Investigation of the action of hygroscopic particles on a warm convective cloud from the results of numerical simulation |
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| Authors: | A S Drofa |
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| Institution: | 1.RPA Typhoon,Obninsk, Kaluga oblast,Russia |
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| Abstract: | The results of a numerical simulation of the action of hygroscopic particles on a warm convective cloud with the purpose of
obtaining additional precipitation are presented. The one-dimensional numerical model considered in this work describes the
evolution of the cloud medium in the central part of an axisymmetric convective cloud at the specified height-variable velocity
of the upward air flow which forms the cloud. Our model comprehensively describes microphysical processes in the cloud medium
with the use of the kinetic equation for the size distribution of cloud droplets. This model makes it possible to obtain the
spatiotemporal pattern of the cloud formation and development and to analyze regular features in the cloud evolution under
the action of hygroscopic reagents. The cloud characteristics calculated with the use of this model correspond to the cloud
parameters observed in natural conditions of the atmosphere. The process of precipitation stimulation by hygroscopic particles
in convective clouds with vertical thicknesses of 2.5–4.5 km was analyzed on the basis of the results of numerical calculations.
The results of calculations of the dependence of the intensity and total amount of precipitation on the vertical cloud thickness
and parameters of particles introduced into the cloud are presented. It is shown that hygroscopic particles with root-mean-cube
radii of 1–1.5 μm are the most effective for acting on warm convective clouds with the purpose of obtaining additional precipitation.
In this case, the required reagent expenditure is 100–200 kg/km2. The conditions necessary for obtaining the maximal positive effect of the action are elucidated. |
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