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DATA ASSIMILATION PROGRESS IN SLOVENIA

DATA ASSIMILATION PROGRESS IN SLOVENIA. Benedikt Strajnar. DATA assimilation status at SEA. Operational since March 30 th 2011 Two 54 h production runs per day (00, 12 UTC), sms Clear surface improvement, neutral upper-air scores Improved precipitation cases (convective and stratiform).

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DATA ASSIMILATION PROGRESS IN SLOVENIA

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  1. DATA ASSIMILATION PROGRESS IN SLOVENIA Benedikt Strajnar

  2. DATA assimilation status at SEA Operational since March 30th 2011 Two 54 h production runs per day (00, 12 UTC), sms Clear surface improvement, neutral upper-air scores Improved precipitation cases (convective and stratiform)

  3. Operational suite - sms

  4. 2m T and RH scores for May 2011 Improved surface temperature Dry humidity bias (opposite sign)

  5. Upper-air scores 500 hPa 925 hPa

  6. Revised use of satellite data channel selection based on obs-guess (~0.5 K) and analysis-guess (~0.1 K) Tb bias removal of ch. 13 AMSU-A because of a low model top (5 hPa) temporal blacklisting via run-dependent LISTE_LOC added MSG SEVIRI ch. 7 on top of 2,3

  7. Revised usage of satellite data - scores Temperature Geopotentiel Scores mixed for all variables, degradation for RH Relative humidity Wind speed Wind direction

  8. SEVIRI channel 7 guilty? Channel 3 Channel 7

  9. DFI tuning Modifications of DFI cut-off period (TAUS) Tests of incremental vs. non-incremental filter Tests also with no initialization 6-minute rainfall accumulation

  10. DFI diagnostics

  11. DFI tunning - scores

  12. VARBC impact Varbc tested for a period of 1 month (24h cycling), 1 – 10 hPa predictor switched off Warming-up period was 14 days

  13. Order of surface and upper-air analysis Scores for near-surface T and RH clearly improved if surface is analysed before the atmosphere

  14. Impact of 2 m RH and T assimilation

  15. LANDSAF Albedo assimilation impact Proof of concept at 4.4 km Cold model bias (February 2011, around 5°C) decreased up to 1 K (average ~ 0.2 K) due to LANDSAF albedo estimates

  16. Plans Migrate to cy36 Test and use METOP Test and use IASI Test and use S-Mode high-resolution aircraft data Test surfex Explore possibilities to use Slovenian GPS data Improve vertical resolution Recompute B, choose better periods (summer B matrix at the moment)

  17. Case I: Improved location of afternoon convection in assimilation run

  18. Case II: weak front - precipitation DYN. ADA. ASSIM INCA

  19. Case II: weak front – improved timing DYN. ADA. ASSIM INCA

  20. Case III: Improved location and time of the first thunderstorm Radar accumulation

  21. Case III: Next day (+33 h) ASSIM DYN.ADA.

  22. Case IV: Location of convection S Sloveniainsteadof NE N Adriatic not dry

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