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颗粒，因为它们对重力，惯性，整形或电力的反应不同。 Tinsley博士从理论上表明，电载液（指通过带电的云液滴捕获带电的气溶胶颗粒的捕获）也可能很重要，即使在弱电动云中也很重要。 在这笔赠款上，他将将收集效率的计算扩展到气溶胶颗粒，半径范围从0.001到10微米，在温度，压力，湿度，颗粒电荷，颗粒密度和滴大小的广泛组合上。 电，惯性和流动效应将分别处理和组合处理。 将导电球之间的电力的确切表述与前面使用的图像电荷理论进行比较。 结果将用于估计云层清除气溶胶颗粒的速率，这是大气化学的重要考虑因素，可能是通过液滴与制冰核的碰撞来形成降水的速度。 将努力将结果参数化，以便在数值云模型中使用。