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ICE - Laboratory experiment goals

ICE - Laboratory experiment goals. Basic scientific understanding Check performance of airborne instruments Develop new measurement techniques & combining methods (CVI -> CFDC) STRENGTHS: Environment control Repeatability Mechanistic studies Test specific aerosol types (dust, bacteria, ..)

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ICE - Laboratory experiment goals

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  1. ICE - Laboratory experiment goals • Basic scientific understanding • Check performance of airborne instruments • Develop new measurement techniques & combining methods (CVI -> CFDC) STRENGTHS: Environment control Repeatability Mechanistic studies Test specific aerosol types (dust, bacteria, ..) Crystal growth habits & rates Effects of organic coatings, electric charge, ..

  2. Laboratory Experiments A. Cloud types Layer • upslope • stratus Wave Cumulus • warm base • cold base

  3. Laboratory Experiments B. Discussion Topics-AIDA desert dustPaulF summarized yesterday Sulfuric acid coated soot aerosolsnew JGR paper, in press

  4. AIDA (Aerosol Interactions and Dynamics in the Atmosphere) 84 m3

  5. w. sat Koop AIDA - Sulfuric acid coated soot aerosolsice nucleating threshold Koop, T., B. P. Luo, A. Tsias, and T. Peter (2000), Water activity as the determinant for homogeneous ice nucleation in aqueous solutions, Nature, 406 (6796), 611–614.

  6. Lab (& modeling) studies

  7. Measurement challenges • Ice nucleation modes: • deposition ………………………….X • condensation-freezing…………..X • contact-freezing…………………X • evaporation-freezing ……………? • electro-freezing…………………? • Discriminating liquid from ice at small sizes (~1 µm) • Development of new techniques to measure ice nuclei • Aerosol concentrator (to improve statistics)

  8. Lab studies – possible participants NCAR • EOL, ACD NOAA • Aeronomy Lab, .. International collaborations: • Germany, Japan, UK, Switzerland U.S. universities • CSU • DRI • Michigan Tech. • South Dakota SMT • PennState • Washington • Colorado • Wyoming

  9. Fluid dynamics modeling of instruments

  10. Computational mesh at inlet

  11. Compare FLUENT vs approx.thermodynamic trajectories

  12. Compare FLUENT vs approx.velocity profile

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