基于气溶胶分级化学组分的吸湿增长参量研究及应用

The size-resolved aerosol hygroscopic growth parameters (κ) are quite important to related research or operation works. But the systematic and functional method for quantification of size-resolved κ is still lacking. In this project, the number size distributions, the size-resolved chemical compositions, and the light scattering hygroscopic growth factors f(RH) of fine particles are planned to be synchronously measured in Beijing. Based on comprehensive consideration of various factors, the quantification method for aerosol hygroscopic growth parameters in different size ranges (κ-size) will be established. Then the applicability of quantification method is going to be evaluated by the comparison between the κ-size and the equivalent κ-equ obtained from the f(RH) measurements. And the representative κ-size under different conditions in Beijing will be determined. Combined with the Mie model, the representative κ-size will be applied to the calculation of atmospheric extinction coefficient and the effect evaluation of optical closure.

气溶胶多等级分粒径吸湿增长参量，对于开展相关科研和业务工作非常重要，目前尚缺乏系统可行的定量方法。本研究拟在北京地区开展气溶胶精细化理化特征、光学特征、吸湿特性等的系统观测，将分级化学组分信息与气溶胶吸湿性相结合，综合考虑多种影响因素，系统建立基于分级化学组分的气溶胶吸湿增长参量（κ-size）确定方法；将计算得到的分粒径κ-size值，与利用f(RH)观测和数谱观测获取的整体等效κ-equ值进行比较，评估分粒径κ-size值确定方法的适用性及影响因素，并给出北京地区不同季节及不同条件下各粒径区间气溶胶的代表性κ-size值；结合Mie散射模型，将代表性κ-size值应用于大气消光系数及能见度的计算中，分析光学闭合效果。

气溶胶多等级分粒径吸湿增长参量，对于开展相关科研和业务工作非常重要，目前尚缺乏系统可行的定量方法。本研究拟在北京地区开展气溶胶精细化理化特征、光学特征、吸湿特性等的系统观测，将分级化学组分信息与气溶胶吸湿性相结合，综合考虑多种影响因素，系统建立了基于分级化学组分的气溶胶吸湿增长参量（κ-size）确定方法；将计算得到的分粒径κ-size值，与利用f(RH)观测和数谱观测获取的整体等效κ-equ值进行比较，评估分粒径κ-size值确定方法的适用性及影响因素，并给出了北京地区不同季节及不同条件下各粒径区间气溶胶的代表性κ-size值；结合Mie散射模型，将代表性κ-size值应用于大气消光系数及能见度的计算中，分析光学闭合效果。