What added value of CNRM-AROME convection-permitting regional climate model compared to CNRM-ALADIN regional climate model for urban climate studies ? Evaluation over Paris area (France)

The convection-permitting regional climate model CNRM-AROME was applied on a spatial domain restricted to the northern half of France for analyzing its performances in simulating urban Paris region, and potential added value compared CNRM-ALADIN. In addition fine horizontal resolution (2.5 km 12.5 CNRM-ALADIN), has advantage integrating canopy TEB into land-surface modeling system. A hindcast simulation performed past period 2000–2017, following an evaluation configuration which driven by CNRM-ALADIN, itself ERA-Interim reanalyses. Long-term gridded observations with kilometric allowed scale atmospheric variables simulated both models. They showed particular significant overestimation spring precipitation, but improvement summer precipitation Above all, thanks use dedicated model, shown offer heat islands, mapping heat-warming areas, representing effects city precipitation. It is promising tool diagnose climatic impact indicators at scale, their evolution changing climate.