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AIRBORNE CLOUD MICROPHYSICAL MEASUREMENTS DURING THE BBC CAMPAIGN

AIRBORNE CLOUD MICROPHYSICAL MEASUREMENTS DURING THE BBC CAMPAIGN. Sebastian Schmidt, Manfred Wendisch, Evelyn Jäkel 13/5/2002. Aircraft PARTENAVIA. Overview. (1) Cloud microphysical instruments (2) Data Analysis calibration time resolution (3) Overview of flight patterns and data

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AIRBORNE CLOUD MICROPHYSICAL MEASUREMENTS DURING THE BBC CAMPAIGN

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  1. AIRBORNE CLOUD MICROPHYSICAL MEASUREMENTS DURING THE BBC CAMPAIGN Sebastian Schmidt, Manfred Wendisch, Evelyn Jäkel 13/5/2002

  2. Aircraft PARTENAVIA

  3. Overview • (1) Cloud microphysical instruments • (2) Data Analysis • calibration • time resolution • (3) Overview of flight patterns and data • (4) Outlook

  4. CLOUDS (ambient conditions) Particle Volume Monitor (2-50 µm) Fast Forward Scattering Spectrometer Probe (1-40 µm) Optical Array Probe (2DC) (25-400 µm) AEROSOL (through inlet) Passive Cavity Aerosol Spectrometer Probe (0.1-10 µm) Condensation Particle Counter (0.01-2 µm) (1) Cloud microphysical instruments Fast FSSP PVM

  5. Fast FSSP Cloud droplets pass a laser beam  forward scattering signal  store set of amplitudes (size), durations and interarrival times of droplets (no electronic dead-times) PVM LWC of droplet population directly measured (laser beam  forward scattering signal  optical filter  analogue signal)

  6. (3) Data Analysis (a) calibration response of FSSP for three days

  7. calibration curves of Fast FSSP 4DC

  8. Power spectra (concentration: FSSP, LWC: FSSP, PVM)  f -5/3 Ok for PVM (200 Hz) FSSP: over 1-5 Hz nonlinear filtering required (b) time resolution

  9. (3) Overview of flight patterns and data

  10. 5/9/2001 morning

  11. 5/9 a 6 V 5/9 b 8 V (very thin layers) 6/9 1 H, 1 V , 1 V  (layers < 500 m) 11/9 some horizontal „dips“ 13/9 1 VH  (ca. 500 m); several H (long!); 1 HV  (ca. 500 m) 14/9 1 V, 1 H (very short) 18/9 1 V near Rotterdam airport; no other clouds 23/9 a several very short V 23/9 b 6 H, 1 HV  27/9 2 V , 2 H, 1 HV Overview (all days) V=vertical profile H=horizontal legs VH/HV=vertical profiles with horizontal parts  = down  = up

  12. (4) Outlook • discuss data and pick out cases which are worth studying in more detail and worth comparing with Radar etc. • try to extract “2D”-cloud structure from airborne measurements • apply filtering to improve time resolution of Fast FSSP (which frequency required?)

  13. Happy End ?

  14. Fast FSSP

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