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Scientific Interests

Stable water isotopes circulation

• ・Numerical modeling of global and regional isotope circulation.
• ・Minutes to interannual variations of stable water isotopes ratio in precipitation and vapor, and their quantitative interpretation as proxies.
• ・Estimation and analysis of precipitation source regions
• ・Relationship between isotopes and climate, and mechanism of appearance of the past climates’ isotopic proxies
• ・In-situ and remote-sensing observation.

Dynamical downscaling

• ・Development and improvement of AGCM and RCM
• ・Methodology development of the dynamical downscaling.
• ・Past and future changes in meso-scale climate and extremes.
• ・Application studies on current and future water and energy issues.

Data assimilation

• ・”Isotope Reanalysis”.
• ・Ensemble Kalman filtering.
• ・Data assimilation of vapor isotopes observed by the satellite and ground-based spectroscopy sensors.

Terrestrial hydrologic cycles and impact assessment

• ・Land surface modeling, a macro scale rain-runoff mechanism in particular.
• ・Development of a river discharge simulation model with anthropogenic activity.
• ・Prediction of river discharge and other terrestrial hydrologic variables for prevention of hazard and early warning.
• ・Risk analysis of water-related hazards in the global warming scenarios.
• ・A case study of a water-related hazard

Biogeochemical cycle

• ・Modeling and data assimilation for global CO2 cycle.
• ・Estimation of pollution source with biogeochemical tracers
• ・Modeling of atmospheric transport with chemical process.