Kwon, G. Gonzalez Abad, C. R. Nowlan, H. Chong, A. H. Souri, C. Vigouroux, A. Rohling, R. Kivi, M. Makarova, J. Notholt, M. Palm, H. Winkler, Y. Te, R. Sussmann, M. Rettinger, E. Mahieu, K. Strong, E. Lutsch, S. Yamanouchi, T. Nagahama, J. W. Hannigan, M. Zhou, I. Murata, M. Grutter, et al. (I. Morino)
  • Journal Title: Earth and Space Science Volume: 10 Issue: 5
  • DOI: 10.1029/2022ea002778
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Anomalies of O3, CO, C2H2, H2CO, and C2H6 detected with multiple ground-based Fourier-transform infrared spectrometers and assessed with model simulation in 2020: COVID-19 lockdowns versus natural variability (2023)
  • Author(s): Ortega Ivan, Gaubert Benjamin, Hannigan James W., Brasseur Guy, Worden Helen M., Blumenstock Thomas, Fu Hao, Hase Frank, Jeseck Pascal, Jones Nicholas, Liu Cheng, Mahieu Emmanuel, Morino Isamu, Murata Isao, Notholt Justus, Palm Mathias, Rohling Amelie, Te Yao, Strong Kimberly, Sun Youwen, Yamanouchi Shoma
  • Journal Title: Elem Sci Anth Volume: 11 Issue: 1
  • DOI: 10.1525/elementa.2023.00015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Long-range transport of CO and aerosols from Siberian biomass burning over northern Japan during 18?20 May 2016 (2023)
  • Author(s): Ngoc Trieu Tran Thi、Morino Isamu、Uchino Osamu、Tsutsumi Yukitomo、Izumi Toshiharu、Sakai Tetsu、Shibata Takashi、Ohyama Hirofumi、Nagahama Tomoo
  • Journal Title: Environmental Pollution Volume: 322 Pages: 121129-121129
  • DOI: 10.1016/j.envpol.2023.121129
  • Peer Reviewed / Open Access
• [Journal Article] Nitrous Oxide Profiling from Infrared Radiances (NOPIR): Algorithm Description, Application to 10 Years of IASI Observations and Quality Assessment (2022)
  • Author(s): Vandenbussche Sophie、et al. (Morino Isamu、Nagahama Tomoo)
  • Journal Title: Remote Sensing Volume: 14 Issue: 8 Pages: 1810-1810
  • DOI: 10.3390/rs14081810
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Global Atmospheric OCS Trend Analysis From 22 NDACC Stations (2022)
  • Author(s): Hannigan James W.、et al. (Morino Isamu, Murata Isao, Nagahama Tomoo)
  • Journal Title: Journal of Geophysical Research: Atmospheres Volume: 127 Issue: 4 Pages: 1-28
  • DOI: 10.1029/2021jd035764
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] First ground-based Fourier transform infrared (FTIR) spectrometer observations of HFC-23 at Rikubetsu, Japan, and Syowa Station, Antarctica (2021)
  • Author(s): Takeda Masanori、Nakajima Hideaki、Murata Isao、Nagahama Tomoo、Morino Isamu、Toon Geoffrey C.、Weiss Ray F.、Muhle Jens、Krummel Paul B.、Fraser Paul J.、Wang Hsiang-Jui
  • Journal Title: Atmospheric Measurement Techniques Volume: 14 Issue: 9 Pages: 5955-5976
  • DOI: 10.5194/amt-14-5955-2021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Validation of methane and carbon monoxide from Sentinel-5 Precursor using TCCON and NDACC-IRWG stations (2021)
  • Author(s): Sha Mahesh Kumar、et al., (Morino Isamu、Nagahama Tomoo)
  • Journal Title: Atmospheric Measurement Techniques Volume: 14 Issue: 9 Pages: 6249-6304
  • DOI: 10.5194/amt-14-6249-2021
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] A study of interannual variation of ozone and other minor constituents in the stratosphere using digital filters (2023)
  • Author(s): Tianliang Yang, Tomoo Nagahama, Tac Nakajima
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] 名古屋に設置された高分解能FTIR装置による都市域大気組成モニタリング観測 (2023)
  • Author(s): 長濵智生、水野亮、中島拓、村田功、森野勇
  • Organizer: 日本地球惑星科学連合2023年大会
• [Presentation] A new urban observation site in Nagoya, Japan (2023)
  • Author(s): Tomoo Nagahama, Akira Mizuno, Tac Nakajima, Isao Murata, Isamu Morino, Hideaki Nakajima
  • Organizer: NDACC/IRWG-TCCON-COCCON Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Long-term variation of isoprene column amount measured with high-resolution FTIR at Rikubetsu, Japan (2023)
  • Author(s): Tomoo Nagahama, Isao Murata, Isamu Morino
  • Organizer: NDACC/IRWG-TCCON-COCCON Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Retrieval of methane isotopes at 3 and 8 micron regions from the spectra observed at Tsukuba, Japan (2023)
  • Author(s): I. Murata, T. Nagahama, H. Nakajima, I. Morino
  • Organizer: NDACC/IRWG-TCCON-COCCON Annual Meeting 2023
  • Int'l Joint Research
• [Presentation] Aura/MLS 衛星データによる日食時の中高層大気微量分子応答の統計解析 (2023)
  • Author(s): Tianliang Yang, Tomoo Nagahama, Taku Nakajima, Akira Mizuno
  • Organizer: 地球電磁気・地球惑星圏学会2023年秋季年会
• [Presentation] 高分解能FTIR観測よる陸別上空のHCFC-22、HFC-23カラム量の再解析 (2023)
  • Author(s): 杉本一郎, 長濱智生, 森野勇
  • Organizer: 第28回大気化学討論会
• [Presentation] 高分解能FTIRによるイソプレンカラム量解析と時間変動 (2023)
  • Author(s): 長浜智生、森野勇、村田功
  • Organizer: 第28回大気化学討論会
• [Presentation] つくばFTIR観測で捉えたHCFC-22の減少 (2023)
  • Author(s): 村田功、長濱智生、森野 勇、中島英彰
  • Organizer: 第28回大気化学討論会
• [Presentation] Characteristics of the Digital Filter Method for the Analyses of Long-term Variations of Stratospheric Ozone and Other Species with AURA/MLS Satellite Data (2022)
  • Author(s): 楊天量、長浜智生、中島拓
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] Description of the NIES FTIR observing system at Tsukuba, Japan: candidate for qualification as NDACC instrument (2022)
  • Author(s): I. Murata, I. Morino, H. Nakajima
  • Organizer: TCCON/COCCON/NDACC 2022 Joint Meeting
  • Int'l Joint Research
• [Presentation] FTIR観測によるメタン同位体導出 (2022)
  • Author(s): 村田功、長浜智生、中島英彰、森野勇
  • Organizer: 第27回大気化学討論会
• [Presentation] 陸別高分解能FTIRによるイソプレンカラム量の長期変動解析 (2022)
  • Author(s): 長濱智生, 村田功, 森野勇
  • Organizer: 日本地球惑星科学連合2022年大会
• [Presentation] 地上高分解能FTIRによる太陽光吸収スペクトルからのイソプレンカラム量解析手法の研究 (2021)
  • Author(s): 長濱智生, 森野勇, 村田功
  • Organizer: 第26回大気化学討論会
• [Remarks] 大気圏環境変動研究室
  • URL: https://skx1.isee.nagoya-u.ac.jp/
• [Remarks] 名古屋大学宇宙地球環境研究所
  • URL: https://www.isee.nagoya-u.ac.jp/