Heterogeneous Hydroxyl (OH) Chemistry and Aerosol Optical Properties: Direct and Indirect Connections

这项工作旨在提高对气溶胶有机部分中化学复杂性如何直接影响颗粒与光的相互作用的理解。 该项目将研制和使用一台光腔衰荡气溶胶消光光谱仪和一台光声光谱仪。 在何种程度上由羟基（OH）自由基调制的气溶胶光学特性的初级有机气溶胶的非均质加工将进行研究，与眼睛对化学成分和可变性所发挥的作用。 气溶胶在调节地球气候以及为大气中的异质化学反应提供表面方面发挥着关键作用。 气溶胶对气候的直接影响取决于其散射或吸收光的能力，而散射或吸收光的能力主要取决于气溶胶的大小和化学成分，该项目的结果将通过提供关于有机气溶胶光学特性的急需的新信息而直接应用于气候模式。 该项目的其他更广泛影响将包括培训女研究生和大学生参与研究。 此外，该项目涉及与劳伦斯伯克利国家实验室的合作，并将使加州大学戴维斯分校的学生与非学术机构的研究人员接触。

This work aims to improve understanding of how chemical complexity within the organic fraction of aerosols can directly influence the interaction of particles with light. A cavity ring-down aerosol extinction spectrometer and a photoacoustic spectrometer will be developed and used in the project. The extent to which heterogeneous processing of primary organic aerosol by hydroxyl (OH) radicals modulates the aerosol optical properties will be investigated, with an eye toward the role played by chemical composition and variability. Aerosols play a crucial role in regulating Earth's climate as well as providing surfaces for heterogeneous chemical reactions in the atmosphere. The direct effect of aerosols on climate is determined by their ability to scatter or absorb light, which depends critically on both their size and chemical composition.Results from this project will be directly transferable to climate models by providing much needed new information on the optical properties of organic aerosol. Other broader impacts of this project will include the training of female graduate students and the participation of undergraduates in research. In addition, this project involves collaboration with Lawrence Berkeley National Laboratory and will bring University of California, Davis students into contact with researchers at a non-academic institution.