méso-nh-chemistry for 1st escompte modelling exercise workshop marina covre (dp/serv/env)
DESCRIPTION
Méso-NH-Chemistry for 1st escompte modelling exercise workshop Marina COVRE (DP/SERV/ENV). 1 – Model description 2 – Model configuration 3 – Boundary conditions 4 – Meteorology 5 – Emissions 6 – Comparisons to observations & 3D files 7 – Aerosol 8 - Model strengths & weakness - PowerPoint PPT PresentationTRANSCRIPT
Méso-NH-Chemistry for
1st escompte modelling exercise workshop
Marina COVRE (DP/SERV/ENV)
1 – Model description
2 – Model configuration
3 – Boundary conditions
4 – Meteorology
5 – Emissions
6 – Comparisons to observations & 3D files
7 – Aerosol
8 - Model strengths & weakness
9 - Results
10 – Comments on exercise’s website
Laboratoire d’Aérologie
Anelastic non-hydrostatic , limited
area model, two-way grid nesting
technique
Variables u,v,w,rv,rc,rr,rg,rs,ri,rh,TKEAdvection scheme : eulerian
Turbulence 1D (1.5 order)
Kain & Fritsch Convection
ECMWF Radiation scheme
Soil-Biosphere exchanges, Town
budget
Temporal resolution : « leapfrog »
scheme (t-dt to t+dt)
http://www.aero.obs-mip.fr/mesonh
Chemical scheme : RELACS (reduction of RACM),
37 prognostic species, 128 equations
Dry deposition fluxes : wesely algorithm (Tulet,
2000)
Wet deposition by convective and stratiform
precipitations (not important for Escompte)
Photolysis rates : look-up table using TUV model
MNHC : chemical transformations on-line
2 - Model configuration
2 grid-nested domains
Stereographic projection
50 vertical levels :
36 < 3000m, up to 16000 m
MOdèle deChimieAtmosphérique àGrandeEchelle
3 & 4 – Boundary conditions
Meteorological & Chemical boundary conditions given by MOCAGE, time step : 3 hours
Meteorology from ARPEGE Analysis (0.25°, 7 levels in boundary layer)
No data assimilation
SST modifications for IOP2
Initialization 24/06 00H for IOP2
5 - Emissions
Escompte domain :
Escompte inventory emissions (LPCA/Airmaraix)
170 species 26 species (RACM scheme)
UTM projection lat, lon information
Kg/km2 ppp.m/s
Height & spatial informations not used for point sources
Time resolution : 1 hour
5 - Emissions
Outside Escompte domain :
Genemis inventory (9Km resolution, Middleton species)
Time resolution : 1 hour for 1 typical day
Biogenic emissions (Solmon and al, 2001), linked to soil exchanges and radiation
• To observations– Orography data : resolution 1 Km differences between height of model & observed
(about 30m only)
– Horizontal interpolation, but no vertical interpolation
• To 3D files– Interpolation to regular grid not usual 3D files not ready
6 - Comparisons
7 – Aérosol
MNHC does not treat aerosol
8 – Model strenghs & weakness
Chemistry on-line
(coherence)
Numerous vertical levels
Numerous types of vegetation
(93 on Europe, res. 1Km)
But important calculation time
Dry deposition studied for global scale
9 – ResultsLidar Alto 24/06/01
Increasing values after 12 TU
But too highCorrect vertical structure at end of day
10 – Exercise website
Easy too use, but not with netscape
An interesting tool to test results (possibility to up-load and down-load files, like Ensemble website)
Still to do …
• 3D files comparisons
• Aircrafts, radiosounding, lidar comparisons
• Other IOPs (emissions inventories)
