Investigation of variability in atmospheric bioavailable iron supplied to the Southern Ocean

• Project/Area Number: 16K00530
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: ITO Akinori 国立研究開発法人海洋研究開発機構, 気候モデル高度化研究プロジェクトチーム, 主任研究員 (00419144)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 地球環境変化 / 大気化学輸送モデル / 人為起源鉄 / 溶存鉄 / 鉄溶解率 / 大気由来の水溶性鉄沈着 / 燃焼起源エアロゾル / 鉱物起源エアロゾル / 全球エアロゾル化学輸送モデル / ダスト発生スキーム / 土壌水分量 / 植生被覆率 / 地球変動予測 / 大気現象 / 地球化学 / 大気化学 / 物質循環モデリング

Outline of Final Research Achievements

We collected model results and data from the international community to statistically analyze prediction results from multiple global atmospheric chemical transport models and observation data from various regions of the world’s ocean. The results of our analyses showed that anthropogenic iron changes its chemical properties as it is transported through the atmosphere to the sea. Moreover, this is a primary factor in a large amount of water-soluble iron being incorporated into microparticles (aerosols) over the open ocean.

Academic Significance and Societal Importance of the Research Achievements

今後、人間活動による化石燃焼の燃焼が植物プランクトン（一次生産者）を起点とした食物連鎖（海洋生態系）へ与える影響を評価し、より有効な海洋環境保全策へ貢献することが期待される。さらに、本研究で得られた知見は、既存の大気・海洋生態系間の相互作用を考慮に入れた地球システムモデルの生物地球化学と気候の相互作用における改善を迫る重要な成果である。

