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Impact of the 4D-Var Regional Analysis System on the new Canadian RDPS System

Impact of the 4D-Var Regional Analysis System on the new Canadian RDPS System. Luc Fillion 1 Monique Tanguay 1 , Ervig Lapalme 1 , Mateusz Reszka 2 , Judy St-James 2 , Manon Lajoie 2 , Bin He 1 , Stephen Macpherson 1 , Paul Vaillancourt 1 , Alain Patoine 2 , C é cilien Charette 1

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Impact of the 4D-Var Regional Analysis System on the new Canadian RDPS System

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  1. Impact of the 4D-Var Regional Analysis System on the new Canadian RDPS System Luc Fillion1 Monique Tanguay1, Ervig Lapalme1, Mateusz Reszka2 , Judy St-James2 , Manon Lajoie2, Bin He1, Stephen Macpherson1, Paul Vaillancourt1 , Alain Patoine2, Cécilien Charette1 46th CMOS Congress 26th Conference on Weather & Forecasting 21st Conference on NWP DAII: Data Assimilation Systems Session 1E1 Hyatt Regency Hotel, 1255 rue Jeanne Mance, Montréal, Qc, CAN. H5B1E5 Grand Salon B Tuesday, 29th May 2012, 17h-17h15. 1Meteorological Research Division 2 CanadianMeteorological Center (Development)

  2. NL-High 15-km grid (649x672) NL-High 10-km grid (996x1028) NL-Low/TL/AD 100-km grid (141x141)

  3. Prof1TL ProfiTL ProfNTL 3D-Var MPI 3D-Var MPI GEM TL MPI GEM AD MPI Prof1AD ProfiAD ProfNAD dxTL dxAD ORIGINAL 289 s 210 s 281 s 358 s 3D-Var MPI GEM TL MPI GEM AD MPI dxTL dxAD Prof1TL ProfiTL ProfNTL Reduction 20% REVISED 3D-Var MPI Prof1AD ProfiAD ProfNAD 289 s 281 s 358 s REG-4D : 18 min/ 45 it = 24 sec/it Topologie = 2x(8x8x16)=2048

  4. 4D-Var configuration • Same observations assimilated as in the operational 3D-Var • 15 min binning (45 min for the operational) • 45 iterations(1 Loop)

  5. Number of Assimilated Observations 2011012012 2011051700

  6. Verifications against G2 4D-Var Analyses 48-h DIFF RMSE (m) GZ-250 hPa Summer-2011 Blue: 33 kmDriver is better

  7. Verifications against G2 4D-Var Analyses 48-h DIFF RMSE (m) GZ-500 hPa Summer-2011 Blue: 33 kmDriver is better

  8. WINTER-2011 40 cases 48h Forecast NA+ 15 km

  9. WINTER-2011 40 cases 48h Forecast ARCTIC 15 km

  10. WINTER-2011 40 cases 48h Forecast CANADA 15 km

  11. SUMMER-2011 40 cases 48h Forecast NA+ 15 km

  12. SUMMER-2011 40 cases 24h Forecast/ CANADA 15 km

  13. SUMMER-2011 40 cases 36h Forecast/ CANADA 15 km

  14. SUMMER-2011 40 cases 48h Forecast/ CANADA 15 km

  15. Verifications against G2 4D-Var Analyses 48-h DIFF RMSE (m) GZ-500 hPa Summer-2011 Blue: 4D-Var is better 15 km

  16. Verifications against G2 4D-Var Analyses 48-h DIFF RMSE (m) GZ-250 hPa Summer-2011 Blue: 4D-Var is better 15 km

  17. Verifications against G2 4D-Var Analyses 48-h DIFF RMSE (m) GZ-500 hPa Winter-2011 Blue: 4D-Var is better 15 km

  18. Summary and Conclusions 4D-Var component of RDPS_3.0.0: • Clear improvements in UA scores for both seasons in most of troposphere (Major improvements over Canada and the Arctic) • Optimized 4D-Var still can sustain significant increase in Nb. of Observations assimilated without affecting execution time • Don’t Miss Alain Patoine’s talk on RDPS-10km/4D-Var Wednesday 30th May 14h15, Session 2C3

  19. T= - 3 hr T= 3 hr REG-4D-GLB 100 km, 400x200 Cœur TL Frontière NL REG-4D-LAM 100 km, 104x104 REG-4D-LAM 100 km, 138x138

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