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Tajika Lab
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A lab that uses numerical models to explore the history in which Earth's environment and life have evolved together.
AboutAbout the lab
Unraveling the co-evolution of Earth and life
The Tajika Lab studies how the surface environments of Earth and other planets formed and have changed over time, and how these changes relate to the origin, evolution, and extinction of life.
The lab focuses in particular on large-scale environmental changes linked to mass extinctions, such as global glaciation (Snowball Earth), asteroid impacts, and oceanic anoxic events.
Its main method is numerical simulation using climate models and biogeochemical cycle models, and it also takes part in collaborative research involving field surveys and chemical analysis.
Building on these findings, the lab investigates the conditions for habitable planets, including Mars, Venus, and planets outside the solar system.
Key terms
- Global glaciation
- An event in which the entire Earth is thought to have been covered in ice. Also called Snowball Earth.
- Biogeochemical cycle model
- A computer model that uses equations to calculate how elements such as carbon, phosphorus, and oxygen circulate among the atmosphere, the oceans, and living organisms.
- Great Oxidation Event
- An event around 2.45 to 2.0 billion years ago when the concentration of oxygen in the atmosphere rose sharply.
NewsLab news
A doctoral student received the Outstanding Presentation Award at the 11th Annual Meeting of the Society for Earth Environmental History
Study suggests that a huge volcanic eruption may have triggered the late Archean ‘oxygen fluctuation’ (press release)
ResearchResearch themes
The lab addresses climate change throughout Earth's history, especially large-scale environmental changes linked to mass extinctions, through both theoretical work and field surveys. Its aim is to understand the behavior of the Earth system and the co-evolution of Earth's environment and life. The lab also seeks to clarify the conditions under which habitable planets can exist in the universe.
*Illustrative imageThe late Archean ‘oxygen fluctuation’
A research group including other universities and research institutions used a mathematical model to show that when a huge volcanic eruption occurred in the Archean, when the atmosphere contained almost no oxygen, continental weathering could carry nutrients into the ocean, boost photosynthesis, and temporarily raise atmospheric oxygen.
*Illustrative imageThe Faint Young Sun Paradox
A research group including other universities explained why the Archean Earth was warm even though the Sun was dimmer than it is today: when multiple photosynthetic bacteria that use hydrogen and iron coexist, atmospheric methane stays high.
*Illustrative imageThe oceans of the ‘Boring Billion’
A joint Japan-U.S. research team combined the geological record with a biogeochemical cycle model to show that the oceans from about 1.8 to 0.8 billion years ago were poor in nutrients, which kept oxygen production by photosynthesis low.
*Illustrative imageThe history of rising atmospheric oxygen
Numerical simulations showed that right after the end of a Snowball Earth glaciation, intense weathering made the oceans nutrient-rich, and photosynthesis by cyanobacteria caused atmospheric oxygen concentration to rise abruptly (the Great Oxidation Event).
MembersFaculty
The members of the Tajika Lab consist of faculty, collaborating researchers, visiting research fellows, and doctoral and master's students.As of 2026
- ProfessorEiichi TajikaPublications ↗
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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: “Snowball Huronian” Oleg Kuznetsov - 3depix - http://3depix.com/ / CC BY-SA 4.0 (cropped)
- The late Archean ‘oxygen fluctuation’: “Upper Cretaceous Lameta Formation and Deccan Traps (GeoDIL number - 78)” Joseph H. Hartman / CC0 (cropped)
- The Faint Young Sun Paradox: “Stromatolites at Hamelin Pool in Shark Bay - Western Australia - 27 Aug. 2014” Bryn Pinzgauer / CC BY 2.0 (cropped)
- The oceans of the ‘Boring Billion’: “Proterozoic Stromatolite Fossils from Montana” James St. John (jsj1771) https://www.flickr.com/people/jsjgeology/ / CC BY 2.0 (cropped)
- The history of rising atmospheric oxygen: “Oscillatoria filaments” Wiedehopf20 / CC BY-SA 4.0 (cropped)
- Related lab (Ikeda Lab): “Ribbon chert of the Marin Headlands Terrane, exposed at Marshall's Beach, San Francisco” Callanbentley / CC BY 4.0 (cropped)
- Related lab (Takigawa Lab): “Allende meteorite ( )” Steve Jurvetson / CC BY 2.0 (cropped)
- Related lab (Sasaki Lab): “Rapana venosa MHNT” Didier Descouens / CC BY-SA 4.0 (cropped)
- Related lab (Suzuki Lab): “BlackSmoker” W.R. Normark, Dudley Foster / Public domain (cropped)
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