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Ozaki Lab
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The lab uses calculations of the cycling of matter to uncover the history and future of Earth's environment.
AboutAbout the lab
Why is Earth a "planet of life"?
The Ozaki Lab studies how Earth's environment came to be as it is today and how it will change in the future.
It treats Earth as a single system in which the atmosphere, oceans, and life interact, and approaches it through the theory of biogeochemical cycles.
Based on its findings, the lab aims to build a foundation for considering the evolution of Earth-like planets outside the solar system.
As a new lab in a new field, it welcomes motivated students who want to take on research challenges.
Key terms
- Biogeochemical cycle
- The movement of elements such as carbon and oxygen among the atmosphere, oceans, living things, and rocks
- Exoplanet
- A planet that orbits a star other than the Sun. Observations to search for signs of life on exoplanets are anticipated
- Oceanic anoxic event
- A past event in which oxygen levels became extremely low over a wide area of the ocean for a long period
NewsLab news
Results of a collaborative study published in an Earth and planetary science journal
Research results published in The Astrophysical Journal
Received the School of Science Education Award for fiscal 2025
A master's student received the Student Outstanding Presentation Award from the Society for Origin of Life and Astrobiology
Research results published in Viva Origino
ResearchResearch themes
The lab aims to explain changes in Earth's environment rigorously, from the theory of cycles of matter and energy. Combining mathematical models with observational data and geological records, it studies the history of the composition of the atmosphere and oceans, the mechanisms of mass extinctions, the distant future of Earth's environment, and the conditions under which life could exist on exoplanets.
*Illustrative imageConditions That Cause Oxygen Depletion in the Oceans
The lab develops models of biogeochemical cycles in the ocean to investigate the conditions under which oceanic anoxic events occur, in which large areas of the ocean were depleted of oxygen for a long time.
*Illustrative imageHistory of Atmospheric Oxygen
The oxygen in today's air is understood to come from photosynthesis. However, many aspects of the history of oxygen are still unknown.
*Illustrative imageEarly Microbes and Climate
The Sun is thought to have been dimmer in the past than it is now, yet Earth had a warm climate. Microbial activity is thought to have played a role in this mechanism.
*Illustrative imageOther Research
By building numerical models of the cycles of matter and energy, the lab also works on the relationship between the evolution of land plants and the rise in oxygen, and on predicting how long Earth's biosphere will last.
MembersFaculty
The Ozaki Lab's members include faculty, researchers, and master's and undergraduate students.As of 2026
- Associate ProfessorKazumi OzakiPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Blue Marble Western Hemisphere” NASA / Reto Stöckli / Public domain (cropped)
- Conditions That Cause Oxygen Depletion in the Oceans: “Phytoplankton Bloom in Baltic Sea (MODIS )” Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
- History of Atmospheric Oxygen: “Stromatolites at Hamelin Pool in Shark Bay - Western Australia - 27 Aug. 2014” Bryn Pinzgauer / CC BY 2.0 (cropped)
- Early Microbes and Climate: “Microbial mat - asessions” Alicejmichel / CC BY-SA 4.0 (cropped)
- Other Research: “Emiliania huxleyi coccolithophore (PLoS)” Alison R. Taylor (University of North Carolina Wilmington Microscopy Facility) / CC BY 2.5 (cropped)
- Related lab (上野雄一郎研究室): “Stromatolites at Hamelin Pool in Shark Bay - Western Australia - 27 Aug. 2014” Bryn Pinzgauer / CC BY 2.0 (cropped)
- Related lab (石川研究室): “Lherzolite mantle xenolith in basalt (Afton Basalt Flow Upper Pleistocene, 15-20 ka; Kilbourne Hole Crater, Aden-Afton Basalt Field, Potrillo Volcanic Field, southwestern New Mexico, USA) ( )” James St. John / CC BY 2.0 (cropped)
- Related lab (玄田研究室): “The Earth seen from Apollo 17” NASA/Apollo 17 crew / Public domain (cropped)
- Related lab (太田研究室): “DiamondAnvilCell 003” National Institute of Standards and Technology / Public domain (cropped)
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