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Ozone assimilation to improve UV-index and AQHI regional forecast at Environment Canada J. de Grandpré, Y. Rochon and R. Ménard Contributors: ARQI (C.

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Presentation on theme: "Ozone assimilation to improve UV-index and AQHI regional forecast at Environment Canada J. de Grandpré, Y. Rochon and R. Ménard Contributors: ARQI (C."— Presentation transcript:

1 Ozone assimilation to improve UV-index and AQHI regional forecast at Environment Canada J. 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 Variational chemical data assimilation at EC slide 2 9 December 2011 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

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

5 Variational chemical data assimilation at EC slide 5 9 December 2011 Sample ozone observation distribution Tangent point orbit tracks for a 6 hour period (centered about 0 UTC) on 25 July Total column amounts Thinning: 1 degree separation Day only cloud free points 20 partial column layers with ~5 layers in the troposphere ~3.2 km layers Day only

6 Global deterministic meteorological and chemical analysis and forecasting system 48 hr Forecast

7 Variational chemical data assimilation at EC slide 7 9 December 2011 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

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

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

10 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)

11 Variational chemical data assimilation at EC slide 11 9 December 2011 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

12 Variational chemical data assimilation at EC slide 12 9 December 2011 Sample ozone observation distribution Tangent point orbit tracks for a 6 hour period (centered about 0 UTC) on 25 July Total column amounts Thinning: 1 degree separation Day only cloud free points 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

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

14 Variational chemical data assimilation at EC slide 14 9 December 2011


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