A Study of Microphysical Processes Associated with the Atmospheric Removal of Moisture and Trace Chemicals by Precipitating Clouds

在降水丰富的地区，湿沉降是从大气中去除微量气体成分和气溶胶颗粒的主要机制。尽管云本身的温度经常低于冰点，但世界上的大部分降水都是以雨的形式落在地面上的。冰晶在云的发展中扮演着重要的角色，然而，它们在清扫过程中的作用还不是很清楚。在这项研究项目下，兰姆教授将就气体在冰晶表面的吸附、雾化冰中气体的捕获以及铵抑制二次冰裂的产生进行实验室实验。这一结果将使我们更好地理解冰晶与云中化学物质之间的相互作用，从而改进云模式中的清扫模式。

In regions of copious precipitation, the wet deposition is the primary mechanism in removing trace gas constituents and aerosol particles from the atmosphere. Most of the world's precipitation falls to the ground as rain, although the clouds themselves frequently have temperatures below freezing. The ice crystals play an important role in the cloud development; however, their role in scavenging is not well known. Under this research project, Professor Lamb will conduct laboratory experiments on the adsorption of gas on the surface of ice crystals, the entrapment of gases in rime ice, and the inhibition of secondary ice splinter production by ammonium. The results should give us a better understanding of the interaction between ice crystals and chemical species in clouds, and thereby improve the modeling of scavenging in cloud models.