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Dr. Dagmar Nagel GKSS Research Center Geesthacht Institute for Coastal Research

Structure of microphysical cloud parameters in Cu and StCu clouds during the BBC/4D-Clouds field campaign at Cabauw in September 2001. Dr. Dagmar Nagel GKSS Research Center Geesthacht Institute for Coastal Research Max-Planck-Strasse 1 D 21502 Geesthacht Germany Email: dagmar.nagel@gkss.de.

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Dr. Dagmar Nagel GKSS Research Center Geesthacht Institute for Coastal Research

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  1. Structure of microphysical cloud parameters in Cu and StCu clouds during the BBC/4D-Clouds field campaign at Cabauw in September 2001 Dr. Dagmar Nagel GKSS Research Center Geesthacht Institute for Coastal Research Max-Planck-Strasse 1 D 21502 Geesthacht Germany Email: dagmar.nagel@gkss.de BBC/4DC meeting Leipzig 13.-16.05.02

  2. 1. Instrumentation 1.1 Aircraft 1.2 Probes 2. Calibration 2.1 Absolute sizing 2.2 Highspeed calibration 4. Results 4.1 Products 4.2 Examples from the field campaign 5. Outlook

  3. 1. Instrumentation Merlin IV of Meteo France with PMS probes BBC/4DC meeting Leipzig 13.-16.05.02

  4. PMS FSSP-ER / PMS FSSP-100 PMS OAP 2D2-C PMS OAP 2D2-P Size range between 2 µm to 6.4 mm Nevzorov probe 1. Instrumentation

  5. 2. Calibration Absolute calibration with monodisperse droplet generator

  6. Definition Measurement particle flow Y filter d DOF Z sample volume : X concentration : Signal (red) and annulus (blue) produced by a glass fiber 2. Calibration Highspeed calibration at 100 m/s – determination of the sample volume

  7. 2. Calibration Highspeed calibration at 100 m/s – determination of the sample volumn DOF as function of different materials at low speeds (2 m/s) for FSSP-ER, range 0

  8. 2. Calibration Highspeed calibration at 100 m/s – determination of the sample volume DOF als Funktion der Geschwindigkeit

  9. 2. Calibration Highspeed calibration at 100 m/s – channel shift Channel shift measured with FSSP-100 at speeds between 15 m/s and 100 m/s

  10. Time series of every flight section for every probe for Spectra of every probe for every flight section 10s time series of bulk data like 10s merged spectra of all three probes 3. Calculation procedure Products: number concentration effective radius water content Combination of single spectra from all three probes for 10s periods effective radius number concentration liquid and ice water content

  11. 50 % limit 25 % limit 50 % limit 13.09.01 Merlin flight 41, leg 8 23.09.01 Merlin flight 45, leg 3 3. Calculation procedure Combination of single spectra from all three probes for 10s periods

  12. 4. Results Data overview No. Date Merlin flight between hor. legs between soundings between Not useable due to missing data! 4 5 6 7 8

  13. 4. Results 13.09.01 13.09.01 09:32:00 leg 1, 907 m

  14. 4. Results 13.09.01 Typical size and volume distribution at leg 1, 907 m

  15. 4. Results 13.09.01 Effective radius and total water content between S1 and B5

  16. 4. Results 13.09.01 Liquid and ice water content between S1 and B5

  17. 4. Results 20.09.01 20.09.01 12:21:06 leg 5, 2036 m

  18. 4. Results 20.09.01 Effective radius and total water content between S1 and S3, part 2

  19. 4. Results 20.09.01 Liquid and ice water content between S1 and S3, part 2

  20. 4. Results 20.09.01 Decent (black) at the beginning and decent (red) and ascent (green) at the end of the flight between S1 and S3

  21. 4. Results 23.09.01 23.09.01 13:28:40 leg 3, 892 m

  22. 4. Results 23.09.01 Liquid water content and number concentration between S1 and S3

  23. 4. Results 23.09.01 Effective radius and liquid water content between S1 and S3

  24. 4. Results 25.09.01 25.09.01 14:21:10 leg 1, 644 m

  25. 4. Results 25.09.01 Effective radius and liquid water content between S1 and S2

  26. 4. Results 25.09.01 25.09.01 15:10:50 ascent next to Cabauw

  27. 4. Results 25.09.01 Ascent at Cabauw (black) and horizontal legs (colored) between S1 and S2

  28. 4. Results 27.09.01 27.09.01 10:44:32 leg 4, 915 m

  29. 4. Results 27.09.01 Effective radius and water content at leg 3 (open symbols) and leg 4 (solid symbols) between S1 and S5

  30. 4. Results 27.09.01 Typical size and volumn distribution between 917 m and 1522 m height next to Cabauw

  31. 4. Results 27.09.01 Typical size and volumn distribution between 935 m and 1307 m height in a Cumulus cloud at leg 4

  32. Improvement of the algorithm for the combination of single spectra Comparison with data from Nevzorov probe and PVM Detailed comparison to measurements of ground-based radar 5. Outlook

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