[preprint] Ozaki, K., Cole, D. B., Reinhard, C. T., and Tajika, E. (2022). CANOPS-GRB v1.0: a new Earth system model for simulating the evolution of ocean-atmosphere chemistry over geologic timescales. Geosci. Model. Dev. Discuss. (in review). [Link]
Cole, D. B., Ozaki, K., Reinhard, C. T. (2022). Atmospheric oxygen abundance, marine nutrient availability, and organic carbon fluxes to the seafloor. Global Biogeochemical Cycles, 36, e2021GB007052. [Link]
Ozaki, K. and Reinhard, C. T. (2021). The future lifespan of Earth's oxygenated atmosphere. Nature Geoscience, 14, 138—142. [Link][プレスリリース@東邦大]
Kuroyanagi, A., Kawahata, H., Ozaki, K., Suzuki, A., Nishi, H., Takashima, R. (2020). What drove the evolutionary trend of planktic foraminifers during the Cretaceous: Oceanic Anoxic Events (OAEs) directly affected it? Marine Micropaleontology, 161: 101924. [Link]
Ozaki, K. (2020). The coupled evolution of the atmosphere and life: A biogeochemical modeling perspective. Geochemistry, 54, 153—172. (In Japanese with English abstract) *Special paper for a Young Scientist Award 2019 by The Geochemical Society of Japan. 尾﨑和海 (2020) 物質循環モデルで探る地球大気と生命の共進化. 地球化学, 54, 153—172. *日本地球化学会奨励賞受賞記念論文
Ikeda, M., Ozaki, K., Legrand, J. (2020). Impact of 10-Myr scale monsoon dynamics on Mesozoic climate and ecosystems. Scientific Reports, 10, 11984. [Link][プレスリリース@東大][プレスリリース@東邦大]
Planavsky, N. J., Reinhard, C. T., Isson, T. T., Ozaki, K., Crockford, P. W. (2020). Large mass-independent oxygen isotope fractionations in mid-Proterozoic sediments: Strong evidence for a low-oxygen atmosphere. Astrobiology, 20: 628—636. [Link]
Ozaki, K., Thompson, K., Simister, R. L., Crowe, S. A., Reinhard, C. T. (2019). Anoxygenic photosynthesis and the delayed oxygenation of Earth's atmosphere. Nature Communications, 10:3026. [Link][プレスリリース@東邦大][プレスリリース@ジョージア工科大]
Schwieterman, E. W., Reinhard, C. T., Olson, S. L., Ozaki, K., Harman, C. E., Hong, P. K., Lyons, T. W. (2019). Rethinking CO "Anti-Biosignatures" in the search for life beyond Earth. The Astrophysical Journal 874:9. [Link]
Ozaki, K., Tajika, E., Hong, P. K., Nakagawa, Y., Reinhard, C. T. (2018). Effects of primitive photosynthesis on Earth's early climate system. Nature Geoscience, 11: 55—59.[Link][プレスリリース@東大][プレスリリース@ジョージア工科大]
Ikeda, M., Tada, R. & Ozaki, K. (2017). Astronomical pacing of the global silica cycle recorded in Mesozoic bedded cherts. Nature Communications, 8: 15532. [Link][プレスリリース@静岡大]
Reinhard, C. T., Planavsky, N. J., Gill, B. C., Ozaki, K., Robbins, L. J., Lyons, T. W., Fischer, W. W., Wang, C., Cole, D. B., Konhauser, K. O. (2017). Evolution of the global phosphorus cycle. Nature, 541: 386—389. [Link][プレスリリース]
