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Elucidation of Carbonyl Sulfide missing source and global budget by application of sulfur isotopes

Research Project

Project/Area Number 20H01975
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionSophia University

Principal Investigator

Danielache Sebastian  上智大学, 理工学部, 准教授 (00595754)

Co-Investigator(Kenkyū-buntansha) 亀崎 和輝  国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 研究員 (00910142)
服部 祥平  東京工業大学, 物質理工学院, 研究員 (70700152)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2020: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Keywords硫黄同位体 / 硫化カルボニル / 大気化学モデリング / 人為起源 / 人為活動 / 硫黄同位体比
Outline of Research at the Start

硫化カルボニル(COS)は成層圏硫酸エアロゾルによる地球の冷却効果の一因となる他、炭素収支の定量的見積もりの間接指標となる。しかし、COSの生成源のうち70%以上の起源が不明と指摘され、過去から将来にわたる成層圏硫酸エアロゾル量の推定や、COSを用いた一次生産量の評価を困難にしている。そこで本研究では、数値モデリング手法に基づく大気硫黄循環の解析に、COSの起源を区別できる硫黄安定同位体組成情報を組み合わせて、COSミッシングソースを特定し、全球COS収支を解明する。また、全球COS動態モデルを構築することで、人間活動の変化が対流圏COS動態・成層圏硫酸エアロゾル量を通じて気候変動に与える影響を評価・予測する。

Outline of Final Research Achievements

In FY2022, the COS concentration measuring device (MIRAPico) was adjusted to enable atmospheric observations. Long-term observations were conducted at the forest site and Tsukuba. However, the mirror surface required cleaning because there was a phenomenon that the instrument became unstable due to contamination of the mirror surface. After maintenance, the obtained results were calibrated. We are now preparing to publish a paper summarizing the results of our observations.
The oxidation process of carbon disulfide (CS2), which is the origin of COS, was studied using a 1D model. As a result, it was clarified that UV-A ultraviolet light causes photoexcitation reaction of CS2 in the lower troposphere, and the oxidation process from CS2 to OCS, which has not been considered in model studies, has been submitted to JGR (Atmosphere) in the form of a paper, which is currently under review.

Academic Significance and Societal Importance of the Research Achievements

最も不確実性の高い日本付近においてCOS濃度と硫黄同位体比の観測を実施し、日本がCOS濃度のホットスポットである原因が人為由来である他、COS濃度の連続測定を可能とすることで、短期的なCOS変動要因の解析を行なった。今後モデルシュミレーションに加える際の境界条件として用いることができる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (11 results)

All 2022 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (10 results) (of which Int'l Joint Research: 10 results)

  • [Journal Article] Constraining the atmospheric OCS budget from sulfur isotopes2020

    • Author(s)
      Hattori Shohei、Kamezaki Kazuki、Yoshida Naohiro
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 117 Issue: 34 Pages: 20447-20452

    • DOI

      10.1073/pnas.2007260117

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 理論計算を用いたOCS+O(1D)反応の反応機構と速度定数2022

    • Author(s)
      冬月 世馬、原昂汰
    • Organizer
      日本地球化学会第68回年会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Model Study on Carbon Disulfide Oxidation Mechanism2022

    • Author(s)
      Yuanzhe Li, Fuyutsuki Seba
    • Organizer
      第26回大気化学討論会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Continuous carbonyl sulfide concentration measurement using a portable mid-infrared laser spectrometer2022

    • Author(s)
      Kazuki Kamezaki, Sebastian Danielache, Shigeyuki Ishidoya, Shohei Murayama, Takahisa Maeda, Hiroyuki Muraoka
    • Organizer
      Japan Geoscience Union Meeting 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Modelling the tropospheric and stratospheric sulfur isotopes in a column model for volcanically quiescent periods2021

    • Author(s)
      Juhi Nagori, Narcisa Nechita-Banda, Masumi Shinkai, Sebastian Danielache, Thomas Rockmann, Maarten Krol
    • Organizer
      EGU General Assembly Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Photochemistry of tropospheric CS2, a new chemical pathway2021

    • Author(s)
      Yuanzhe Li, Kazuki Kamezaki, Sebastian Danielache
    • Organizer
      EGU General Assembly Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 一次元光化学モデルを用いた二硫化炭素の動態解析2020

    • Author(s)
      亀崎和輝、Li Yuanzhe、Danielache Sebastian
    • Organizer
      第25回大気化学討論会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 硫化カルボニルの硫黄同位体分析とその応用-ミッシングソースの特定と全球収支解明2020

    • Author(s)
      服部祥平、亀崎和輝、吉田尚弘
    • Organizer
      第25回大気化学討論会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 硫黄同位体比を用いた硫化カルボニルのミッシングソース特定と全球収支解明2020

    • Author(s)
      服部祥平、亀崎和輝、吉田尚弘
    • Organizer
      第25回大気化学討論会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Revision of Tropospheric CS2 Chemistry2020

    • Author(s)
      Li Yuanzhe、亀崎和輝、Danielache Sebastian
    • Organizer
      日本地球化学会 第67回オンライン年会
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Isotopic constraints on the atmospheric carbonyl sulfide (OCS or COS) budget2020

    • Author(s)
      Shohei Hattori, Kazuki Kamezaki, Naohiro Yoshida
    • Organizer
      AGU 2020 fall meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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