IN THE MEGACITY OF TOKYO
Climate impact indicators
Global essential climate variables/indicators used
One high-resolution (10min / 5km) RCM projection from JMA's Meteorological Research Institute
CMIP5 GCMs projections from the Climate Data Store
Regional/local indicators used and produced
Rainfall Intensity-Duration-Frequency (IDF) curves and design rainfalls
Inundation depth variations
Global data to regional/local scale
Step 1: Data collection: compilation of rainfall data from long-term historical observations, a high-resolution RCM projection and several GCM projections from the Climate Data Store
Step 2: Empirical analysis: investigation of how differences in rainfall extremes between two climatological periods at daily resolution are related to corresponding changes at shorter durations.
Step 3: RCM/GCM evaluation: evaluation of short-duration rainfall extremes in terms of e.g. Rainfall Intensity-Duration-Frequency (IDF) statistics in RCM and GCM projections for historical and future periods.
Step 4: Flood risk assessment: local flood risk impact modelling (reference simulations) and evaluation in terms of e.g. inundation depth and frequency, and comparison with corresponding results from the Climate Data Store.
Step 5: Adaptation support: performance evaluation of a “hard measure” (underground reservoir) to reduce future flood risk, for decision support.
Step 6: Outreach: development of an Interactive Climate Atlas and external presentations.