Lenton, T. M., Dahl, T. W., Daines, S. J., Mills, B. J. W., Ozaki, K., Saltzman, M. R., Porada, P. (2016). Earliest land plants created modern levels of atmospheric oxygen. Proceedings of the National Academy of Sciences, 113: 9704—9709. [Link][プレスリリース]
Lee, Cin-Ty A., Yeung, L. Y., McKenzie, N. R., Yokoyama, Y., Ozaki, K., Lenardic, A. (2016). Two-step rise of atmospheric oxygen linked to the growth of continents. Nature Geoscience, 9: 417—424. [Link][プレスリリース@東大]
Ozaki, K. & Tajika, E. (2013). Biogeochemical effects of atmospheric oxygen concentration, phosphorus weathering, and sea-level stand on oceanic redox chemistry: Implications for greenhouse climates. Earth and Planetary Science Letters, 373: 129—139. [Link]
Kashiyama, Y., Ozaki, K. & Tajika, E. (2011). Impact of the evolution of carbonate ballasts on marine biogeochemistry in the Mesozoic and associated changes in energy delivery to subsurface waters. Paleontological Research, 15: 89—99. [Link]
Ozaki, K., Tajima, S. & Tajika, E. (2011). Conditions required for oceanic anoxia/euxinia: Constraints from a one-dimensional ocean biogeochemical cycle model" Earth and Planetary Science Letters, 304: 270—279. [Link]
白書
Reinhard, C.T., Bozdag, O., Cole, D.B., Crowe, S.A., Droser, M.L., Erwin, D.H., Javaux, E.J., Love, G.D., Lyons, T.W., Mills, D.B., Olson, S.L., Ozaki, K., Planavsky, N.J., Ratcliff, W.C., Ridgwell, A., Saupe, E.E., Schwieterman, E.W., Sperling, E.A., Stockey, R.G., Tarhan, L.G. (2020). Environmental drivers of evolving biological complexity on Earth. [white paper submitted in response to the Request for Information (RFI) on the Astrobiology Research Coordination Network — Early Cells to Multicellularity (ECM)].
Reinhard, C. T., Schwieterman, E. W., Olson, S. L., Planavsky, N. J., Arney, G. N., Ozaki, K., Som, S., Robinson, T. D., Domagal-Goldman, S. D., Lisman, D., Mennesson, B., Meadows, V. S., Lyons, T. W. (2019). The remote detectability of Earth's biosphere through time and the importance of UV capability for characterizing habitable exoplanets. [white paper submitted in response to the solicitation of feedback for the Decadal Survey on Astronomy and Astrophysics (Astro 2020) by the National Academy of Sciences]. arXive preprint arXiv:1903.05611, 2019.
受賞・表彰等
Top Cited Article 2019-2020 (Geobiology, 2021年4月)
Top Downloaded Paper 2018-2019 (Geobiology, 2020年5月)
地球環境史学会 奨励賞(2019年11月)
日本地球化学会 奨励賞(2019年9月)
日本地球惑星科学連合大会 優秀講演賞(2015年5月)
日本学生支援機構 第一種奨学金 全額返還免除(2012年5月)
日本地球化学会 年会 学生優秀講演賞(2011年9月)
日本地球化学会 年会 学生優秀講演賞(2010年9月)
競争的資金獲得状況
科学研究費助成事業 基盤研究(C)(代表)[2020~2022]
採択課題:全球酸化還元収支モデルを用いた富酸素地球大気の持続期間の推定
科学研究費助成事業 国際共同研究強化(B)(分担) [2018~2020]
採択課題:超大陸と超海洋から読み解く中生代の地球環境変化とその生態系への影響
住友財団 基礎科学研究助成(代表) [2018~2019]
