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组分中的化学复杂性如何直接影响颗粒与光的相互作用的理解。空腔衰荡气溶胶消光光谱仪和光声光谱仪将在该项目中使用。将研究羟基(OH)自由基对初级有机气溶胶的异相处理对气溶胶光学性质的调节程度，并着眼于化学成分和可变性所起的作用。气溶胶在调节地球气候以及为大气中的不同化学反应提供表面方面发挥着至关重要的作用。气溶胶对气候的直接影响取决于它们散射或吸收光的能力，而这一能力主要取决于它们的大小和化学成分。该项目的结果将通过提供关于有机气溶胶光学性质的迫切需要的新信息，直接转移到气候模型中。该项目的其他更广泛的影响将包括培训女研究生和本科生参与研究。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接触到非学术机构的研究人员。

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.