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The BALTEX BRIDGE Campaign (BBC) cases

The BALTEX BRIDGE Campaign (BBC) cases. Susanne Crewell, Nicole van Lipzig, Wenchieh Yen Meteorological Institute Munich. Contributions. Felix Ament, University of Bonn Lokal-Modell (LM) of DWD, x = 1.1 to 7 km - horizontal resolution, - different cloud schemes

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The BALTEX BRIDGE Campaign (BBC) cases

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  1. The BALTEX BRIDGE Campaign (BBC) cases Susanne Crewell, Nicole van Lipzig, Wenchieh YenMeteorological Institute Munich

  2. Contributions • Felix Ament, University of BonnLokal-Modell (LM) of DWD, x =1.1 to 7 km- horizontal resolution, - different cloud schemes • Ulrika Willén, SMHIRCA, x = 18 km - vertical resolution (24, 40, 60 layers) • Erik van Meijgaard, KNMIRACMO, x = 18 km - different physic packages • Jean-Pierre Charboreau, Laboratoire Aerologique, Méso-NH, x = 2.5 km

  3. BALTEX BRIDGE Campaign (BBC) Crewell, S., et al, The BALTEX Bridge Campaign: An integrated approach for a better understanding of clouds, Bull. Amer. Meteor. Soc. , in press.

  4. 0 UTC, 23 Sep 01 0 UTC, 24 Sep 01 23 September 2001 sea levelpressure wind at850 hPa Geopotentialheight [gpm]at 500 hPa IWV [kg m-2] Cabauw .

  5. 23 September 2001 MODIS 10:40 UTC Cabauw Radiosoundings, μ- & IR radiometer, lidar super site

  6. 23 September 2001: aircraft 1.4 km 10 km CASI observations by FU Berlin, Radiances at 753 nm

  7. 23 September 2001: LWC Satellite retrieval from KNMI

  8. 23 September 2001 Cloud radar - refectivity- velocity- LDRLWP Lidar Radiosonde

  9. 23 September 2001: cloud radar Markus Quante, GKSS

  10. 23 September 2001: LWC Löhnert, U., S. Crewell, C. Simmer, 2004: An integrated approach towards retrieving physically consistent profiles of temperature, humidity, and cloud liquid water, J. Appl. Met.,

  11. 7:58 to 9:57 UTC mean LWC adiabatic 90 % percentile aircraft meas. in the vicinity of the measurement site (< 5 km) LWPIPT= 64 g m-2 LWPadiab= 100 g m-2 23 September 2001: LWC

  12. 23 September 2001: aircraft Aircraft observations by Merlin, Partenavia, Cessna GKSS

  13. Cloud cover at Cabauw RACMO with 24 layersand ECHAM4 Physics RACMO with 40 layersand ECMWF physics Ulrika Willen Model comparison

  14. Cloud cover at Cabauw Ulrika Willen Model comparison

  15. RACMO (ECHAM4) RACMO (ECMWF) LM LWC Model comparison: Cabauw site RCA Méso-NH

  16. LM and Precipitation LWP, 23 September 12 UTC Cabauw Frequency of occurence [%] Black contours show edgesof precipitation areas 0 0-0.1 0.1 -1 > 1 Precipitation [mm/h]

  17. 0 UTC, 23 Sep 01 0 UTC, 24 Sep 01 21 May 2003 sea levelpressure wind at850 hPa Geopotentialheight [gpm]at 500 hPa IWV [kg m-2] Cabauw

  18. 21 May 2003

  19. MODIS, 10:01 UTC 21 May 2003 LM, LWP 11 UTC 0.3, 0.6, 0.9 kg m-2 Cabauw Marc Schröder over land

  20. wind speed wind direction temperature LM LWC domain average 11 UTC, Top 2700 m 5:15 8:30 11:20 14:17 virt. pot. temp. spec. humidity rel. humidity (+ice sat)

  21. 21 May 2003

  22. 21 May 2003 ACTOS systemHolger Siebert IfT Leipzig

  23. 21 May 2003

  24. 21 May 2003

  25. Cloud cover at Cabauw Model comparison

  26. Cloud cover at Cabauw different vertical resolutionsfor RCA model Ulrika Willen Model comparison

  27. Conclusions • two well documented cases (stratiform – convective) from BALTEXBRIDGE Campaigns • all observations (also for all other CLIWA-NET days) are available on request and soon using anonymous ftp at bbc.knmi.nl cliwa_dvd • all models seem to represent synoptic situation well • for stratiform case Meso-NH reproduces low level stratus cloud best • for convective case statistical analysis has to be made • Lokal-Modell has problems with contiguous clouds and the production ofslight precipitation

  28. 400 200 0 10 5 0 23 September 2001: Wind

  29. 23 September 2001 low-pressure system, still pronouncedly present in the upper air, moved to Denmark on the 21st, but it crossed the Netherlands again on the 23rd. 21-22 Sep: cloudy with (from time to time heavy) showers. 23 Sep: low-level clouds in the morning transferring into shallow cumulus in the early afternoon. MODIS 10:40

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