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Acta Geophysica

, 59:1184 | Cite as

Macroscopic impacts of cloud and precipitation processes in shallow convection

  • Wojciech W. Grabowski
  • Joanna Slawinska
  • Hanna Pawlowska
  • Andrzej A. Wyszogrodzki
Article

Abstract

This paper presents application of the EULAG model combined with a sophisticated double-moment warm-rain microphysics scheme to the model intercomparison case based on RICO (Rain in Cumulus over Ocean) field observations. As the simulations progress, the cloud field gradually deepens and a relatively sharp temperature and moisture inversions develop in the lower troposphere. Two contrasting aerosol environments are considered, referred to as pristine and polluted, together with two contrasting subgridscale mixing scenarios, the homogeneous and the extremely inhomogeneous mixing. Pristine and polluted environments feature mean cloud droplet concentrations around 40 and 150 mg−1, respectively, and large differences in the rain characteristics. Various measures are used to contrast evolution of macroscopic cloud field characteristics, such as the mean cloud fraction, the mean cloud width, or the height of the center of mass of the cloud field, among others. Macroscopic characteristics appear similar regardless of the aerosol characteristics or the homogeneity of the subgrid-scale mixing.

Key words

shallow convection cloud microphysics CNN activation homogeneity of subgrid-scale mixing 

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Copyright information

© © Versita Warsaw and Springer-Verlag Wien 2011

Authors and Affiliations

  • Wojciech W. Grabowski
    • 1
  • Joanna Slawinska
    • 2
  • Hanna Pawlowska
    • 2
  • Andrzej A. Wyszogrodzki
    • 1
  1. 1.National Center for Atmospheric ResearchBoulderUSA
  2. 2.Institute of Geophysics, Faculty of PhysicsUniversity of WarsawWarsawPoland

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