moist processes involved in iop13 and iop16. fanny duffourg olivier nuissier christine lac cnrm-game...
DESCRIPTION
3/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May IOPs studied: IOP13 & IOP16 IOP13 – 14/10/2012: Heavy precipitation over PACA: ~75mm in 6h inland and ~150mm a few kilometers off-shore the Var department in the afternoon 2 distinct precipitating systems: a supercell and a convective line IOP16 – 26/10/2012: Heavy precipitation: up to 100mm in 6h and ~45mm in 1h 2 precipitating systems : a MCS crossing the Gulf of Lion in the morning and a MCS reaching the Var department in the afternoon IOP13 – 14/10, 18 UTCIOP16 – 26/10, 18 UTC6h-accumulation (1/10mm)TRANSCRIPT
Moist processes involved in IOP13 and IOP16.
Fanny DUFFOURG Olivier NUISSIER
Christine LAC
CNRM-GAME / Météo-France & CNRS
HyMeX ST-WV meeting, Toulouse, France, 15 May 2014
2/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
Objectives and methodology
Two objectives: Understanding the moist processes involved in the triggering and
organisation of the precipitating systems and their interactions with the ambient flow.
Evaluation of their representation in the numerical simulations.
Analysis of the precipitating systems observed during HyMeX SOP1 IOPs 13 and 16: Numerical simulations with Meso-NH Identification of the moist processes Validation of the simulation and the processes identified against
the extended HyMeX observational dataset
3/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
2 IOPs studied: IOP13 & IOP16
IOP13 – 14/10/2012: Heavy precipitation over PACA: ~75mm in 6h inland and ~150mm a
few kilometers off-shore the Var department in the afternoon 2 distinct precipitating systems: a supercell and a convective line
IOP16 – 26/10/2012: Heavy precipitation: up to 100mm in 6h and ~45mm in 1h 2 precipitating systems : a MCS crossing the Gulf of Lion in the
morning and a MCS reaching the Var department in the afternoon
IOP13 – 14/10, 18 UTC IOP16 – 26/10, 18 UTC6h-accumulation(1/10mm)
4/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
Numerical simulation set-up
Simulations with the non-hydrostatic research model Meso-NH: Initialisation and forcing at lateral boundaries with AROME-WMED
analyses, forecasts and reanalyses Domain size Resolution of the simulations – 2.5km and 500m in progress Advection scheme, turbulence
Very sensitive to all settings
Meso-NH simulation domains
5/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
First assessment of the quality of the simulations
IOP13:o Supercell between 13:00 and 15:30 UTC not reproducedo Other convective systems quite well simulated
IOP16:o MCS over the Gulf of Lion not reproduced o MCS moving towards the Var quite well simulateduntil it reaches the coast
IOP13 – 14/10, 17 UTC IOP16 – 26/10, 12 UTC
6/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
Comparison with HyMeX observations – IOP13
Levant wind profilerWater vapour mixing ratio from BASIL lidar
Simulated radar reflectivities – 14/10, 17 UTC
Simulated θe and horizontal wind at 925hPa – 14/10, 17 UTC
OBSERVATIONS
SIMULATIONS
324 K
7/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
Comparison with HyMeX observations – IOP16
Levant wind profilerRASTA cloud radarSimulated radar reflectivities – 26/10, 12 UTC
Simulated θe and horizontal wind at 925hPa – 26/10, 12 UTC
OBSERVATIONS
SIMULATIONS
326 K
8/8 - HyMeX ST-WV meeting - F. Duffourg - Toulouse, France, 15 May 2014 -
Further work
Additional Meso-NH simulations with a 500m horizontal resolution : more accurate description of the precipitating systems.
Identification of the processes triggering the convection and organising the precipitating systems: sensitivity and impact on the ambient flow, interactions between dynamics and microphysics.
Building of the moisture feeding: origin of the water vapour and evolution of the air masses.
Comparison with all available observations: In-cloud measurements (RASTA, F20) and 3D radar composites of
reflectivity, doppler winds and hydrometeor classification. Ambient flow measurements from lidars, GPS, profilers,
radiosoundings, balloons, ATR flights, surface observations, ...
Thank you !