Nitrogen isotopomer modeling for prediction of N2O emission form the ocean

• Project/Area Number: 15H05471
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Cosmochemistry
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: YOSHIKAWA Chisato 国立研究開発法人海洋研究開発機構, 生物地球化学研究分野, 技術研究員 (40435839)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥23,270,000 (Direct Cost: ¥17,900,000、Indirect Cost: ¥5,370,000); Fiscal Year 2018: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2017: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2016: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2015: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
• Keywords: 地球化学 / 一酸化二窒素 / 海洋生態系モデル / 同位体分子種 / 生物地球化学

Outline of Final Research Achievements

In this study, we developed a marine ecosystem and isotopomer coupled model to estimate an accurate flux of marine N2O emission. We applied our 1D model to the subtropical station (S1) and the subarctic station (K2) in the western North Pacific. We compared the results with our isotopic observation, estimated annual N2O emissions at stations S1 and K2 and revealed emission processes. Moreover, we developed global model and achieved global isotopic distributions compatible with observation.

Academic Significance and Societal Importance of the Research Achievements

N2Oは、自身が主要な温室効果ガスであるとともに、成層圏に輸送されると光酸化反応を経てオゾン層の破壊に関与する。このことから、N2Oの収支や変動要因の理解は、地球温暖化対策やオゾン層保護において重要な研究課題であると考えられている。しかし、N2Oの総排出量の見積もり幅はまだ極めて大きく、各排出起源の見積もりの高精度化が求められている。海洋は重要な排出源であるが、未だ大きな見積もり幅を持つ。本研究では、同位体分子種を用いることで、N2O生成プロセスを陽に扱ったモデルを開発した。

