1. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 The BALTEX BRIDGE Campaign (BBC) cases Susanne Crewell, Nicole van Lipzig, Wenchieh Yen Meteorological Institute Munich

2. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Contributions  Felix Ament, University of Bonn Lokal-Modell (LM) of DWD,  x =1.1 to 7 km - horizontal resolution, - different cloud schemes  Ulrika Willén, SMHI RCA,  x = 18 km - vertical resolution (24, 40, 60 layers)  Erik van Meijgaard, KNMI RACMO,  x = 18 km - different physic packages  Jean-Pierre Charboreau, Laboratoire Aerologique, Méso-NH,  x = 2.5 km

3. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 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. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001 0 UTC, 23 Sep 01 0 UTC, 24 Sep 01 Geopotential height [gpm] at 500 hPa IWV [kg m -2 ] sea level pressure wind at 850 hPa Cabauw.

5. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001 Cabauw Radiosoundings, μ- & IR radiometer, lidar super site MODIS 10:40 UTC

6. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: aircraft CASI observations by FU Berlin, Radiances at 753 nm 10 km 1.4 km

7. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: LWC Satellite retrieval from KNMI

8. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001 Cloud radar - refectivity - velocity - LDR LWP Lidar Radiosonde

9. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: cloud radar Markus Quante, GKSS

10. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 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. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: LWC 7:58 to 9:57 UTC mean LWC adiabatic 90 % percentile aircraft meas. in the vicinity of the measurement site (< 5 km) LWP IPT = 64 g m -2 LWP adiab = 100 g m -2

12. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: aircraft Aircraft observations by Merlin, Partenavia, Cessna GKSS particle volume monitor liquid water content (LWC) of drops with diameter<40 μ m; PVM-100A 3, 14, p, m, b LWC, effective radius (r eff ) Nevzorov Probe 5, liquid and total (liquid plus ice) water content (TWC) LWC, TWC FSSPsizing of single droplets with diameter < 40 μ m; FSSP-100 5, m FSSP-100-ER 5, m Fast-FSSP 3, 14, p, m droplet size distribution (DSD) optical array probes droplets with diameter between 25 and 800 μ m with OAP-2D2- C 5, p, m OAP-2D2-P 5, m DSD aerosol sensors aerosol concentration for particles > 0.01 µm with CPC- 3010 14, p,m ; PCASP-X 14, p particle concentration and size distribution albedometer 14,p 1024 channels between 290 an 1000 nm; active horizontal stabilization spectral irradiances ↓↑ imagerradiances between 450 and 1000 nm by casi 19, c spectrally resolved images

13. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Model comparison Cloud cover at Cabauw RACMO with 24 layers and ECHAM4 Physics RACMO with 40 layers and ECMWF physics Ulrika Willen

14. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Model comparison Cloud cover at Cabauw Ulrika Willen

15. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Model comparison: Cabauw site LWC RACMO (ECHAM4) RACMO (ECMWF) LM RCA Méso-NH

16. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 LM and Precipitation Cabauw Precipitation [mm/h] Frequency of occurence [%] 0 0-0.1 0.1 -1 > 1 LWP, 23 September 12 UTC Black contours show edges of precipitation areas

17. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003 0 UTC, 23 Sep 01 0 UTC, 24 Sep 01 Geopotential height [gpm] at 500 hPa IWV [kg m -2 ] sea level pressure wind at 850 hPa Cabauw

18. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003

19. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003 Cabauw Marc Schröder LM, LWP 11 UTC 0.3, 0.6, 0.9 kg m -2 over land MODIS, 10:01 UTC

20. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 LM LWC domain average 11 UTC, Top 2700 m 5:15 8:30 11:20 14:17 wind speed wind direction temperature virt. pot. temp. spec. humidity rel. humidity (+ice sat)

21. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003

22. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003 ACTOS system Holger Siebert IfT Leipzig

23. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003

24. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 21 May 2003

25. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Model comparison Cloud cover at Cabauw

26. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Model comparison Cloud cover at Cabauw different vertical resolutions for RCA model Ulrika Willen

27. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 Conclusions  two well documented cases (stratiform – convective) from BALTEX BRIDGE 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 of slight precipitation

28. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 23 September 2001: Wind 400 200 0 10 5 0

29. WMO Cloud Modelling Workshop, Hamburg, 12. Juli 2004 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