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，湿沉降是去除大气中微量气体成分和气溶胶颗粒的主要机制。虽然云层本身的温度经常低于冰点，但世界上大部分的降水都以雨的形式落到地面。冰晶在云的发展中起着重要的作用；然而，它们在食腐中的作用并不为人所知。在这个研究项目中，Lamb教授将对气体在冰晶表面的吸附、气体在灰冰中的夹持以及铵对二次冰裂产生的抑制进行实验室实验。这些结果将使我们更好地理解云中冰晶与化学物质之间的相互作用，从而改进云模式中清除的建模。

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.