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颗粒暴露于主要大气氧化剂HOx自由基后光学性质的变化。散射系数对相对湿度的依赖性用配备加湿器的积分浊度计测量。除老化外，原本具有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确定气溶胶散射系数的湿度依赖性的作用，如在中国和夏威夷观察到的。

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.