Cooperative Institute for Research in the Environmental Sciences and Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA.
Science. 2009 Dec 11;326(5959):1525-9. doi: 10.1126/science.1180353.
Organic aerosol (OA) particles affect climate forcing and human health, but their sources and evolution remain poorly characterized. We present a unifying model framework describing the atmospheric evolution of OA that is constrained by high-time-resolution measurements of its composition, volatility, and oxidation state. OA and OA precursor gases evolve by becoming increasingly oxidized, less volatile, and more hygroscopic, leading to the formation of oxygenated organic aerosol (OOA), with concentrations comparable to those of sulfate aerosol throughout the Northern Hemisphere. Our model framework captures the dynamic aging behavior observed in both the atmosphere and laboratory: It can serve as a basis for improving parameterizations in regional and global models.
有机气溶胶 (OA) 颗粒会影响气候强迫和人类健康，但它们的来源和演化仍未得到很好的描述。我们提出了一个统一的模型框架来描述 OA 在大气中的演化，该框架受到其组成、挥发性和氧化态的高时间分辨率测量的约束。OA 和 OA 前体气体通过不断氧化、降低挥发性和增加吸湿性而演化，导致形成含氧有机气溶胶 (OOA)，其浓度与整个北半球硫酸盐气溶胶相当。我们的模型框架捕捉到了在大气和实验室中观察到的动态老化行为：它可以作为改进区域和全球模型参数化的基础。
