Abstract
The effect of cloud condensation nuclei (CCN) on the production of large cloud droplets in a shallow cumulus cloud was studied by numerical modeling. Dynamical processes were treated in an Eulerian framework in an axially symmetric model. Microphysical processes in the layer near cloud base were treated in a Lagrangian framework using air-parcels which ascend successively, in order to avoid the influence of artificial broadening of droplet size distribution on the formation of large cloud droplets. Following conclusions were reached. When the concentration of nuclei in the range of Aitken size (radius_??_0.lμm) is low, large droplets are produced mainly by coalescence which occurs between droplets formed on nuclei smaller than 1μm in radius (large nuclei). In this case droplets formed on giant nuclei (radius>1μm) do not contribute to the concentration of large cloud droplets. When the concentration of nuclei in the range of Aitken size is high, droplets formed on giant nuclei contribute largely to the concentration of large droplets and most of large droplets are produced by coalescence between droplets formed on giant nuclei.
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Schedule a callMore From: Journal of the Meteorological Society of Japan. Ser. II
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