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Cloud microphysics observed during VOCALS-REx

Cloud microphysics observed during VOCALS-REx. J. Wang 1 , P. H. Daum 1 Y.-N. Lee 1 , L. I. Kleinman 1 , A. Sedlacek 1 , G. I. Senum 1 , S. R. Springston 1 , J. Hubbe 2 1 Brookhaven National Laboratory, 2 Pacific Northwest National Laboratory ARM Aerosol Working Group Meeting

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Cloud microphysics observed during VOCALS-REx

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  1. Cloud microphysics observed during VOCALS-REx J. Wang1, P. H. Daum1 Y.-N. Lee1, L. I. Kleinman1, A. Sedlacek1, G. I. Senum1, S. R. Springston1, J. Hubbe2 1 Brookhaven National Laboratory, 2 Pacific Northwest National Laboratory ARM Aerosol Working Group Meeting October 2, 2009, Bounder, CO

  2. VOCALS Regional Experiment Oct.-Nov. 2008

  3. Scientific objectives VOCALS--Hypothesis 1a: Variability in the physicochemical properties of aerosols has a measurable impact upon the formation of drizzle in stratocumulus clouds. Aerosol-Cloud-Drizzle Interactions: Sampling strategy: Examine the gradients and variability in clouds and aerosols

  4. Dept. of Energy Gulfstream-1 flights 16 flights

  5. Relevant measurements

  6. Gradient in aerosol and cloud properties 10/28/08 Out bound In bound

  7. Gradient in aerosol and cloud properties 10/28/08

  8. Vertical profiles of cloud microphysics Higher drizzle LWC and precipitation flux at top

  9. Vertical profiles of cloud microphysics Average Nd LWP integrated from LWC Cloud top re R at base Na below cloud Higher drizzle LWC and precipitation flux at base

  10. Effects of aerosol on droplet conc. and size

  11. Autoconversion, accretion, and precipitation rate Cloud droplet Cloud droplet + Autoconversion Drizzle drop Cloud droplet Larger drizzle drop + Accretion Drizzle drop Khairoutdinov and Kogan (2000) Beheng (1994)

  12. Precipitation flux: parameterization vs. observation

  13. Relative role of autoconversion and accretion Drizzle mass production is dominated by accretion

  14. Effects of aerosol on precipitation flux Previous study (Comstock et al., 2004, EPIC):

  15. Summary • Strong gradients in aerosol and cloud properties observed during VOCALS-REx. • Observed impacts of aerosol on droplet concentrations and size were similar to previous in-situ studies. • Precipitation fluxes at cloud base calculated from two parameterizations agree with observations, and production of drizzle mass was dominated by accretion. • Aerosol has a measurable impact on precipitation flux at cloud base. The precipitation flux can be estimated using cloud bulk properties (LWP and Nd).

  16. Acknowledgements Scientists- Liz Alexander, John Jayne, Alex Laskin, Ryan Moffet, Mikhail Pekour, and others. Aircraft crew- Bob Hannigan, Dick Hone, and Bill Svancara Dept. of Energy- For funding the science and the aircraft.

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