RAPID: Nanoparticle Growth from Anthropogenic Volatile Organic Compounds (AVOC) during CLOUD11

该项目将使人们能够参与将在瑞士日内瓦欧洲核子研究中心的云室设施进行的CLOUD11实地活动(2016年9月至11月)。云设备的独一无二之处在于它的清洁度，对各种环境条件的独特控制，证明有能力实现与大气中发现的条件非常相似的实验条件，并可以使用科学团队提供的大量最先进的仪器，在分子水平上研究气体和气溶胶的组成。这项研究的更广泛影响包括提高对与空气质量和气候有关的气雾剂来源的了解。CLOUD11实地活动有以下目标：(1)进行人为挥发性有机化合物(AVOC)的成核实验；(2)进行生物挥发性有机化合物(BVOC)的成核实验；以及(3)开展以OH自由基引发的AVOC和BVOC的氧化以及不同浓度的SO2、NOx、NH3和相对湿度(RH)的实验。这项研究支持部署CE-DOAS仪器来测量芳香族AVOC的主要第一代氧化产物乙二醛和甲基乙二醛。这项工作包括研究挥发性(和可溶性)分子的“盐化”，作为克服开尔文效应的一种机制，从而有效地生长中性稳定的纳米团簇。在纳米星团生长的背景下，对相对湿度驱动的“盐化”进行系统研究，有可能成为追踪纳米粒子与多少水相关的“探测器”，以及它们是否可以增长到可以作为云凝结核(CCN)影响云形成的大小。

This project will enable participation in the CLOUD11 field campaign that will take place at the CLOUD chamber facility at CERN in Geneva Switzerland (Sept - Nov 2016). The CLOUD facility is unique because of its cleanliness, unique control over a wide range of environmental conditions, demonstrated ability to realize experimental conditions that closely resemble those found in the atmosphere, and access to a large array of state-of-the-art instrumentation provided by the Science team to study gas- and aerosol composition at the molecular level. The broader impacts of this research include improved knowledge about the sources of aerosols relevant to air quality and climate. The CLOUD11 field campaign has the following objectives: (1) Conduct nucleation experiments of anthropogenic volatile organic compounds (AVOC); (2) Conduct nucleation experiments involving biogenic volatile organic compounds (BVOC); and (3) Conduct experiments that focus on OH radical initiated oxidation of AVOC and BVOC, and varying concentrations of SO2, NOx, NH3, and relative humidity (RH). This research supports the deployment of a CE-DOAS instrument to measure glyoxal and methylglyoxal, major first generation oxidation products from aromatic AVOC. This effort includes the investigation of the "salting-in" of volatile (and soluble) molecules as a mechanism to overcome the Kelvin effect towards the efficient growth of neutral stabilized nanoclusters. A systematic study of RH driven "salting-in" in context of nanocluster growth holds potential as a "probe" to trace how much water is associated with nanoparticles and whether they can grow to sizes where they can act as cloud condensation nuclei (CCN) influencing the formation of clouds.