研究課題:水素―鉄ー炭素循環に基づく太古代の気候安定化メカニズムについての理論的研究
科学研究費助成事業 研究活動スタート支援(代表) [2018~2019]
採択課題:地球システムモデルによる原生代の大気組成の制約
理学部スタートアップ研究(代表)(学内助成)[2018~2019]
採択課題:全球酸化還元収支モデルによる太古代の海洋一次生産の制約
NASAポストドクトラルプログラム(代表)[2016~2018]
採択課題:New quantitative approaches toward understanding the life history of an inhabited planet
科学研究費助成事業 若手研究(B) (代表)[2013~2016]
採択課題:原生代の大気海洋化学組成の制約とその安定性・変動性に関する理論的研究
日本地球化学会 鳥居基金 [2012]
交付理由:第22回ゴールドシュミット国際学術会議での研究発表
財団法人 日本科学協会 笹川科学研究助成 [2011~2012]
研究課題:海洋物質循環モデルの開発と海洋無酸素イベントの発生に関する研究
東京工業大学・東京大学 GCOE『地球から地球たちへ』リサーチアシスタント [2010]
研究課題:海洋物質循環モデルの開発と海洋無酸素イベントの発生に関する研究
学会発表 2022
Watanabe, Y., Tajika, E., Ozaki, K., "Co-evolution of atmosphere and marine biosphere driven by oxygenic photosynthesis before the Great Oxidation Event" Goldschmidt (June, 2022) [予定]
Aoyama, K., Tajika, E., Ozaki, K., "Estimating burial rates of organic carbon in terrestrial and marine environments through Phanerozoic time using a geochemical model" Goldschmidt (June, 2022) [予定]
Ozaki, K., "The coupled evolution of life and the atmosphere during the early Archean" JpGU (May, 2022)【招待講演】 [予定]
Watanabe, Y., Tajika, E., Ozaki, K., "Co-evolution of marine oxygen and iron biogeochemical cycles in the history of the Earth" JpGU (May, 2022) [予定]
Watanabe, Y., Tajika, E., Ozaki, K., "Interactions of atmosphere and marine biosphere after the emergence of oxygenic photosynthesis in the early Earth" JpGU (May, 2022) [予定]
Kobayashi, H., Ozaki, K., "Biogeochemical modeling perspective on the role of phosphorus cycle during the Great Oxidation Event" JpGU (May, 2022) [予定]
Ozaki, K., "Conditions required for oceanic anoxia/euxinia revisited" Goldschmidt (July, 2021)【招待講演】
Watanabe Y., Tajika, E., Ozaki, K., and Hong, P. K. "Haze formation limits the primary productivity of marine anaerobic ecosystem during the Archean" Goldschmidt (July, 2021)
Smart, M. S., Ozaki, K., Reinhard, C. T., Marshall, J. E. A., Whiteside, J., Gilhooly, W., and Filippelli, G. "Modeling global biosphere response to enhanced riverine nutrient delivery during the Late Devonian Kellwasser Event" Goldschmidt (July, 2021)
渡辺泰人, 田近英一, 尾﨑和海, 洪鵬 ”Upper limit of the activity of anaerobic microbial ecosystem in the early Earth" JpGU Annual Meeting 2021 (Virtual, June)
Watanabe, Y., Tajika, E., Ozaki, K., and Hong, P. K. "Effect of hydrocarbon haze on marine primary production in the early Earth system" EGU 2021 (April)
2020
渡辺泰人, 田近英一, 尾﨑和海, 洪鵬 ”Potential positive feedback mechanisms in an anoxic environmental system of a planet with CO2-CH4 atmosphere" JpGU-AGU Joint Meeting 2020 (Virtual, July)
渡辺泰人, 田近英一, 尾﨑和海, 洪鵬 ”Effect of hydrocarbon haze on climate stability under weakly oxidized late Archean environment" JpGU-AGU Joint Meeting 2020 (Virtual, July)
