Establishing the Linkages between Particle Physical, Chemical, and Optical Properties at the Kosan Supersite during Aerosol Characterization Experiment (ACE)-Asia

本项目的目的是确定气溶胶吸湿性增长对韩国济州岛高山超级站点气溶胶表征实验（ACE）亚洲粉尘和污染输入期间环境气溶胶光学特性的影响。特别令人感兴趣的是，尘埃的吸湿性和光学性质是否在尘埃经历人为影响期间发生显著改变。这项工作将利用收集到的关于气溶胶化学、物理和光学性质及相关参数的非常全面的数据集。预测环境气溶胶吸水性的热力学模型将得到扩展，以包括无机和有机化合物的复杂混合物以及亚洲尘埃。这项工作的结果将揭示颗粒大小、浓度和化学成分如何影响环境光消光系数、单散射反照率、相函数和埃氏指数，以及这些参数的波长依赖关系。闭合计算将测试我们对这些关系的理解，并提供有关现有测量技术和模型质量的信息，并指出未来最迫切需要的改进。与加州理工学院的John Seinfeld教授合作，一名研究生将参与该项目。

The goal of this project is to determine the influence of aerosol hygroscopic growth on the optical properties of ambient aerosols during dust and pollution input periods of the Aerosol Characterization Experiment (ACE) Asia at the Kosan Supersite on Cheju Island, Korea. Of special interest is whether the hygroscopic and optical properties of dust are significantly altered during periods when the dust has experienced anthropogenic influence. This work will take advantage of the very comprehensive data set that was collected on aerosol chemical, physical, and optical properties and related parameters. Thermodynamic models that predict water uptake by ambient aerosols will be extended to include complex mixtures of inorganic and organic compounds as well as Asian dust. Results from this work will reveal how particle size, concentration, and chemical composition impact the ambient light extinction coefficient, single-scatter albedo, phase function, and Angstrom exponent, as well as the wavelength dependencies of these parameters. Closure calculations will test our understanding of these relationships and provide information on the quality of available measurement techniques and models and point to the most urgently needed improvements in the future. In collaboration with Prof. John Seinfeld at CalTech, a graduate student will be involved in this project.