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Méso-NH-Chemistry for 1st escompte modelling exercise workshop Marina COVRE (DP/SERV/ENV)

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

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Méso-NH-Chemistry for 1st escompte modelling exercise workshop Marina COVRE (DP/SERV/ENV)

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  1. Méso-NH-Chemistry for 1st escompte modelling exercise workshop Marina COVRE (DP/SERV/ENV)

  2. 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

  3. Laboratoire d’Aérologie • Anelastic non-hydrostatic , limited area model, two-way grid nesting technique • Variables u,v,w,q,rv,rc,rr,rg,rs,ri,rh,TKE • Advection 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

  4. MNHC : chemical transformations on-line • 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

  5. 2 - Model configuration 50 vertical levels : 36 < 3000m, up to 16000 m 2 grid-nested domains Stereographic projection

  6. 720 Km 720 Km

  7. MOdèle de Chimie Atmosphérique à Grande Echelle 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

  8. 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

  9. 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

  10. 6 - Comparisons • 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

  11. 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

  12. 12 H 11 H 09 H 10 H 07 H 08 H 9 – ResultsSurface Ozone field 24/06

  13. 13 H 14 H 15 H 16 H 17 H 18 H 9 – ResultsSurface Ozone field 24/06 PM

  14. Increasing values after 12 TU But too high 9 – ResultsLidar Alto 24/06/01 Correct vertical structure at end of day

  15. 9 – ResultsLidar Alto 25/06/01 Vertical structure in good agreement

  16. 24/06 25/06 26/06 9 – ResultsSurface station POI2b : Cadarache

  17. 9 – ResultsSurface station POI2b : Marseille 24/06 25/06 26/06

  18. 9 – ResultsSurface station POI2b : Fos & Avignon

  19. 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)

  20. Still to do … • 3D files comparisons • Aircrafts, radiosounding, lidar comparisons • Other IOPs (emissions inventories)

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