Research Products

• [Journal Article] Nitrate isotope distributions in the subarctic and subtropical North Pacific. (2018)
  • Author(s): Yoshikawa, C., Makabe, A., Matsui, Y., Nunoura, T., and Ohkouchi, N.
  • Journal Title: Geochemistry Geophysics Geosystems Volume: 19 Issue: 7 Pages: 2212-2224
  • DOI: 10.1029/2018gc007528
  • Peer Reviewed / Open Access
• [Journal Article] Hadal water biogeochemistry over the Izu-Ogasawara Trench observed with a full-depth CTD-CMS (2018)
  • Author(s): Kawagucci Shinsuke、Makabe Akiko、Kodama Taketoshi、Matsui Yohei、Yoshikawa Chisato、Ono Etsuro、Wakita Masahide、Nunoura Takuro、Uchida Hiroshi、Yokokawa Taichi
  • Journal Title: Ocean Science Discussions Volume: 14 Pages: 575-588
  • DOI: 10.5194/os-2018-37
• [Journal Article] Comparison of carbon cycle between the western Pacific subarctic and subtropical time-series stations: highlights of the K2S1 project (2017)
  • Author(s): Honda Makio C.、Wakita M.、Matsumoto K.、Fujiki T.、Siswanto E.、Sasaoka K.、Kawakami H.、Mino Y.、Sukigara C.、Kitamura M.、Sasai Y.、Smith S. L.、Hashioka T.、Yoshikawa C.、Kimoto K.、Watanabe S.、Kobari T.、Nagata T.、Hamasaki K.、Kaneko R.、Uchimiya M.、Fukuda H.、Abe O.、Saino T.
  • Journal Title: Journal of Oceanography Volume: 73 Issue: 5 Pages: 647-667
  • DOI: 10.1007/s10872-017-0423-3
  • NAID: 40021355565
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Basin-scale distribution of NH4+ and NO2- in the Pacific Ocean (2017)
  • Author(s): Yasunaka Sayaka、Nojiri Yukihiro、Hashioka Taketo、Yoshikawa Chisato、Kodama Taketoshi、Nakaoka Shin-ichiro、Chiba Sanae、Hashihama Fuminori、Wakita Masahide、Furuya Ken、Sasano Daisuke、Murata Akihiko、Uchida Hiroshi、Aoyama Michio
  • Journal Title: Journal of Oceanography Volume: 74 Issue: 1 Pages: 1-11
  • DOI: 10.1007/s10872-017-0433-1
  • Peer Reviewed / Open Access
• [Journal Article] 海から放出される一酸化二窒素 (2016)
  • Author(s): 吉川 知里
  • Journal Title: 化学と教育 Volume: 64 Pages: 178-179
  • NAID: 130005434000
• [Journal Article] 海洋N2O排出量の推定を目的とした海洋低次生態系-同位体分子種モデルの開発 (2016)
  • Author(s): 吉川 知里, 阿部 瞳, 相田 真希, 小川 奈々子, 菅 寿美, 大河内 直彦, 脇田 昌英, 本多 牧生, 豊田 栄, 吉田 尚弘
  • Journal Title: 月刊海洋 Volume: 48 Pages: 302-308
• [Journal Article] Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model (2015)
  • Author(s): Chisato Yoshikawa, Hitomi Abe, Maki N. Aita, Florian Breider, Keichi Kuzunuki, Sakae Toyoda, Nanako O. Ogawa, Hisami Suga, Naohiko Ohkouchi, Sebastian O. Danielache, Masahide Wakita, Makio C. Honda, Naohiro Yoshida
  • Journal Title: Journal of Oceanography Volume: - Issue: 3 Pages: 1-18
  • DOI: 10.1007/s10872-015-0308-2
  • NAID: 130005492400
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Origin and fluxes of nitrous oxide along a latitudinal transect in 4 western North Pacific: controls and regional significance (2015)
  • Author(s): Florian Breider, Chisato Yoshikawa, Hitomi Abe, Sakae Toyoda, Naohiro Yoshida
  • Journal Title: Global Biogeochemical Cycles Volume: 29 Issue: 7 Pages: 1014-1027
  • DOI: 10.1002/2014gb004977
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Nitrate isotope distributions in the subarctic and subtropical North Pacific (2018)
  • Author(s): Chisato Yoshikawa, Akiko Makabe, Yohei Matsui, Takuro Nunoura, Naohiko Ohkouchi
  • Organizer: 日本地球惑星科学連合 2018年大会
  • Int'l Joint Research
• [Presentation] 海洋窒素同位体モデルで窒素同位体比の季節変化の海域特性を明らかにする (2018)
  • Author(s): 吉川知里、重光雅仁、山本彬友、岡顕、大河内直彦
  • Organizer: 2018年度 日本地球化学会年会
• [Presentation] Nitrate isotope distributions in the eastern Indian Ocean (2018)
  • Author(s): 吉川 知里、眞壁 明子、松井 洋平、布浦 拓郎、大河内 直彦
  • Organizer: 日本地球惑星科学連合 2018年大会
  • Int'l Joint Research
• [Presentation] Nitrogen isotopic ratios of phytoplankton in the western subtropical North Pacific (2018)