三木あかり, 田近英一, 尾﨑和海 "Modelling the behaviors of marine carbon isotopic composition after Neoproterozoic snowball Earth event" JpGU-AGU Joint Meeting 2020 (Virtual, July)
青山和弘, 田近英一, 尾﨑和海 "Variations of burial rates of organic carbon in terrestrial and marine environments during the Phanerozoic" JpGU-AGU Joint Meeting 2020 (Virtual, July)
Ozaki, K., Reinhard, C. T. "The future life span of Earth's oxygenated biosphere and its controlling factors" JpGU-AGU Joint Meeting 2020 (Virtual, July)【招待講演】
Ozaki, K. "The history of Earth's biospheric productivity: a biogeochemical modeling perspective" JpGU-AGU Joint Meeting 2020 (Virtual, July)【招待講演】
Cole, D. B., Ozaki, K., Reinhard, C. T. "Biogeochemically feasible levels of nutrient availability, biospheric productivity, and atmospheric oxygen" Goldschmidt (Virtual, June)
Ozaki, K. and Miura, Y. "Sulfur cycle dynamics during the Great Oxidation Event" Goldschmidt (Virtual, June)
2019
Watanabe Y., Tajika, E., Ozaki, K., and Hong, P. K. "Global carbon cycle and climate stability in the Archean: Haze-free warm condition in the anoxic Earth system" American Geophysical Union (San Francisco, USA, December)
Ozaki, K. & Reinhard, C. T. "Limited biological productivity in the Archean anoxic ocean" Goldschmidt (Barcelona, Spain, August)
Cole, D., Ozaki, K., Planavsky, N., Reinhard, C. T. "Intermediate atmospheric oxygen levels, ocean ventilation, and global biospheric productivity" Goldschmidt (Barcelona, Spain, August)【招待講演】
Planavsky, N., Reinhard, C. T., Isson, T., Ozaki, K., & Crockford, P. "Low Mid-Proterozoic atmospheric oxygen levels?" Goldschmidt (Barcelona, Spain, August)
Watanabe Y., Tajika, E., Ozaki, K., and Hong, P. K. "Global carbon cycle and climate stability in the early Earth system"
Ozaki, K. "The coupled evolution of life and atmosphere", 2nd Geobiology Society Conference (Banff, Canada, June)【招待講演】
渡辺泰人, 田近英一, 尾﨑和海, 洪鵬 ”Effects of the formation of hydrocarbon aerosols on the climate stability of Earth-like planets and their habitability" 地球惑星科学連合大会2019年大会(千葉幕張メッセ 5月)
渡辺泰人, 田近英一, 尾﨑和海, 洪鵬 ”Behaviors of carbon cycle system and inevitability of the hot climate in the Archean Earth" 地球惑星科学連合大会2019年大会(千葉幕張メッセ 5月)【招待講演】
芳賀万由子, 田近英一, 尾﨑和海 ”Response of primary producers in the ocean anoxic events during the Cretaceous" 地球惑星科学連合大会2019年大会(千葉幕張メッセ 5月)
三浦優奈, 尾﨑和海 ”Biogeochemical dynamics during the Great Oxidation Event constrained by a biogeochemical cycle model” 地球惑星科学連合大会2019年大会(千葉幕張メッセ 5月)
Zijian, L., Owens, J. D., Planavsky, N. J., Ozaki, K., Reinhard, C. T. "A thallium isotope record of ocean oxygenation during the Lomagundi Event", Goldschmidt (Boston, USA, August).
