Electroscavenging in Clouds

云中的电清除

• 批准号: 0308523
• 负责人: Brian Tinsley
• 金额: $ 6.51万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-04-01 至 2005-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0308523&HistoricalAwards=false
• 关键词: Electroscavenging; Clouds

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.

云滴可能会碰撞并捕获气溶胶粒子，因为它们对重力、惯性、磷光或电动力的反应不同。廷斯利博士从理论上证明，即使在带电的云层中，静电清除也可能很重要。静电清除指的是带电的云滴通过静电捕获带电的气溶胶粒子。在这笔赠款上，他将把他对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，范围广泛，包括温度、压力、湿度、颗粒电荷、颗粒密度和液滴大小。电效应、惯性效应和磷光效应将分开或合并处理。导电带电球体之间的电场力的精确公式将与先前使用的镜像电荷理论进行比较。结果将用于估计云对气溶胶粒子的清除速度，这是大气化学的一个重要考虑因素，并可能用于通过液滴与结冰核碰撞而形成降水。将努力将结果参数化，以用于数值云模式。