  • Author(s): Chisato Yoshikawa, Haruyo Yamaguchi, Nanako O. Ogawa, Akiko Makabe, Yohei Matsui,
  • Organizer: 2018 Ocean Science Meeting
  • Int'l Joint Research
• [Presentation] Nitrogen isotope ratios of sinking particles record autumn progress of nitrification (2017)
  • Author(s): Yoshikawa C, Ogawa NO, Chikaraishi Y, Makabe A, Matsui Y, Kawagucci S, Sasai Y, Aita M. N, Wakita M, Honda M. C, Fujiki T, Harada N, Ohkouchi N
  • Organizer: ASLO 2017 Aquatic Sciences Meeting
  • Place of Presentation: Hawaii Convention Center, Honolulu, USA
  • Year and Date: 2017-03-01
  • Int'l Joint Research
• [Presentation] Development of a model of nitrous oxide in the western North Pacific (2017)
  • Author(s): Chisato Yoshikawa, Yoshikazu Sasai, Akiko Makabe, Florian Breider, Sakae Toyoda, Yohei
  • Organizer: JpGU-AGU Joint Meeting 2017
  • Int'l Joint Research
• [Presentation] Seasonal Variations in Nitrogen Isotope Ratios of Amino Acid of Settling Particles in the Western Subarctic North Pacific (2016)
  • Author(s): Yoshikawa C, Ogawa N, Chikaraishi Y, Fujiki T, Harada N, Honda M & Ohkouchi N
  • Organizer: Goldschmidt 2016
  • Place of Presentation: パシフィコ横浜、神奈川県横浜市
  • Year and Date: 2016-06-28
  • Int'l Joint Research
• [Presentation] Development of a marine ecosystem model including nitrite (2016)
  • Author(s): Chisato Yoshikawa, Yoshikazu Sasai, S. Lan Smith, Akiko Makabe, Takuro Nunoura, Masahide Wakita, Makio Honda
  • Organizer: Japan Geoscience Union Meeting (JpGU 2016)
  • Place of Presentation: 幕張メッセ、千葉県千葉市
  • Year and Date: 2016-05-23
• [Presentation] Surface nitrogen cycle in the western subarctic North Pacific revealed by nitrogen isotope ratios of amino acid of settling particle (2016)
  • Author(s): Chisato Yoshikawa, Nanako O. Ogawa, Yoshito Chikaraishi, Tetsuichi Fujiki, Naomi Harada, Makio Honda, Naohiko Ohkouch
  • Organizer: Japan Geoscience Union Meeting (JpGU 2016)
  • Place of Presentation: 幕張メッセ、千葉県千葉市
  • Year and Date: 2016-05-22
• [Presentation] Nitrogen isotope ratios of phytoplankton in the northwestern North Pacific (2016)
  • Author(s): Chisato Yoshikawa, Haruyo Yamaguchi, Nanako O. Ogawa, Hisami Suga, Akiko Makabe, Yohei Matsui, Shinsuke Kawagucci, Tetsuichi Fujiki, Naomi Harada, Naohiko Ohkouchi
  • Organizer: 10th International Conference on the Applications of Stable Isotope Techniques to Ecological Studies (IsoEcol 2016)
  • Place of Presentation: 東大本郷キャンパス、東京都文京区
  • Year and Date: 2016-04-04
  • Int'l Joint Research
• [Presentation] 分子内同位体比を用いた海洋N2Oモデルの開発 (2016)
  • Author(s): 吉川 知里、笹井義一、脇田昌英、本多牧生、眞壁明子、布浦拓郎、松嶋修一郎、豊田栄、吉田尚弘、小川奈々子、菅寿美、大河内直彦
  • Organizer: 日本海洋学会2016年度春季大会
  • Place of Presentation: 東京大学、東京都文京区
  • Year and Date: 2016-03-17
• [Presentation] Insight into nitrous oxide production processes in the western North Pacific based on a marine ecosystem isotopomer model (2016)
  • Author(s): Chisato Yoshikawa, Yoshikazu Sasai, Masahide Wakita, Makio C. Honda, Tetsuichi Fujiki, Naomi Harada, Akiko Makabe, Shuichiro Matsushima, Sakae Toyoda, Naohiro Yoshida, Nanako O. Ogawa, Hisami Suga, Naohiko Ohkouchi
  • Organizer: 2016 Ocean Science Meeting
  • Place of Presentation: The Ernest N. Morial Convention Center, New Orleans, LA, USA
  • Year and Date: 2016-02-24
  • Int'l Joint Research
• [Presentation] 海洋低次生態系モデルへの亜硝酸塩の導入 (2015)
  • Author(s): 吉川知里、笹井義一、眞壁明子、布浦拓郎、脇田昌英、 本多牧生
  • Organizer: 東京大学大気海洋研究所共同利用研究集会「2015年度海洋生態系モデリングシンポジウム」
  • Place of Presentation: 東京大学大気海洋研究所、千葉県柏市
  • Year and Date: 2015-11-19
• [Presentation] 海洋生態系‐同位体分子種モデルを用いた西部北太平洋におけるN2O生成プロセスの解明 (2015)
  • Author(s): 吉川知里、笹井義一、脇田昌英、本多牧生、眞壁明子、松嶋修一郎、豊田栄、吉田尚弘、小川奈々子、菅寿美、大河内直彦
  • Organizer: 2015年度日本地球化学会第62回年会
  • Place of Presentation: 横浜市立大学、神奈川県横浜市
  • Year and Date: 2015-09-26