大気汚染粒子 (NH4) 2SO4を凝結核とする雲粒の生成過程

抄録

In order to construct the model which describes quantitatively the acidification process of rain water by rainout of atmospheric pollutants, the generation and growth of cloud droplets on cloud condensation nuclei are simulated numerically with use of a mathematical model. The mathematical model is constituted by the conservation laws of water mass and heat energy and the state equation of ideal gas. As the speed of time variation of droplet heat Q_w is very fast compared with that of droplet mass m_w, droplet temperature T_a can be treated as in steady state. The equilibrium droplet size a_e is dependent on the 3/2 power of the initial radius a_s0 of cloud condensation nucleus (NH4) 2SO4. The larger a_s0 is, the more the droplet grows in its equilibrium size a_e. Then, it takes much time for large condensation nucleus to attain the equilibrium size a_e.