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Extreme precipitations and their relationship with temperature over Japan

National Research Institute for Earth Science and Disaster Prevention, Sridhara Nayak National Research Institute for Earth Science and Disaster Prevention, Koji Dairaku National Research Institute for Earth Science and Disaster Prevention, Noriko Ishizaki Meteorological Research Institute, Izuru Takayabu Rissho University, Asuka Suzuki-Parker Introduction: Recent studies have argued that the extreme precipitation intensities are increasing in many regions across the globe due to atmospheric warming, which may cause the natural disasters such as floods, coastal erosion, landslides, water hazards etc. more frequently (IPCC 2007, 2012). This argument is based on the principle of Clausius-Clapeyron (CC) relationship which states that atmosphere can hold more moisture in warmer air temperature (~7%/°C). Past studies (e.g., Dairaku and Emori, 2006; Lenderink and van Meijgaard 2008; Utsumi et al., 2011; Westra et al., 2014; Nayak et al., 0) indicate that extreme precipitation intensities increases at a rate of ~6%/ o C globally and at a rate of ~7%/ o C over Netherlands, Belgium, Switzerland, Australia and few regions of Japan. Most of the studies, in this context, have been based on observation datasets (e.g., Utsumi et al., 2011) to examine the relationship of extreme precipitations with temperature and their connection to CC scaling behavior, while few studies are conducted with GCM and RCM experiments. In our study, we analyzed multi-GCMs x multi-RCMs experiment results to investigate the individual model behavior as well as the model uncertainty in reproducing the extreme precipitations and their relationship with temperature. Whether does the model simulated relationship follow observed CC relationship and what are the projected future changes in the relationship due to regional/ global climate change?