Activation and Growth of Newly Formed Atmospheric Particles

新形成的大气颗粒的活化和生长

• 批准号: 1602086
• 负责人: Richard Flagan
• 金额: $ 63.46万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-05-01 至 2022-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1602086&HistoricalAwards=false
• 关键词: Activation; Growth; Newly; Formed; Atmospheric

This project is focused on the study of the formation and growth of new particles in the atmosphere. It involves an international collaboration that enables U.S. scientists to work at CERN, the European Organization for Nuclear Research in Switzerland, at the CLOUD (COsmics Leaving Outdoor Droplets) chamber there. The results of this research are expected to have implications that go beyond the atmospheric sciences, to numerous industrial and other natural processes.The objectives of this research are to: (1) advance measurement methods to make it possible to measure the size distribution of freshly nucleated clusters/particles as a function of time as they exist in the atmosphere in which they are formed in order to map their passage through the Kelvin regime, i.e., from near critical, or even sub-critical cluster sizes through to stable particles; (2) measure and model the multicomponent activation kinetics as low volatility organic compounds and extremely low volatility organic compounds condense on inert and sulfuric acid clusters in the Kelvin size regime, varying the temperature and composition of the atmosphere to probe the underlying mechanisms; (3) measure and model new particle formation, secondary activation, and growth in carefully controlled chamber experiments in order to constrain and parameterize new particle formation under a wide range of atmospheric conditions and for key aerosol precursors.

该项目的重点是研究大气中新颗粒的形成和生长。它涉及一次国际合作，使美国科学家能够在瑞士的欧洲核研究组织CERN（宇宙离开户外液滴）会议厅工作。预计这项研究的结果将具有超出大气科学，众多工业和其他自然过程的含义。这项研究的目标是：（1）提前测量方法，使得能够衡量新鲜新鲜分布的大小分布。成核簇/颗粒是时间的函数，因为它们存在于它们形成的大气中，以绘制其穿过开尔文制度的通过，即从接近临界，甚至是亚临界簇大小到稳定颗粒。 （2）测量和模拟多组分激活动力学作为低挥发性有机化合物和极低的挥发性有机化合物在开尔文尺寸状态下的惰性和硫酸簇上的凝结，从而改变了大气的温度和组成，以探测下层机制的探测； （3）测量和模拟新的颗粒形成，二次激活和经过精心控制的腔室实验中的生长，以在广泛的大气条件和关键的气溶胶前体下约束和参数化新的颗粒形成。