Turbulence Collision Enhancement in Convective Clouds
Primary Author: Onishi, Ryo Additional Authors: Keiko Takahashi, Earth Simulator Center, JAMSTEC, Japan
Satoru Komori, Kyoto University, Japan
Turbulence Collision Enhancement in Convective Clouds
Ryo Onishi
Earth Simulater Center (ESC)
Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
E-mail:onishi.ryo@jamstec.go.jp
Keiko Takahashi, Earth Simulator Center, JAMSTEC, Japan
Satoru Komori, Kyoto University, Japan
There is a growing consensus that the collision growth rate of cloud droplets can be increased by turbulence. We have performed numerical simulations of convective clouds to investigate the turbulence effects on cloud droplet collisions. We used the collision kernel model which we had developed to predict the collision frequency in cloud turbulence. Preliminary results of our simulations have shown that the particle collision growth is dramatically promoted by turbulence in orographic convective clouds. They have also shown that the total amount of rainfall over a mountain is significantly increased. These results indicate that we have to take the turbulence enhancement into account in mesoscale weather simulations.
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