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JD227 (Aug. 15) Summary

JD227 (Aug. 15) Summary. Wednesday’s discussions, 15 August 2001, DOY 227

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JD227 (Aug. 15) Summary

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  1. JD227 (Aug. 15) Summary

  2. Wednesday’s discussions, 15 August 2001, DOY 227 Conditions:Overcast with until ca 227.3 with precipitating cloud to about 300m (lowest cloud level 20-30m). The cloud then decreased in height, broke up and gradually a fog formed starting at about 07:50 (JD227.326). Freezing of leads started 09:35h and continued for certain to 11.42h maybe longer. The fog cleared gradually between 13:30h (JD227.562) to 15:00h (JD227.625). Flight #29 (JD 227.51), Nucleation apparently occurred in the layer where the cloud had been and a layer of particles >300nm was immediately above it. The descent showed the nucleation mode particles at a lower level than on the ascent. MT please fill in the met story in between flight #29 and flight #31. At 22h20m there was cloud on top of the inversion and specific humidity increased with height. The >300nm particle maxima lay below the inversion. Slow ascent (Flight #31) aiming for a hole in the lowest cloud deck at 100 m. Above lowest cloud deck at 23:22:08 (JD 227.974). At 23h00 the surface layer was well-mixed, so why were the >300nm particles so highly stratified?

  3. Time-height cosssections of temperature from the Scanning radiom. Black dots: cloud base Blue curve: cloud fraction (%) Red curve: visibility (km) Black arrow: Time of flight #23 Blue curve: Wind speed (ms-1) Red curve: Windirection (°) Blue curve: Temperatur (°C) Red curve: Relative Humidity (%)

  4. Black dots: cloud base Blue curve: cloud fraction (%) Red curve: visibility (km) Black arrow: Time of flight #29-32

  5. DMPS/UCPC Plots

  6. JD227.423 [Platinum]

  7. JD227.445 [Platinum] {< Heli 29}

  8. JD227.542 [Platinum] {> Heli 29}

  9. JD227.552 [Platinum]

  10. JD227.560 [Platinum]

  11. JD227.595 [Platinum]

  12. JD227.675 [Platinum]

  13. JD227.693 [Platinum]

  14. JD227.718 [Platinum]

  15. JD227.740 [Platinum]

  16. ** Low Height Range Plots (500m) **

  17. JD227.423 [Platinum]

  18. JD227.445 [Platinum] {< Heli 29}

  19. JD227.542 [Platinum] {> Heli 29}

  20. JD227.552 [Platinum]

  21. JD227.560 [Platinum]

  22. JD227.637 [Platinum]

  23. JD227.675 [Platinum]

  24. JD227.693 [Platinum]

  25. JD227.718 [Platinum]

  26. JD227.740 [Platinum]

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