PhD: Triggering and stationarity factors for Mediterranean Heavy Precipitating Systems in the HyMeX SOP1 framework.

This PhD aims to improve our understanding of the fine-scale processes involved in the triggering and the quasi-stationary organisation of the Mediterranean heavy precipitating systems, as well as our knowledge of their interactions and their sensitivity to the environment. This PhD will also offer the opportunity to diagnose and validate the representation of these processes in the fine-scale numerical weather prediction models. It will take place within the framework of the exploitation program of the HyMeX campaign.

The methodology of this PhD will consist in:

– simulating at sub-kilometric scales (100 to 500 meters) with the French research model Meso-NH some specific HPEs of the SOP. AROME-WMED reanalyses will provide initial and lateral boundary conditions for the Meso-NH simulations. We will address highly documented SOP1 situations of heavy precipitation such as IOP12 (11-12 Oct.), IOP13 (14-16 Oct.),
IOP15b (21-22 Oct.) and IOP16a (25-27 Oct.).
– evaluating at fine-scale these simulations thanks to the very-high density dataset of the HyMeX campaign.
– defining an experimental set-up dedicated to sub-kilometric scale simulations of heavy precipitating events. This will be performed by studying the sensitivity of the representation of the mechanisms of convection to some key physical parameterizations (turbulence, microphysics) and/or to the mesoscale initial conditions. The representation of the mechanisms in the simulations will be studied by comparing with the HyMeX observations.
– analysing at fine-scale the forcing mechanisms for the triggering and the quasi-stationary factors in the organisation of deep convection. Special attention will be paid to characterise the physical process interactions and their sensitivity to the meteorological environment.

Diagnostic tools available in Meso-NH (convection diagnoses, lagrangian trajectories, budgets,…) will allow to characterise the low-level circulation organisation over the Sea as well as to identify the sources of lifting for deep convection. A downscaled analysis will thus be carried out up to the scale of the convective cell. The comparative study of different HPEs will also help to document the sensitivity of the forcing mechanisms to the meteorological environment.

Tota la informació aquí: PhD2013 HYMEX

Laboratory:

CNRM-GAME / Météo-France & CNRS (UMR 3589)

Speciality :

Climate, Ocean and Atmospheric Sciences.

Name of the supervisors:

Olivier NUISSIER and Fanny DUFFOURG

Contact information:

Olivier NUISSIER – +33561079865 – olivier.nuissier@meteo.fr
Fanny DUFFOURG – +33561079344 – fanny.duffourg@meteo.fr

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