Development and application of an experimental technique for the simulaneous quantification of atmospheric ultrafine particle composition and turbulent transport

本建议旨在促进对大气气溶胶动力学关键过程的先进定量理解。开发和建立大气超细粒子形成（二次粒子形成）及其分布/再分布的直接原位测量急需的创新仪器。为此目的，将对最先进的粒子仪器（热解吸化学电离质谱）进行改进和扩展，以便应用于微气象技术（松弛涡流积累）。这一独特的发展将允许同时量化超细尺寸范围（直径小于10纳米）的大气纳米颗粒的化学成分和湍流传输。这种新型仪器的现场部署将揭示大气颗粒形成和相关的表面-大气颗粒交换所涉及的化学。提高对潜在过程的基本认识对于阐明气溶胶粒子在大气化学和全球气候系统中的作用至关重要。在空气卫生和公众健康方面，这一建议也将有助于设计和实施有效的控制策略等应用，以减少大气气溶胶负担。

This proposal aims at contributing to an advanced quantitative understanding of key processes in atmospheric aerosol dynamics. Innovative instrumentation urgently required for direct in-situ measurements of atmospheric formation of ultrafine particles (secondary particle formation) and their distribution / redistribution will be developed and established. For this purpose, state-of-theart particle instrumentation (thermal desorption chemical ionization mass spectrometry) will be modified and expanded for application in a micrometeorological technique (relaxed eddy accumulation). This unique development will allow for simultaneous quantification of the chemical composition and the turbulent transport of atmospheric nanoparticles in the ultrafine size range (below 10 nm diameter). Field deployment of the novel instrument will shed light on the chemistry involved in atmospheric particle formation and the associated surface-atmosphere exchange of particles. An improved fundamental understanding of the underlying processes is essential to elucidate the role of aerosol particles in atmospheric chemistry and the global climate system. With regard to air hygiene and public health, this proposal will also contribute to applications such as the design and implementation of effective control strategies to reduce the atmospheric aerosol burden.