BBC/4DC meeting Leipzig 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 Geesthacht Germany BBC/4DC meeting Leipzig

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

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

BBC/4DC meeting Leipzig Instrumentation PMS FSSP-ER / PMS FSSP-100 PMS OAP 2D2-CPMS OAP 2D2-P Nevzorov probe Size range between 2 µm to 6.4 mm

BBC/4DC meeting Leipzig Calibration Absolute calibration with monodisperse droplet generator

BBC/4DC meeting Leipzig Calibration Highspeed calibration at 100 m/s – determination of the sample volume Measurement X Z Y filter DOF Definition particle flow sample volume : concentration : d Signal (red) and annulus (blue) produced by a glass fiber

BBC/4DC meeting Leipzig 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

BBC/4DC meeting Leipzig Calibration Highspeed calibration at 100 m/s – determination of the sample volume DOF als Funktion der Geschwindigkeit

BBC/4DC meeting Leipzig 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

BBC/4DC meeting Leipzig Calculation procedure Combination of single spectra from all three probes for 10s periods Products: number concentration effective radius water content effective radius number concentration liquid and ice water content 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

BBC/4DC meeting Leipzig Calculation procedure Combination of single spectra from all three probes for 10s periods Merlin flight 45, leg Merlin flight 41, leg 8 25 % limit 50 % limit

BBC/4DC meeting Leipzig S1 – S2 – S partly m6590 – 2400 m S1 – B58900 – 2400 m S1 – S – 2050 m 1820 – 2340 m – 2670 m S1 – S S1 – S37570 – 1210 m9580 – 1200 m S1 – S36740 – 1360 m S1 – S24590 – 920 m1600 – 3160 m S1 – S partly 590 – 1840 m6580 – 2720 m S1 – S partly 610 – 1550 m12620 – 1540 m 4. Results Data overview DateNo.Merlin flightbetweenhor. legssoundingsbetween Not useable due to missing data!

BBC/4DC meeting Leipzig Results :32:00 leg 1, 907 m

BBC/4DC meeting Leipzig Results Typical size and volume distribution at leg 1, 907 m

BBC/4DC meeting Leipzig Results Effective radius and total water content between S1 and B5

BBC/4DC meeting Leipzig Results Liquid and ice water content between S1 and B5

BBC/4DC meeting Leipzig Results :21:06 leg 5, 2036 m

BBC/4DC meeting Leipzig Results Effective radius and total water content between S1 and S3, part 2

BBC/4DC meeting Leipzig Results Liquid and ice water content between S1 and S3, part 2

BBC/4DC meeting Leipzig Results Decent (black) at the beginning and decent (red) and ascent (green) at the end of the flight between S1 and S3

BBC/4DC meeting Leipzig Results :28:40 leg 3, 892 m

BBC/4DC meeting Leipzig Results Liquid water content and number concentration between S1 and S3

BBC/4DC meeting Leipzig Results Effective radius and liquid water content between S1 and S3

BBC/4DC meeting Leipzig Results :21:10 leg 1, 644 m

BBC/4DC meeting Leipzig Results Effective radius and liquid water content between S1 and S2

BBC/4DC meeting Leipzig Results :10:50 ascent next to Cabauw

BBC/4DC meeting Leipzig Results Ascent at Cabauw (black) and horizontal legs (colored) between S1 and S2

BBC/4DC meeting Leipzig Results :44:32 leg 4, 915 m

BBC/4DC meeting Leipzig Results Effective radius and water content at leg 3 (open symbols) and leg 4 (solid symbols) between S1 and S5

BBC/4DC meeting Leipzig Results Typical size and volumn distribution between 917 m and 1522 m height next to Cabauw

BBC/4DC meeting Leipzig Results Typical size and volumn distribution between 935 m and 1307 m height in a Cumulus cloud at leg 4

BBC/4DC meeting Leipzig Outlook 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