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STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION

STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION. V. Marécal 1 , E. D. Rivière 1 , G. Held 2 , S. Cautenet 3 , S. Freitas 4 and N. Larsen 5 1 LPCE, Orléans, France, vmarecal@cnrs-orleans.fr

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STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION

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  1. STUDY OF THE IMPACT OF THE 8 FEB 2001 CONVECTIVE SYSTEM ON THE UTLS AIR COMPOSITION V. Marécal1, E. D. Rivière1, G. Held2, S. Cautenet3, S. Freitas4 and N. Larsen5 1LPCE, Orléans, France, vmarecal@cnrs-orleans.fr riviere@cnrs-orleans.fr 2 IPMet, Bauru, Brazil 3 LAMP, Clermont-Ferrand, Fance 4 CPTEC, Cachoeira Paulista, Brazil 5 DMI, Copenhagen, Denmark 1

  2. « overshoot » stratosphere UTLS 17 km TTL tropopause 11 km deep convection free troposphere Boundary layer emissions 0 km Mid-latitudes Tropics SCIENTIFIC OBJECTIVE What is the local impact of deep convection on the TTL composition ? What is the relative contribution of transport and chemistry ? TOOLS: - 3D meso-scale simulation with on line chemistryusing the RAMS-Chemistry model - Available meteorological and chemistry data 2

  3. CASE STUDY: THE 8 FEB 2001 CONVECTIVE SYSTEM BAURU RADAR REFLECTIVITY MEASUREMENTS 22 : 01: 16 8 FEB 2001 21 : 01: 16 8 FEB 2001 20 : 01: 16 8 FEB 2001 19 : 01: 16 8 FEB 2001 18 : 01: 16 8 FEB 2001 02 : 01: 16 9 FEB 2001 01 : 01: 16 9 FEB 2001 00 : 01: 16 9 FEB 2001 23 : 01: 16 8 FEB 2001 17 : 01: 16 8 FEB 2001 3

  4. STEP 1: METEOROLOGICAL SIMULATION Grid 1 • SIMULATION SETUP • 42 hours from 2001/02/07 12UT • 2 nested grids • Grid 1: 20 km horizontal resolution • Grid 2: 4 km horizontal resolution • - 61 vertical levels from surface to 30km altitude(500m in the UTLS) • - Initialisation from ERA40 analysis and radiosoundings • Subgrid scale convective parameterization for Grid 1 from Freitas et al (2004) Grid 2 4

  5. STEP 1: METEOROLOGICAL SIMULATION Surface rainfall accumulated from 2001/02/08 15UT to 2001/02/09 00UT from the Bauru radar from the RAMS model 5

  6. STEP 2: SIMULATION WITH ON-LINE CHEMISTRY • CHEMISTRY SETUP • 29 species and 71 reactions • - Gaseous and aqueous chemistry • Surface emissions of ozone precursors • Parametrization of NOx production by lightning • Initialisation from MOCAGE (Météo-France) global fields 6

  7. DOES THE MODEL PRODUCE REALISTIC OZONE PROFILES ? TTL 2004 DMI O3 measurement range 7

  8. 49 416 ch = 11 299 103 733 38 23 % STE 17 % 13 km flux WHAT ARE THE MAIN CONTRIBUTIONS TO THE OZONE BUDGET IN THE TTL ? Ozone budget in the TTL between Feb. 8 @ 00UT and Feb 9. @ 00UT z 30 km q = 380 K 13 km N Grid 2 w E (* 1030 molec of O3) S 8

  9. WHAT ORIGINATES THE STRATOSPHERE-TROPOSPHERE EXCHANGE ? Horizontal cross-section of vertical velocity at 17.5 km 1200 UT 2200 UT Wave activity generated by deep convection originates STE 9

  10. WHY THE CONTRIBUTION OF CHEMISTRY TO THE OZONE BUDGET IN THE TTL IS WEAK ? TTL TTL TTL Accumulated O3 production in ppbv (Grid 2 average) CO in ppbv (Grid 2 average) NOx in ppbv (Grid 2 average) 10

  11. 17 km Convective outflow 13 km LNOx 0 km CONCLUSION stratosphere Wave from convection  STE UTLS Large scale flow Additional O3 prod TTL tropopause O3 prod Additional O3 prod deep convection free troposphere Boundary layer O3 precursor emission Tropics 11

  12. FUTURE WORK • *FURTHER ANALYSIS OF THE 8 FEB 2001 CASE STUDY: • ROLE OF SOLUBLE SPECIES (OH, HNO3) • SIMILAR ANALYSIS ON A LONGER SIMULATION * IMPLEMENTATION OF THE CPTEC TRAJECTORY CODE FOR CHEMICAL SPECIES * IMPLEMENTATION OF THE RTTOV CODE FOR « MODEL TO SATELLITE » COMPARISONS * SIMULATIONS FOR THE 13-14 FEB 2004 CASE STUDY (SF2) AND THE 24 FEB 2004 CASE STUDY (SF4) 12

  13. GOES image 13 feb 2004 1715UT Vertically-integrated total condensate in mm from model simulation: 13 feb 2004 1700UT SIMULATION OF THE 13-14 FEB 2004 CASE STUDY Vertically-integrated total condensate in mm from model simulation: 14 feb 2004 0500UT Time shift possibly related to initialisation from ECMWF analysis Planned work: initialisation with NCEP or CPTEC products 13

  14. MANY THANKS TO Ana Maria Gomes and IPMet collaborators Gilles Foret - LaMP INMET Vincent-Henri Peuch – Météo-France Jean Luc Athié – LA Publications submitted to ACDP: Modelling study of the impact of deep convection on the UTLS air composition. Par I: Analysis of ozone precursors. Marécal et al. Modelling study of the impact of deep convection on the UTLS air composition. Par II: Ozone budget in the TTL. Rivière et al. 14

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