Dependence of the simulated seeding effects of Cb cloud on the types of the AgI agents

Abstract

A one-dimensional kinematic model is used to investigate the effects of silver iodide seeding in the region of a Cb cloud between isotherms of -8°C and -12°C. The agent interaction with cloud atmosphere is simulated by an improved microphysical model version which includes phoretic processes. The behaviour of the different agent types is investigated using the maximum values of agent mixing ratios and corresponding agent particle masses and radii. It is shown that the agent residence time in the seeding zone significantly depends on vertical velocity. The residence time is comparable to that previously reported. On the other side, the final graupel production decreases slightly when vertical velocity increases, while the corresponding graupel production is quite different for agents used. The main agent nucleation mechanisms are the Brownian coagulation of cloud droplets, inertial impact of cloud droplets and deposition nucleation. © 1993 Springer-Verlag.