Parallelization Of One And Half Cloud-Aerosol Bin Model And An Electrification Study Of CCOPE CASE

In order to add electrification and discharge processes into an one and half cloud-aerosol interaction bin model, we modified this series model as a parallel computation model, which can greatly improve the computation efficiency. Based on such an improvement for this model, one deep cumulus convection case of the CCOPE experiment at Montana on July 19th,1981 has been simulated and compared with the observations and previous studies.The simulation results show that our model with perturbation pressures considered is much better than the model with perturbation pressure omitted.Additionally, two non-inductive power parameterization schemes (TAK and SP98) have been added into this model which cannot only track aerosol mass of the dominant compound particles but also charge amounts within a water droplet or an ice particle when the collision electrification processes occurred. Furthermore, the spatial charge structures during this deep convection process have been simulated. The results show that both of these two schemes can spatially produce a dipole structure of charges and the charges mainly appeared in the upper part of the clouds with existence of graupel. Ice particles mainly carried positive charges and graupel particles carried negative charges, the vertical transportation plays an important role in the formation of the centers of positive and negative charges. Moreover, the electrification processes of the same kind of ice nuclei under different initial concentrations have been simulated. The results showed that the concentrations of charges are highly related to the concentrations of ice nuclei. The spatial distributions of the total charges formed under the conditions with different concentrations of ice nuclei are the same. Charge transfer occurs in the upper part of the main body of the clouds, with the vertical transportation of graupel particles the electrification region gradually shifted from the place with high temperatures and high effective cryogenic liquid water content to the place with low temperatures and the high liquid water content. The polarity of the charges transferred also changed from positive charges gradually into negative charges.