8/28/2002 Part 3 1
Cloud Microphysics
Parameterization in
Mesoscale and Cloud-
scale NWP models
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New Approach to Cloud Microphysics Parameterization in NWP Models, Study notes of School management&administration
A new bulk microphysics approach for cloud parameterization in mesoscale and cloudscale nwp models. The approach heavily uses lookup tables and extends the scheme to self-collection of cloud droplets. The document also covers analytical solutions to the collection equation, errors in collection, and the application of the stochastic model to rams.
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Cloud Microphysics
Parameterization in
Mesoscale and Cloud-
scale NWP models
Outline
• Review of “classic” Kessler
parameterization scheme.
• Analytical solutions to the collection
equation.
• A new bulk microphysics approach
heavily using lookup tables.
• Extension of scheme to self-
collection of cloud droplets.
• Plans for the near future.
• The ice-phase.
• Implementation in large-scale
models.
The Kessler
Formulation of
Accretion
Parameterization of Cloud
Microphysics
cr c
cr r
g ( nR ) δ nR A A
10 mm 100 mm 1000 mm
- To model initial broadening of distribution to drizzle by vapor deposition and collection, hypothesize an autoconversion process.