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Ooki Lab (Marine Environmental Science Division)
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A lab that follows the cycling of materials in the ocean and sea ice, from the Arctic to the Antarctic, through observations and chemical analysis.
AboutAbout the lab
Tracing material cycling in the ocean and sea ice.
The Marine and Sea Ice Biogeochemistry Lab is made up of the groups of Prof. Ooki and Prof. Nomura.
It studies the cycling of chemical substances in the ocean and sea ice and its effects on marine and atmospheric environments, in seas ranging from the Arctic Ocean to the Southern Ocean.
Prof. Ooki's group focuses on organic gases emitted by marine plants and on the cycling of iodine and nutrients, conducting observations in Funka Bay and investigating the fate of carbon in seaweeds such as kelp.
Prof. Nomura's group conducts field observations on sea ice in freezing seas such as the Antarctic, the Arctic, and the Sea of Okhotsk, studying the uptake and release of greenhouse gases such as carbon dioxide.
Key terms
- Blue carbon
- Carbon taken up by marine plants and trapped in the ocean or on the seafloor. It is attracting attention as a measure against global warming
- Organic gases
- Carbon-containing substances that readily become gases. They are produced by marine plants and released from the ocean into the atmosphere
- Sea ice
- Ice formed when seawater freezes. In winter it widely covers the surface of the Antarctic, the Arctic, and the Sea of Okhotsk
- Greenhouse gases
- Gases such as carbon dioxide that absorb heat emitted from Earth's surface and warm the planet
ResearchResearch themes
The lab aims to clarify the cycling of chemical substances involving marine organisms and its effects on the environment. Using observations and chemical analysis, it studies the fate of carbon held by seaweeds such as kelp, organic gases dissolved in seawater, and material cycling in Funka Bay. It also studies how freezing seas affect the uptake and release of greenhouse gases such as carbon dioxide and the cycling of materials such as nutrients and carbon. In addition to field observations on sea ice, the lab conducts experiments in which seawater is frozen in a cold room.
*Illustrative imageBlue Carbon of Kelp
The lab is pursuing research based on the view that, to evaluate how effectively large macroalgae such as kelp trap carbon in the ocean, it is necessary to track not only carbon but also the flow of nutrient components such as nitrogen and phosphorus at the same time.
*Illustrative imageSurveying Salmon and Kelp Aquaculture Areas
The lab conducts environmental surveys of aquaculture areas for the king salmon and makombu kelp farming promoted by Hakodate City and Hokkaido University (the Marical Project). It focuses on changes in the carbon budget associated with aquaculture.
*Illustrative imageCold Seas Absorb Carbon Dioxide
Cold polar seas readily dissolve atmospheric carbon dioxide. Dense water formed when the sea freezes is thought to sink into the deep ocean together with the carbon dioxide it has absorbed.
*Illustrative imageGas Exchange Between the Atmosphere and the Ocean in Sea Ice Zones
Sea ice has long been regarded as a barrier that blocks the exchange of materials between the atmosphere and the ocean. Observations on sea ice have revealed that it plays an important role in the exchange of greenhouse gases and other substances.
MembersFaculty
The Ooki-Nomura Lab consists of faculty members, JSPS Special Assistant Professors, and PhD, master's, and undergraduate students.As of 2026
- ProfessorAtsushi Ooki
- ProfessorDaiki Nomura
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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: “Uchiura-bay Yakumo” Bakkai at Japanese Wikipedia / CC BY-SA 3.0 (cropped)
- Blue Carbon of Kelp: “Algues laminaires en Bretagne (Ifremer )” Olivier Dugornay / CC BY 4.0 (cropped)
- Surveying Salmon and Kelp Aquaculture Areas: “Shirigai Fish Pen” おいもたろう
/ CC BY-SA 4.0 (cropped) - Cold Seas Absorb Carbon Dioxide: “Sea Ice in Sea of Okhotsk (MODIS )” MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
- Gas Exchange Between the Atmosphere and the Ocean in Sea Ice Zones: “Pancake Ice Forming into Floes off Cape Evans” Herbert Ponting / Public domain (cropped)
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