Heterogeneous reactions with HOx radicals and property changes in organic aerosol particles

在实验室中测量了有机气溶胶粒子在暴露于主要大气氧化剂HOx自由基后的光学性质的变化。用配有加湿器的积分式浊度计测量了散射系数与相对湿度的关系。除了老化外，原本具有较大吸湿性的有机物的存在可以控制大气有机气溶胶的光学性质。这些发现被用来解释有机物在决定中国和福夸岛观测到的气溶胶散射系数对湿度的依赖性中所起的作用。

Changes in the optical properties of organic aerosol particles upon exposure to HOx radicals, major atmospheric oxidants, were measured in the laboratory. Dependence of the scattering coefficient on the relative humidity was measured with an integrating nephelometer equipped with a humidifier. In addition to aging, presence of organics originally having large hygroscopicity could control the optical properties of the atmospheric organic aerosols. These findings were used to interpret the roles of organics in determining the humidity dependence of the aerosol scattering coefficient as observed in China and Fukue Island.