Research Products

• [Int'l Joint Research] Cornell University/Rutgers University/Florida State University(米国)
• [Int'l Joint Research] University of East Anglia(英国)
• [Int'l Joint Research] Utrecht University(オランダ)
• [Int'l Joint Research] National Observatory of Athens/University of Crete/Foundation for Research and Technology(ギリシャ)
• [Int'l Joint Research] Physical Research Laboratory(インド)
• [Int'l Joint Research]
• [Int'l Joint Research] Pacific Northwest National Laboratory/University of Michigan(米国)
• [Int'l Joint Research] カリフォルニア大学(米国)
• [Journal Article] Pyrogenic iron: The missing link to high iron solubility in aerosols (2019)
  • Author(s): Ito, A., S. Myriokefalitakis, M. Kanakidou, N. M. Mahowald, R. A. Scanza, D. S. Hamilton, A. R. Baker, T. Jickells, M. Sarin, S. Bikkina, Y. Gao, R. U. Shelley, C. S. Buck, W. M. Landing, A. R. Bowie, M. M. G. Perron, C. Guieu, N. Meskhidze, M. S. Johnson, Y. Feng, J. F. Kok, A. Nenes, R. A. Duce
  • Journal Title: Science Advances Volume: 5 Issue: 5
  • DOI: 10.1126/sciadv.aau7671
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reviews and syntheses: the GESAMP atmospheric iron deposition model intercomparison study (2018)
  • Author(s): Myriokefalitakis, S., A. Ito, M. Kanakidou, A. Nenes, M. C., Krol, N. M. Mahowald, R. A. Scanza, D. S. Hamilton, M. S. Johnson, N. Meskhidze, J. F. Kok, C. Guieu, A. R. Baker, T. D. Jickells, M. M. Sarin, S. Bikkina, R. Shelley, A. Bowie, M. M. G. Perron and R. A. Duce
  • Journal Title: Biogeosciences Volume: 15 Issue: 21 Pages: 6659-6684
  • DOI: 10.5194/bg-15-6659-2018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Radiative forcing by light-absorbing aerosols of pyrogenetic iron oxides (2018)
  • Author(s): Ito Akinori、Lin Guangxing、Penner Joyce E.
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 7347-7347
  • DOI: 10.1038/s41598-018-25756-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Do dust emissions from sparsely vegetated regions dominate atmospheric iron supply to the Southern Ocean? (2017)
  • Author(s): Ito, A., and J. F. Kok
  • Journal Title: Journal of Geophysical Research Atmosphere Volume: 122 Issue: 7 Pages: 3987-4002
  • DOI: 10.1002/2016jd025939
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Impacts of acidity on atmospheric Fe input to ocean biogeochemical cycles (2018)
  • Author(s): Ito, A.
  • Organizer: Goldschmidt 2018
  • Int'l Joint Research / Invited
• [Presentation] Atmospheric modeling studies of iron speciation: Problems and challenges in future studies (2018)
  • Author(s): Ito, A.
  • Organizer: Identifying and Characterizing the Processes Controlling Iron Speciation and Residence Time at the Atmosphere-Ocean Interface
  • Invited
• [Presentation] Atmospheric deposition of iron from mineral aerosols to the ocean (2018)
  • Author(s): Ito, A., Akitomo Yamamoto, Michio Watanabe, Maki Noguchi Aita, Jan-Berend W. Stuut
  • Organizer: 2018 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] Atmospheric deposition of iron from mineral aerosols to ocean ecosystem model (2018)
  • Author(s): 2.Ito, A., Jan-Berend W. Stuut, Akitomo Yamamoto, Michio Watanabe, Maki Noguchi Aita, Li Chuxian, Stephanie Arcusa, Navjit Sagoo, Zahra Hoseini, Charles Gonzales, Francois De Vleeschouwer
  • Organizer: International conference on aeolian research 2018
  • Int'l Joint Research
• [Presentation] Aerosol radiative forcing of pyrogenetic iron oxides (2018)
  • Author(s): Ito, A., G. Lin, and J. E. Penner
  • Organizer: IGAC 15th International Conference
  • Int'l Joint Research
• [Presentation] エアロゾル中における鉄への燃焼起源の寄与 (2018)
  • Author(s): 伊藤 彰記、Stelios Myriokefalitakis, Maria Kanakidou, Natalie Mahowald, Rachel Scanza, Alex Baker, Tim Jickells, Manmohan Sarin, Srinivas Bikkina, Yuan Gao, Rachel Shelley, Clifton Buck, William Landing, Andrew Bowie, Morgane Perron, Nicholas Meskhidze, Matthew Johnson, Yan Feng, Robert Duce
  • Organizer: 日本地球惑星科学連合2018年大会
• [Presentation] Atmospheric modeling studies of labile iron in modern day (2018)
  • Author(s): Ito, A.
  • Organizer: PAGES-DICE workshop
  • Int'l Joint Research / Invited
• [Presentation] 大気中の鉄と有機態窒素：研究プロジェクト（GESAMP & DICE）における大気化学輸送モデルの果たす役割 (2018)
  • Author(s): 伊藤彰記
  • Organizer: 日本エアロゾル学会、海洋大気エアロゾル研究集会
  • Invited
