Numerical simulation on seeding effect of a new kind of liquid CO₂

The micro-physical amount change and cloud dynamical effect caused by seeding liquid CO_2 on July 11,2002 was simulated by three-dimensional cumulus mix cloud artificial rain enhancement numerical model in this paper.The result showed that the velocity of the maximum updraft increased after seeding from 0.37m/s(before seeding) to 0.54m/s(after seeding),and the appearing time of the maximum ascending velocity(W) in cloud after seeding advanced 4 minutes than that before seeding.It implied that seeding liquid CO_2 affected the dynamical process of cloud.Meanwhile compared with no seeding,the maximum value of rain water content in cloud increased from 1.04g/kg to 1.40g/kg.The appearing time of ice particle water content advanced 88 minutes,and that of the maximum value is 76 minutes ahead of time.The appearing time of the ice particle concentration advanced 72 minutes,and that of the maximum value is 72 minutes ahead of time.The appearing time of snow particle water content advanced 72 minutes,and that of the maximum value is 128 minutes ahead of time.The maximum value of rain water content in cloud decreased from 1.21g/kg to 0.87g/kg.All of these showed that seeding liquid CO_2 affected the micro-physical process of cloud,thus it caused the increase of rainfall on the ground.