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Yoshimura Lab
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The lab takes on predicting the global water cycle and floods using water isotopes and models.
AboutAbout the lab
Understanding the Earth's water cycle from many angles
Yoshimura Lab studies the water cycle on Earth broadly, investigating how it works from many different angles.
The lab works on the circulation of stable water isotopes, data assimilation that incorporates observational data into models, and the prediction of river flow and floods.
Because the water cycle is strongly affected by climate change, the lab aims to clarify how it works and apply this knowledge to benefit society.
The lab also runs the Kashiwa Campus Science Camp, in which undergraduates take part, as well as open campus events.
Key terms
- Stable isotopes
- Atoms of the same element that differ in mass and exist stably without decaying. Water contains small amounts of molecules with heavy hydrogen or oxygen.
- Data assimilation
- A method that incorporates observational data into a simulation to estimate a more reliable state.
- Climate model
- A computer model that calculates the behavior of the atmosphere, oceans, and land to reproduce and predict the Earth's climate.
NewsLab news
Joint research leads to the development of MIROC6-iso, a climate model that handles water isotopes
Notice of the graduate school entrance exam schedule and an information session for the Department of Natural Environmental Studies
Development of a new method for subseasonal temperature forecasting in collaboration with George Mason University
Held the Kashiwa Campus Science Camp 2025, with undergraduate participants
The lab exhibited at the Kashiwa Campus Open House 2025
ResearchResearch themes
The lab aims to study the Earth's water cycle broadly, clarify how it works from many angles, and contribute to society. Its research covers stable water isotopes, data assimilation, and terrestrial water cycle and flood prediction.
*Illustrative imageTracing the water cycle with water isotopes
The lab develops global and regional climate models that incorporate stable water isotopes, and investigates the mechanisms that change the isotope ratios of precipitation and water vapor, as well as the relationship between isotopes and climate. It also conducts field observations and remote sensing.
*Illustrative imageData assimilation: bringing observations into models
The lab works on data assimilation that incorporates water vapor isotope ratios observed by satellite and ground-based instruments into models, and on isotope reanalysis using the ensemble Kalman filter.
*Illustrative imagePredicting river flow and floods
The lab represents surface water and river flow with models and predicts river discharge, including the effects of human activities and artificial structures. It also researches timely information delivery for disaster prevention and mitigation, as well as climate change and water disaster risk.
MembersFaculty
The members of Yoshimura Lab include faculty, project researchers, administrative staff, doctoral, master's, and undergraduate students, interns, research fellows, and collaborating researchers.As of 2026
- ProfessorKei YoshimuraPublications ↗
- Project LecturerDaisuke TokudaPublications ↗
- Project Assistant ProfessorAlexandre CauquoinPublications ↗
- Project Assistant ProfessorRoman Olson
- Project Assistant ProfessorXiaoyang LiPublications ↗
- Project Assistant ProfessorXiaoxing WangPublications ↗
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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: “A rain shaft partially illuminated by a sun beam next to developing cumulonimbus clouds viewed from the Franklin Farm Village Shopping Center in the Franklin Farm section of Oak Hill, Fairfax County, Virginia” Famartin / CC BY-SA 4.0 (cropped)
- Tracing the water cycle with water isotopes: “Icecore 4” Photo by Lonnie Thompson, Byrd Polar Research Center, Ohio State University. / Public domain (cropped)
- Data assimilation: bringing observations into models: “Artist's rendering of NASA's Aqua Satellite Orbiting Earth” NASA/JPL AIRS Project / CC BY 2.0 (cropped)
- Predicting river flow and floods: “Aerial photograph of 2019 Toki River flood - GSI Saitama 50326” 国土地理院 / CC BY 4.0 (cropped)
- Related lab (Coast and Coastal Environment Lab): “Utoma, Samani, Hokkaido 01” motoGP from Japan. / CC BY 2.1 jp (cropped)
- Related lab (Yamazaki Lab): “Amazon-river-NASA” NASA / Public domain (cropped)
- Related lab (Honda Lab): “US Navy 050102-N-9593M-040 A village near the coast of Sumatra lays in ruin after the Tsunami that struck South East Asia” U.S. Navy photo by Photographer's Mate 2nd Class Philip A. McDaniel / Public domain (cropped)
- Related lab (Sasaki Lab): “Tokyo L7 lrg” Image courtesy Ron Beck, USGS Eros Data Center Satellite Systems Branch / Public domain (cropped)
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