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、惯性力、泳动力或电力的反应不同。 廷斯利博士从理论上证明，电清除，即带电云滴通过静电诱导捕获带电气溶胶粒子，即使在弱带电云中也很重要。 在这项资助下，他将把收集效率的计算扩展到半径从0.001到10微米的气溶胶粒子，范围很广，包括温度、压力、湿度、粒子电荷、粒子密度和液滴大小。 电气，惯性和电泳效应将分别处理和组合。 导电带电球体之间的电力的精确公式将与先前使用的镜像电荷理论进行比较。 这些结果将用于估计云清除浮质粒子的速度，这是大气化学的一个重要考虑因素，也可能是通过液滴与成冰核碰撞形成降水的一个重要考虑因素。 将努力对结果进行参数化，以用于数值云模式。

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.