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CAS – total LWC comparison

CAS – total LWC comparison. warm clouds. Assumptions. Instruments time synchronization info isn't available for this period. Some of the instruments were not synchronized during this early stage of the campaign.

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CAS – total LWC comparison

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  1. CAS – total LWC comparison warm clouds

  2. Assumptions • Instruments time synchronization info isn't available for this period. • Some of the instruments were not synchronized during this early stage of the campaign. • I assume the positive mixing ratio coincide with onset of LWC measurements in CAS.

  3. Limitations • Horizontal sampling line – low penetration efficiency for big droplets and drops • High concentrations and screening of big droplets by small droplets or particles cause lower LWC content. • Presented CAS LWC data for droplets >3m.

  4. Equations (+10C) Liquid water mixing ratio measured by CAS: r≡Density of dry air Liquid Water Mixing Ratio +10C: Assumption: changing chamber pressure at saturation, flux from the walls:

  5. Runs details

  6. Conditions 1243.04 P[mb],RH[%],T[K] seconds

  7. 1243.04 [Kg/Kg]

  8. 1243.06

  9. 1243.06

  10. 1243.08

  11. 1243.08

  12. 1245.01

  13. 1245.01

  14. 1245.03

  15. 1245.03

  16. 1247.01

  17. 1247.01

  18. 1247.05

  19. 1247.05

  20. 1247.07

  21. 1247.07

  22. 1248.13

  23. 1248.13

  24. 1249.03

  25. 1249.03

  26. 1249.09

  27. 1249.09

  28. conclusions • Possible reasons for discrepancies in LWC measurements: -CAS limitation that were mentioned -wrong measurement of Pressure change -wrong measurement of MBW_dew -wall losses • Should be compared to WELAS LWC

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