Ozaki, K. ”Effects of primitive biosphere and reductant supply from the mantle on the Earth's early climate” 地球惑星科学連合大会2018年大会(千葉幕張メッセ 5月)【招待講演】
Ozaki, K., Tajika, E., Hong, P. K., Nakagawa, Y., Reinhard, C. T. "Climatic consequenses of methane boosting by photoferrotrophs in the Archean atmosphere", Goldschmidt (Paris, France, August)
Ozaki, K., Tajika, E., Hong, P. K., Reinhard, C. T. "Primitive photosynthesis and Earth's early climate", Geobiology Society 1st Conference (Banff, Canada, June)
Ozaki, K., Tajika, E. & Reinhard, C. T. "Limited O2 production in the Mid-Proterozoic oceans", AbSciCon 2017 (Mesa, USA, April)
2016
Ikeda, M.,Ozaki, K. & Tada, R. "Global silica cycle paced by astronomical cycles recorded in the Mesozoic bedded chert: Implications for early Mesozoic extinctions", American Geophysical Union (San Francisco, USA, December)
Takahashi, S., Gordon, G., Ozaki, K., Yamasaki, S., Kumura, K., Anbar, A., and Tada, R. "Variations of U and Mo isotopes across the deep sea Permian-Triassic boundary", Goldschmidt (Yokohama, Japan, June)
Ozaki, K. & Tajika, E. "Stability and Dynamics of Proterozoic Oceanic Euxinia", Goldschmidt (Yokohama, Japan, June)【招待講演】
Reinhard, C. T., Crowe, S., Ozaki, K., Thompson, KJ. "An ecophysiological throttle on planetary oxygenation during the Archean", Goldschmidt (Yokohama, Japan, June)【招待講演】
Ozaki, K.& Tajika, E. "Climatic, tectonic, and biological factors affecting the oxidation state of the atmosphere and oceans: Implications for Phanerozoic O2 evolution", American Geophysical Union (San Francisco, USA, December)【招待講演】
Ozaki, K. & Tajika, E. "Towards a quantitative understanding of the mid-Proterozoic redox state of the atmosphere and oceans", Goldschmidt (Praha, Czech, August)
Ozaki, K. & Tajika, E. "Widespread euxinia in the aftermath of the Lomagundi event: insights from a modeling study of ocean biogeochemical dynamics", European Geosciences Union (Wien, Austria, April)
Harada, M., Ozaki, K., Tajika, E., and Sekine, Y. "Overshoot of atmospheric oxygen caused by the Paleoproterozoic snowball glaciation: constraining its magnitude and duration from biogeochemical cycle modeling", American Geophysical Union (San Francisco, USA, December)
Kuroyanagi, A., Ozaki, K., & Kawahata, H. "Effect of Cretaceous oceanic anoxic events on the evolutionary trend of planktonic foraminifera", American Geophysical Union (San Francisco, USA, December)
Harada, M., Ozaki, K., Tajika, E., and Sekine, Y. "Modeling dynamics of the rise of oxygen during Paleoproterozoic: deep water oxygenation and sulfate accumulation in the post-snowball ocean", Geological Society of America (Vancouver, Canada, October)
Ozaki, K. "Modeling oxygenation of an ocean-atmosphere system during the Late Ordovician-Devonian", American Geophysical Union (San Francisco , USA, December)
Harada, M., Tajika, E., Sekine, Y., Ozaki, K. "Numerical study of mechanisms and timescales of oxygenation and interpretation of geological records in the snowball Earth aftermath", Geological Society of America (Denver, USA, October)
Ozaki, K. & Tajika, E. "Conditions for Proterozoic anoxic and non-sulfidic ocean: Constraints from ocean biogeochemical cycle model", Goldschmidt (Florence, Italy, August)
Harada, M., Tajika, E., Sekine, Y., Ozaki, K. "Modeling the rise of oxygen in the Snowball earth aftermath: implications for the Paleoproterozoic manganese and iron formation", Japan Geoscience Union (Chiba, Japan, May)
Harada, M., Tajika, E., Sekine, Y., Ozaki, K., "Rise of oxygen induced by Paleoproterozoic snowball glaciation: Insights from biogeochemical cycle modeling", American Geophysical Union (USA, December)
Ozaki, K. & Tajika, E. "Modeling the Redox Chemistry of Mid-Proterozoic Atmosphere-Ocean System", Geological Society of America (Charlotte, USA, October)
Ozaki, K. & Tajika, E. "Modeling ocean acidification and de-oxygenation: Testing the linkage between large igneous province and Ocean Anoxic Event", Goldschmidt (Montreal, Canada, June)
Ozaki, K. & Tajika, E. "Modeling oceanic redox conditions during the Phanerozoic: Constraints from a one-dimensional ocean biogeochemical cycle model", European Geosciences Union (Wien, Austria, April)
Ozaki, K.& Tajika, E. "Conditions for global ocean anoxia obtained from a one-dimensional ocean biogeochemical cycle model", American Geophysical Union (San Francisco, USA, December)