Laboratory Studies of Cloud Microphysical and Chemical Phenomena Involving Ice

大气痕量化学物质与云和地面相互作用 冰在复杂和不明确的方式。 与识别 未来对大气-地球系统建模的努力将 越来越多地依赖于关于这种相互作用的基本知识， 一系列的实验室实验将在此基础上进行。 研究项目。 的吸附和化学反应性 几种痕量气体（SO2、H2 O2、O3、HNO 3、HCl、CH 4和NO） 冰将用气相色谱锋面分析进行研究 在很宽的温度范围内（约-90 ° C至-20 ° C）。 的 动力学和热力学数据将阐明分子- 规模化机制的纳入和反应，并帮助 确定控制大气反应性的因素 与冰接触的痕量气体。 其他实验 将使用最近开发的连续流云 为了测量冰的生长能力， 过冷云获取颗粒物质并保留 挥发性气体 将使用简单的云模型来确保 实验室实验的结果与 大气云的微物理和化学现象。

Atmospheric trace chemicals interact with cloud and surface ice in complicated and ill-defined ways. With the recognition that future efforts to model the atmosphere-earth system will rely increasingly on basic knowledge about such interactions, a series of laboratory experiments is to be carried out under this research project. The sorption and chemical reactivity of several trace gases (SO2, H2O2, O3, HNO3, HCl, CH4, and NO) on ice will be investigated with gas chromatography frontal analysis over a broad range of temperatures (about -90oC to -20C). The kinetic and thermodynamic data will elucidate the molecular- scale mechanisms of incorporation and reaction and help to identify the factors controlling the reactivity of atmospheric trace gases that come in contact with ice. Other experimentation will be performed with a recently developed continuous-flow cloud chamber in order to measure the ability of ice growing in supercooled clouds to acquire particulate matter and retain volatile gases. Simple cloud models will be used to ensure that the findings of the laboratory experimentation are relevant to microphysical and chemical phenomena in atmospheric clouds.