|ABSTRACT||The observed intensification of extreme precipitation events occurring over the French Mediterranean area is significant over the 1961-2015 period (Ribes et al, 2018).
Up to now, climate models with too coarse resolution and deep convection parametrization failed to represent accurately the meteorological key processes highly linked with topography and various small-scale phenomena, especially meso-scale convective systems which are responsible for the heaviest extremes in the Mediterranean area.
With the recent computer power increase, we start implementing convection-permitting models at climate scale. The Meteo-France one, called Arome-Climat with a horizontal resolution of 2.5km, inherits from most of the advances of the Numerical Weather Prediction model. We run past climate simulation over the last 15 years driven by ERAInterim (80km) using an Aladin-Climat-12.5km-simulation as an intermediate step. The domain (common CORDEX-FPS-Convection domain, 1300km1500km, centred on the Alps) includes the north-western part of the Mediterranean basin. In a first step, we study the ability of the model to reproduce the high precipitation events and try to quantify the internannual variability and the added value compared to the driving model. In a second step, we try to recover the last 15 years observed trends in terms of intensity (and discuss the Clausius-Clapeyron relationship), frequency and properties (spatial coverage and severity index).|