The Simulation of a Convective Cloud in a 3-D Model With Explicit Microphysics. Part I: Model Description and Sensitivity Experiments
Open Access
- 1 May 1991
- journal article
- Published by American Meteorological Society in Journal of the Atmospheric Sciences
- Vol. 48 (9) , 1160-1189
- https://doi.org/10.1175/1520-0469(1991)048<1160:tsoacc>2.0.co;2
Abstract
A three-dimensional nonhydrostatic anelastic numerical model of a convective cloud with an explicit description of microphysical processes has been developed. Two distribution functions are considered in the model—one for cloud condensation nuclei (19 categories from 0.0076 to 7.6 microns) and another for cloud droplets and raindrops (30 categories on a logarithmic scale from 4 to 3250 microns). The prognostic kinetic equations for these distribution functions enable the calculation of the aerosol and drop spectra starting from activation and culminating in rain formation. The warm rain microphysical processes studied include nucleation, condensation/evaporation, coalescence, breakup and sedimentation. Analysis of supersaturation evolution with time shows that it does not experience growth with the onset of coalescence and correlates well with values derived from quasi-steady assumptions. Sensitivity tests of the accuracy of the supersaturation calculations and the effect of the salt factor in th... Abstract A three-dimensional nonhydrostatic anelastic numerical model of a convective cloud with an explicit description of microphysical processes has been developed. Two distribution functions are considered in the model—one for cloud condensation nuclei (19 categories from 0.0076 to 7.6 microns) and another for cloud droplets and raindrops (30 categories on a logarithmic scale from 4 to 3250 microns). The prognostic kinetic equations for these distribution functions enable the calculation of the aerosol and drop spectra starting from activation and culminating in rain formation. The warm rain microphysical processes studied include nucleation, condensation/evaporation, coalescence, breakup and sedimentation. Analysis of supersaturation evolution with time shows that it does not experience growth with the onset of coalescence and correlates well with values derived from quasi-steady assumptions. Sensitivity tests of the accuracy of the supersaturation calculations and the effect of the salt factor in th...Keywords
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