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Impact study of MAP IOP2B observations on the mesoscale numerical simulation

This study examines the impact of additional MAP IOP2B observations on mesoscale numerical simulations. The most intense rainfall case during the MAP SOP is chosen for investigation, comparing accumulated precipitation, time evolution of precipitation, wind, orographic flow, and thermodynamic structure with radar and radiosonde observations.

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Impact study of MAP IOP2B observations on the mesoscale numerical simulation

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  1. Impact study of MAP IOP2B observations on the mesoscale numerical simulation Y. WANG ZAMG, Austria

  2. MAP case, ALADIN impact studies • MAP-IOP2B numerical simulations with ALADIN and ECMWF 4D-VAR assimilation system, observation type & assimilation experiments: 1. European windprofile 2. Other additional observations; high-resolution radiosondes, aircraft, dropsonde, surf. observation 3. MAP-reanalysis

  3. MAP IOP2B Case study • MAP field experiment Observations 16European windprofiles, high-resolution raidosoundings, aircraft data, dropsondes and surface observations • Assimilation experiments (Keil and Cardinali 2003) ECMWF assimilation system T511/159L60, cycle 24R3 1. e9mi: MAP-reanalysis, 4 windprofiles are denied after QC. 2. e9ex: control experiment, excluding all MAP observations 3. e9jr: same as e9mi, but without any European windprofiles 4. e9cp: same as e9mi, but with all the European windprofiles

  4. MAP IOP2B case • MAP IOP2B is the most intense rainfall case observed during the MAP SOP. • From 00UTC,19 – 06UTC,20. 09.1999 • Meteorological situation: A baroclinic trough associated with cold front was approaching Alps from the west, low level moist Mediterranean air was advected toward the southern Alps.

  5. MAP simulation with ALADIN • ALADIN-AUSTRIAover Central Europa, 9.6km/41 levels hydrostatic, convection parametrization,etc • IC and LBC provided by the analysis experiments • Model started at 00utc, 19/09/99, and integrated to 54 hours,06utc,21/09/99

  6. Impact on the initial condition

  7. Accumulated precipitation 19/09

  8. Accumulated precipitation 20/09

  9. Accumulated precipitation 20/09

  10. Time evolution of the rainfall

  11. Convection

  12. Orographic flow modification

  13. Wind

  14. Conclusion We have studied the impact of the additional MAP observations on the meso-scale numerical simulation. MAP IOP2B, the most intense rainfall case during SOP was chosen for the investigation. Accumulated precipitation, time evolution of the area averaged precipitation, wind, orographic flow, thermodynamic structure are compared with the radar, radiosounding observations.

  15. Conclusion • The additional MAP observations, high resolution upper air soundings, aircraft,european dropsondes, have significant influence on the simulation. • The impact of the windprofile is strong. • MAP-reanalysis doesn‘t provide always the best simulation • The after QC denied windprofiles have remarkable impact on the simulation. Sometimes it is very positive.

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