黄山夏季气溶胶吸湿性及与化学组分闭合

Hygroscopic Properties and Closure of Aerosol Chemical Composition in Mt.Huang in Summer

大气气溶胶的吸湿性对其光学性质、云凝结核的活性以及人体健康都有重要影响.利用2014年7月在黄山光明顶观测获得的气溶胶的吸湿增长因子(GF)和多尺度气溶胶离子化学成分的观测数据,进行气溶胶吸湿性与化学组分的闭合研究.结果表明,黄山夏季气溶胶(在70~230 nm范围内)中硫酸铵、有机物(OC)、不可溶的物质含量最多,硝酸铵含量次之,硫酸氢铵含量最少,其中主要无机成分含量随着粒径的增加而逐渐增加;气溶胶在白天的吸湿性强于夜间,并且气溶胶粒子的吸湿性随粒径增加有逐渐增强的趋势;根据所有粒径的气溶胶粒子化学组分计算出的吸湿性参数κ值与κ观测值呈现大致相同的波动变化趋势,并且较接近观测值,决定系数r^2达到0.60.

The hygroscopic properties of aerosol have significant impact on aerosol optical properties, cloud condensation nuclei activity and human health. Aerosol particles growth factor and size-resolved ions chemical compositions were monitored in Mt. Huang. The hygroscopic properties of aerosol particles in Mt. Huang were studied. The results demonstrated that between 70 nm and 230 nm, the mass fractions of （NH4 ） 2 SO4 , organic matter and other insoluble materials were the highest. The fraction of NH4 NO3 standed in the medium. The fraction of NH4 HSO4 was the lowest. The fraction of inorganic salts increased with increasing particle diameter. Aerosol particles during daytime had stronger hygroscopicity than that at night and the hygroscopicity of aerosol became stronger when its diameter increased. The calculation hygroscopic parameter k of aerosol particles showed similar diurnal variation characteristics to the observation k. Good closure could be achieved when ZSR mixing rule was used based on aerosol chemical composition to calculate aerosol hygroscopic parameter k and the coefficient of determination was 0. 60 for all the diameters.