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Contributors: ARQI (C. McLinden, V. Fioletov, M. Moran, V. Bouchet)

Ozone assimilation to improve UV-index and AQHI regional forecast at Environment Canada J. de Grandpr é, Y. Rochon and R. M é nard. Contributors: ARQI (C. McLinden, V. Fioletov, M. Moran, V. Bouchet) AQMAS (S. Gravel) , ARMA (G. Deblonde, L. Fillion),

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Contributors: ARQI (C. McLinden, V. Fioletov, M. Moran, V. Bouchet)

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  1. Ozone assimilation to improve UV-index and AQHI regional forecast at Environment CanadaJ. de Grandpré, Y. Rochon and R. Ménard Contributors: ARQI (C. McLinden, V. Fioletov, M. Moran, V. Bouchet) AQMAS (S. Gravel) , ARMA (G. Deblonde, L. Fillion), RPN (M. Charron, P. Vaillancourt), CMDA (G. Verner)

  2. Outline • Motivation • Global system components • Stratospheric chemical modelling • Chemical measurements • 3D-FGAT variational assimilation • Experiments and evaluation • Nesting approach • Impact on UV-index and AQHI forecasts

  3. Linearized Stratospheric chemistry (LINOZ)(McLinden et al., 2000) q : Ozone mixing ratio cO3 : Column ozone T : Temperature P-L : Photochemical tendency (O) : Climatological values No heterogeneous chemistry

  4. Sample ozone observation distributionTangent point orbit tracks for a 6 hour period (centered about 0 UTC) on 25 July 2008 584 20 partial column layers with ~5 layers in the troposphere ~3.2 km layers Day only Total column amounts Thinning: 1 degree separation Day only cloud free points 5502

  5. Global deterministic meteorological and chemical analysis and forecasting system 48 hr Forecast 48 hr Forecast 48 hr Forecast

  6. Evaluation • Control cycle: Meteorological assimilation + prognostic ozone (winter and summer cycles) • Ozone assimilation cycles: (Use of 6 hrs met analyses + 3D-Var ozone assimilation) • SBUV/2 • GOME-2 • Evaluation of ozone analyses and forecast against ozonesondes below 10 hPa

  7. Jan-Feb, 2009 O-A Ozone (%) SH No Assimilation SBUV/2 July 2008 EQ NH

  8. July, 2008 (WOUDC) LINOZ - WOUDC SBUV/2 - WOUDC SBUV/2 & GOME2 [Against OMI]

  9. GEM-MACH Upper Boundary Nesting • Pilot files (meteo and chem) : [GEM-Global] • GEM-MACH lid : [.1hPa  10 hPa] • GEM4-based version (Staggered Grid) Schematic of nesting (dark grey) and blending (light grey) zones used for UBN implementation. Recent GEM versions use Charney-Phillips vertical staggering with momentum levels dashed and thermodynamic levels solid lines. (Courtesy of R. McTaggart – Cowan)

  10. Benefits of the new system • Improvment of the AQHI forecast • Delivering of global ozone analyses • Improve radiative heating in the global NWP system • Use for temperature retrieval • Research application • UV-index Forecast

  11. Sample ozone observation distributionTangent point orbit tracks for a 6 hour period (centered about 0 UTC) on 25 July 2008 584 1748 165-300 km along track ~ 2.5 km in the vertical (NRT: 0.2 to 68 hPa) 20 usable partial column layers with ~5 ‘no-impact’ tropo. layers ~3.2 km layers Day only Total column amounts Thinning: 1 degree separation Day only cloud free points 5502

  12. Jan-Feb, 2009 Ozone Profiles (Pa) SH SH Ozonesondes No Assimilation (dashed) SBUV/2 assim (dashed) July 2008 EQ EQ NH NH

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