Atmospheric Organic Aerosol-Water Interactions

在污染区和清洁区，有机化合物平均占细气溶胶质量的30 - 70%。它们通过自身的光学特性及其对云和降水的影响，对气候的直接和间接气溶胶辐射强迫作出贡献。它们还通过能见度下降造成重大环境风险，并通过我们呼吸的空气影响健康。气溶胶中有机气溶胶（OA）部分的化学复杂性使得其性质的表示、建模和理解具有显着的挑战性。这里要调查的一系列研究涉及一系列主题，包括：* 有机化合物促进（或抑制）无机颗粒物质随相对湿度（RH）增加的生长，* RH对半挥发性OA组分在气相和颗粒相之间分配的影响，* 环境OA的水溶性分布，* 和半挥发性有机蒸气的亨利定律常数的系统估算。该研究将涉及实验室实验，现场测量和数学建模相结合，目标是将OA组分的数学表示纳入化学运输模型，旨在跟踪和预测OA分布。

Organic compounds represent on average 30-70% of the fine aerosol mass in both polluted and clean areas. They contribute to the direct and indirect aerosol radiative forcing of climate via their own optical properties and their effects on clouds and precipitation. They are also pose significant environmental risks via visibility degradation, and health effects through the air that we breathe. The chemical complexity of the organic aerosol (OA) fraction of aerosols makes the representation, modeling and understanding of their properties notably challenging. A range of studies to be investigated here covers a range of topics, including: * the ability of organic compounds to promote (or inhibit) the growth of inorganic particulate matter with increasing relative humidity (RH),* the effect of RH on the partitioning of semi-volatile OA components between the gas and particulate phases, * the water solubility distribution of ambient OA, * and the systematic estimation of Henry's law constants of semi-volatile organic vapors. The study will involve a combination of laboratory experiments, field measurements, and mathematical modeling, with a goal of incorporating the mathematical representation of OA components into chemical transport models, designed to track and forecast OA distribution .