Laboratory, Field, and Theoretical Studies of the Water Uptake of Fresh and Aged Atmospheric Particles

在大气中，水通常需要有一个存在的表面，才能从蒸汽转变为液体。有机成分在控制云凝结核如何演化和云滴如何激活方面的确切作用目前尚不确定，但可能对天气和气候问题都有影响。作为前一个奖项(ATM-0336296)的延续，卡内基梅隆大学的研究人员将寻求进一步整合以实验室为基础的调查、化学传输建模和对典型气溶胶类型的吸湿行为的选定环境大气观测。主要的解释特征是颗粒组成、溶解度、吸湿生长和老化效应、二次有机气溶胶成分的挥发性以及环境颗粒作为云凝结核的能力。将使用一套气溶胶表征和成分测量任务来进一步进行这些调查。

In the atmosphere, water usually requires an exisiting surface to make the transition from vapor to a liquid phase. The exact role of organic components in controlling how cloud condensation nuclei evolve and how cloud droplet activation takes place presently remains uncertain, but potentially has implications for both weather and climate issues. In a continuation of a previous award (ATM-0336296), Carnegie Mellon investigators will seek further integration of laboratory based investigations, chemical transport modeling and selected ambient atmospheric observation of the hygroscopic behaviour of representative aerosols types. Key interpretive properties are particle composition, solubility, hygroscopic growth and ageing effects, volatility of secondary organic aerosol components and the ability of ambient particulates to act as cloud condensation nuclei. A suite of aerosol characterization and compositional measurements tasks will be used to further these investigations.