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Albrecht effect aka the second aerosol indirect effect PDF

18 Pages·2015·2.67 MB·English
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Albrecht effect  a.k.a. the second aerosol indirect effect Differences in  precipitation  “efficiency” between  continental and marine  clouds Battan, L. J., and R. R. Braham, 1956: A Study of Convective Precipitation Based on Cloud and Radar Observations. J. Meteorol.,13, 587–91 Squires, P., 1958: The Microstructure and Colloidal Stability of Warm Clouds. Tellus, 10, 262–71. Hudson, J. G., 1983: Effects of CCN Concentrations on Stratus Clouds. J. Atmos. Sci., 40, 480–86. Hocking size  limit Later calculations  for collision  efficiency of small  drops • Sharp drop‐off in collision  efficiency when small drop  radius r < 8 m (the  Hocking limit) A Short Course in Cloud Physics, Third Edition (International Series in Natural Philosophy), M K Yau, R R Rogers Albrecht “effect” • Mentions effect of drizzle on stabilizing PBL • Model: Albrecht trade‐Cu model, modified to include precip. Models cloud  fractional cover using an RH‐based parameterization. Key processes controlling PBL clouds Radiative (left) and latent (right) heating rates Informed by  aircraft  observations From Brost, R. A., J. C. Wyngaard, and D. H. Lenschow, 1982: Marine Stratocumulus Layers. Part II: Turbulence Budgets. J. Atmos. Sci., 39, 818–36. Also…Nicholls, S., and J. Leighton., 1986: An Observational Study of the Structure of Stratiform Cloud Sheets: Part I. Structure. Quart. J. Roy. Meteorol. Soc., 112, 431–60.

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Albrecht “effect”. • Mentions effect of drizzle on stabilizing PBL. • Model: Albrecht trade-Cu model, modified to include precip. Models cloud fractional
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