Electroscavenging in Clouds

云滴可能会碰撞并捕获气溶胶粒子，因为它们对重力、惯性、电泳或电作用力的反应不同。廷斯利博士已经从理论上证明，即使在弱电云中，电扫也很重要。电扫指的是带电的云滴在静电诱导下捕获带电的气溶胶粒子。在这笔资助下，他将把收集效率的计算扩展到半径从0.001到10微米的气溶胶颗粒，在温度、压力、湿度、粒子电荷、粒子密度和水滴大小的广泛组合范围内。电效应、惯性效应和电泳效应将分别或结合处理。导电带电球之间的电磁力的精确公式将与先前使用的像电荷理论进行比较。这些结果将用于估计云清除气溶胶粒子的速率，这是大气化学的一个重要考虑因素，也可能是通过液滴与形成冰的核碰撞形成降水的重要考虑因素。将努力将结果参数化，以便用于数值云模式。

Cloud droplets may collide and capture aerosol particles because of their different responses to gravitational, inertial, phoretic, or electrical forces. Dr. Tinsley has shown theoretically that electroscavenging, which refers to the electrostatically-induced capture of charged aerosol particles by charged cloud droplets, can be important even in weakly electrified clouds. On this grant he will extend his calculations of collection efficiency to aerosol particles with radii ranging from 0.001 to 10 micrometers over a wide range of combinations of temperature, pressure, humidity, particle charge, particle density, and drop size. Electrical, inertial, and phoretic effects will be treated separately and in combination. An exact formulation of the electrical forces between conducting charged spheres will be compared with the image charge theory used earlier. The results will be used for estimating the rate of scavenging of aerosol particles by clouds, an important consideration for atmospheric chemistry and possibly for the formation of precipitation through the collision of droplets with ice-forming nuclei. An effort will be made to parameterize the results for use in numerical cloud models.