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Motivations Paramétrisation des LiNOx dans Méso-NH

Modélisation du cycle de l’ozone dans la haute troposphère : impact des NOx produits par les éclairs. C. Mari, JP. Pinty, P. Mascart, J. Duron, C. Barthe, JP Chaboureau, F. Gheusi, M. Tressol and T. Fehr (DLR). Motivations Paramétrisation des LiNOx dans Méso-NH

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Motivations Paramétrisation des LiNOx dans Méso-NH

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  1. Modélisation du cycle de l’ozone dans la haute troposphère : impact des NOx produits par les éclairs. C. Mari, JP. Pinty, P. Mascart, J. Duron, C. Barthe, JP Chaboureau, F. Gheusi, M. Tressol and T. Fehr (DLR) • Motivations • Paramétrisation des LiNOx dans Méso-NH • Applications à TOGA-COARE, TROCCINOX et STERAO • Perspectives Méso-NH – Réunion utilisateurs -Toulouse 2005

  2. NOx : catalyseurs indispensables pour la production de l’O3 ! Comprendre le bilan de l’ozone troposphérique

  3. Réduire l’incertitude sur les sources de NOx (Lee et al., 1997)

  4. Cloud Top Updrafts IC -10°C 0°C Downdrafts CG Paramétrisation des LiNOx dans Méso-NH (JP Pinty et T. Fehr) • Lightning frequency (Price and Rind 1992) / Cloud Top Height • IC/CG rate (Price and Rind, 1994) / Cold cloud thickness • P(CG) = 6,7 x 1026 molecules of NO / flash, P(IC) = P(CG) / 10 (Price et al., 1997) • LNOx in updrafts and/or in downdrafts • Perfectly coherent with transport and scavenging

  5. Long-term simulations 1D / TOGA-COARE NO2 (LiNOx) – NO2 (No LiNOx) Upper troposphere: Accumulation Free troposphere: Competition LNOx vs. convective transport PBL: Increase of NOx due to downdraft transport of LNOx

  6. Long-term simulations 1D / TOGA-COARE O3 (LiNOx) - O3 (NO LiNOx) LNOx = local and sporadic event but integrated effect in space and time for ozone

  7. Meso-NH Set-up for regional (low-resolution) simulations EU-TROCCINOX • One single domain (same as forecast mode) • horizontal grid: 102 x 102 points at 30 km resolution • 72 levels: from 40 m (bottom) up to 600 m (top) • Physics • turbulence: CBR TKE 1D scheme • convection: Bechtold’s scheme (incl. scavenging and LiNOx) • microphysics: Pinty-Jabouille, subgrid cloudiness • surface: ISBA and TEB • radiation: ECMWF • Initialization/coupling with ARPEGE-MOCAGE analysis • Lagrangian tracers • Chemistry • ReLACS scheme (37 species) • dry deposition: Wesely • emissions: EDGAR/GEIA (1°x1°) • (except for BB, Yevich and Logan 2003)

  8. 03/03/04 Morning flight survey 03/03/04 Local convection flight in the afternoon 04/03/04 Aged NOx plume in the afternoon

  9. Modelling of LNOx in MNHC at high resolution [ JP Pinty, C. Mari, C. Barthe and JP Chaboureau] The STERAO intercomparison case [courtesy of M. Barth, NCAR) http://box.mmm.ucar.edu/individual/barth/Chem_Convec_Intercomparison/slide1.html

  10. Domain • horizontal grid : 120 x 120 points at 1 km resolution with open LBC • 50 levels : from 70 m (bot) up to 600 m (top) with wave damping • Physics • transport with MPDATA scheme • microphysics: Pinty-Jabouille • electricity: Barthe-Pinty-Molinié • gas scavenging & LiNOx: Mari-Pinty • 3D turbulence (TKE): Cuxart-B-R • Initialization • R/S with 3 warm bubbles (3K) • profiles of HCHO, H2O2, HNO3 • profiles of CO, NOx, O3 • 3 hour run on the 12 LINUX cluster @ LA Set-up of Méso-NH Ice and Wind fields T=1 hour @ Z=10 km

  11. Time = 1 hour Time = 2.5 hours Convective Transport and scavenging 75 ppb<CO<130 ppb HNO3

  12. http://box.mmm.ucar.edu/individual/barth/Chem_Convec_Intercomparison/slide1.htmlhttp://box.mmm.ucar.edu/individual/barth/Chem_Convec_Intercomparison/slide1.html

  13. Perspectives • Modèle couplé transport / lessivage / éclairs / chimie dans la convection, complet et réaliste • Tests de sensibilité 1D (stage de H. Luitjing au LA ) • Amélioration de la paramétrisation: approche plus physique, comparaison avec des simulations explicites de type STERAO (stage post-doctoral C. Barthe)

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