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Study of Cloud Formation and Nucleation Dynamics in Flight Conditions on August 15, 2001

Explore the atmospheric conditions and cloud formation processes observed during flights on August 15, 2001. From overcast skies to fog formation, freezing of leads, and nucleation phenomena, this study delves into the intricate details of cloud dynamics.

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Study of Cloud Formation and Nucleation Dynamics in Flight Conditions on August 15, 2001

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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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