Atmospheric Organic Aerosol-Water Interactions

在污染地区和清洁地区，有机化合物平均占细微气溶胶质量的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。它们还通过能见度降低以及通过我们呼吸的空气对健康产生影响而构成重大环境风险。气溶胶的有机气溶胶（OA）部分的化学复杂性使其性质的表示，建模和理解显着具有挑战性。这里要调查的一系列研究涵盖了一系列主题，包括：有机化合物在增加相对湿度（RH）时促进（或抑制）无机颗粒物生长的能力，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，以及半挥发性有机蒸汽的亨利定律常数的系统估计。该研究将结合实验室实验、实地测量和数学建模，目标是将OA成分的数学表示纳入化学传输模型，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 .