• [Presentation] The GESAMP global model intercomparison: Evaluation of labile iron in aerosols (2018)
  • Author(s): Ito, A., S. Myriokefalitakis, M. Kanakidou, N. Mahowald, R. A. Scanza, A. Baker, T. Jickells, M. Sarin, S. Bikkina, Y. Gao, R. Shelley, C. Buck, W. Landing, A. Bowie, M. Perron, N. Meskhidze, M. Johnson, Y. Feng, R. Duce
  • Organizer: EGU General Assembly 2018
  • Int'l Joint Research / Invited
• [Presentation] Evaluation of labile iron formation in the atmosphere (2018)
  • Author(s): Ito, A., S. Myriokefalitakis, M. Kanakidou, N. Mahowald, R. A. Scanza, A. Baker, T. Jickells, M. Sarin, S. Bikkina, Y. Gao, R. Shelley, C. Buck, W. Landing, A. Bowie, M. Perron, N. Meskhidze, M. Johnson, Y. Feng, R. Duce
  • Organizer: 2018 Ocean Science Meeting
  • Int'l Joint Research
• [Presentation] Mineral traveling from land to ocean through atmosphere: Atmospheric chemistry is Iron Chef (2017)
  • Author(s): Ito, A.
  • Organizer: School seminar
  • Place of Presentation: University of Birmingham (Birmingham, United Kingdom)
  • Year and Date: 2017-03-03
  • Int'l Joint Research / Invited
• [Presentation] Model schemes for simulating the influence of acidity of nutrient / trace metal solubility (2017)
  • Author(s): Nenes, A., A. Ito
  • Organizer: GESAMP WG38 Workshop
  • Place of Presentation: University of East Anglia (Norwich, United Kingdom)
  • Year and Date: 2017-02-27
  • Int'l Joint Research / Invited
• [Presentation] Evaluation of labile iron processing in atmospheric models (2017)
  • Author(s): Ito, A., S. Myriokefalitakis, M. Kanakidou, N. Mahowald, R. A. Scanza, A. Baker, T. Jickells, M. Sarin, S. Bikkina, Y. Gao, R. Shelley, C. Buck, W. Landing, A. Bowie, M. Perron, N. Meskhidze, M. Johnson, Y. Feng, R. Duce
  • Organizer: Goldschmidt 2017
  • Int'l Joint Research
• [Presentation] Radiative forcing of iron oxides from combustion sources, (2017)
  • Author(s): Ito, A., G. Lin, and J. E. Penner
  • Organizer: 2017 AGU Fall Meeting
  • Int'l Joint Research
• [Presentation] 燃焼発生源の酸化鉄による放射強制力 (2017)
  • Author(s): 伊藤彰記、Lin Guangxing、Penner Joyce E.
  • Organizer: 第23回大気化学討論会
• [Presentation] GESAMP全球モデル相互比較：大気中における不安定鉄生成過程の評価 (2017)
  • Author(s): 伊藤 彰記、Myriokefalitakis Stelios、Kanakidou Maria、Mahowald Natalie、Baker Alex、Jickells Tim、Sarin Manmohan、Bikkina Srinivas、Gao Yuan、Shelley Rachel、Buck Clifton、Landing William、Bowie Andrew、Perron Morgane、Meskhidze Nicholas、Johnson Matthew、Feng Yan、Duce Robert
  • Organizer: 2017年度日本地球化学会年会
• [Presentation] Global modeling study of dust source and soluble Fe input to the Southern Ocean (2016)
  • Author(s): Ito, A., J. F. Kok
  • Organizer: 2016 AGU Fall Meeting
  • Place of Presentation: The Moscone Center (San Francisco, California, USA)
  • Year and Date: 2016-12-14
  • Int'l Joint Research
• [Presentation] Spatial and Seasonal Variability in Soluble Iron Deposition and Contribution to Sea-surface Iron Distributions (2016)
  • Author(s): Feng Y., B. Drewniak, A. Ito
  • Organizer: 2016 AGU Fall Meeting
  • Place of Presentation: The Moscone Center (San Francisco, California, USA)
  • Year and Date: 2016-12-14
  • Int'l Joint Research
• [Presentation] 南大洋域へ供給される鉱物エアロゾルに関する全球エアロゾル化学輸送モデル解析 (2016)
  • Author(s): 伊藤彰記、Kok Jasper F.
  • Organizer: 日本気象学会2016年度秋季大会
  • Place of Presentation: 名古屋大学(愛知県名古屋市)
  • Year and Date: 2016-10-28
• [Presentation] Global modeling study of dust source and soluble Fe input to the Southern Ocean (2016)
  • Author(s): Ito, A., J. F. Kok
  • Organizer: IGAC 14th International Conference
  • Place of Presentation: The Beaver Run Resort & Conference Center (Breckenridge, Colorado, USA)
  • Year and Date: 2016-09-29
  • Int'l Joint Research
• [Presentation] Global modeling study of dust source and Fe input to the Southern Ocean (2016)
  • Author(s): Ito, A., J. F. Kok
  • Organizer: Goldschmidt 2016
  • Place of Presentation: パシフィコ横浜(神奈川県横浜市)
  • Year and Date: 2016-06-29
  • Int'l Joint Research
• [Presentation] 南大洋域における海洋生態系へ供給される鉄起源としての鉱物エアロゾル (2016)
  • Author(s): 伊藤彰記、Kok Jasper F.
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 幕張メッセ(千葉県千葉市)
  • Year and Date: 2016-05-23
• [Remarks] 人間活動により放出された鉄粒子は大気汚染の影響で海水へ溶けやすくなる
  • URL: https://www.jamstec.go.jp/j/about/press_release/20190502/
• [Remarks] 「排出インベントリ」で、見過ごされてきた大気汚染物質の大気加熱効果を推定
  • URL: https://www.jamstec.go.jp/iccp/j/topics/20180605/