Preprints
https://doi.org/10.5194/esd-2020-77
https://doi.org/10.5194/esd-2020-77

  03 Nov 2020

03 Nov 2020

Review status: this preprint is currently under review for the journal ESD.

Evaluation of convection-permitting extreme precipitation simulations for the south of France

Linh N. Luu1,a, Robert Vautard1, Pascal Yiou1, and Jean-Michel Soubeyroux2 Linh N. Luu et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement, UMR 8212 CEA-CNRS-UVSQ, Université Paris-Saclay and IPSL, Gif-sur-Yvette, France
  • 2Météo-France, Toulouse, France
  • anow at: Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands

Abstract. In the autumn, the French Mediterranean area is frequently exposed to heavy precipitation events whose daily accumulation can exceed 300 mm. One of the key processes contributing to these precipitation amounts is the deep convection, which can be resolved explicitly by state-or-the-art convection-permitting model to reproduce heavy rainfall events that are comparable to observations. However, this approach has never been used in climate simulation for the Mediterranean coastal region. In this research, we investigate the added values of using three ensembles of climate simulations at convection-permitting resolution (approx. 3 km) in replicating extreme precipitation events in both daily and shorter time scale over the South of France. These three convection-permitting simulations are performed with the Weather Research and Forecasting Model (WRF). They are forced by three EURO-CORDEX simulations, which are also downscaled with WRF at the resolution of 0.11° (approx. 12 km). We found that a convection-permitting approach provides a more realistic representation of extreme daily and 3-hourly rainfall simulations in comparison with EURO-CORDEX simulations. Their similarity with observations allows a use for climate change studies and its impacts.

Linh N. Luu et al.

 
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Linh N. Luu et al.

Linh N. Luu et al.

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Short summary
This study downscales climate information from EURO-CORDEX (approx. 12 km) output to a higher horizontal resolution (approx. 3 km) for the south of France. We also propose a matrix of different indices to evaluate the high-resolution precipitation output. We find that a higher resolution reproduces more realistic extreme precipitation events in both daily and sub-daily time scales. Our results and approach are promising to apply to other Mediterranean regions and climate impact studies.
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