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Linear eddy modeling of droplet spectral evolution
during entrainment and mixing in cumulus clouds
C-W Su, S. K. Krueger, P. A. McMurtry and P. H. Austin
Atmospheric Research, 1998, 47-48, 51-58.
Abstract
The explicit mixing parcel model (EMPM) of Krueger et al. (1996) is
extended to explicitly account for individual droplet growth. The
model provides a 1D representation of physical properties within a
cloud parcel and incorporates the rising of the cloud parcel,
entrainment of
environmental air into the parcel, finite rate turbulent mixing
parameterized by Kolmogorov inertial range scalings, and droplet
growth. Because the simulation is performed in a 1D domain, all
relevant length scales of the mixing process can be resolved. For the
typical domain size used (20 m) in this study the growth of
approximately 2000
droplets is explicitly calculated based on their local environments.
Comparisons of computed droplet spectra with spectra obtained from
airplane penetration exhibit good agreement. Further results showing
effects of entrained CCN, droplet sedimentation and mixing rates on
droplet spectral evolution are provided.
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