A Simulation Approach to the Formation of Precipitation Particles Using the Monte Carlo Method

[摘要] The turbulent effect upon the mechanism of large cloud droplet formation in a warm cloud is discussed.Firstly, the basic data in field works, simultaneous observations of cloud physical elements in a stratiform cloud at a mountainside and observations of the spatial concentration fluctuation of cloud droplets were analysed as regards simulation study and thereby it was suggested that the turbulence arising from the instability of atmospheric layer would exert the influence to the large droplet formation.Secondly, basing upon the above data, the Monte Carlo method was applied to the simulation study for the cases in which cloud droplets distributed spatially at random and in which they distributed spatially in heterogeneous concentration as caused by turbulence, in aiming to obtain the information about the difference in growth of large droplets between the two cases.In the latter case, it was noticed that a few large droplets grew more rapidly than in the former case.

[学科分类] 大气科学