Black carbon during haze processes impact on aerosol scattering hygroscopic growth
Based on the hourly observed"dry"aerosol scattering coefficient,aerosol absorption coefficient,and the environmental meteorological monitoring data,and the retrieved aerosol particle size hygroscopic growth factor(Gf)from October to December 2017 in Chengdu,the statistical characteristics of black carbon concentration(CBC)were analyzed under four kinds of haze intensity conditions.Besides,the influence mechanism for CBC on the aerosol scattering hygroscopic growth was investigated using the aid of Generalized Additive Model(GAM).The results show that:(1)CBC obeyed lognormal distribution under slight,mild,moderate,and severe haze conditions.The averaged value of CBC increased but the variation coefficient of CBC decreased with increasing haze intensity.(2)CBC showed nonlinear negative correlations with Gf,and nonlinear positive correlations with CPM2.5/PM10(mass concentration ratio between fine particulate matter and coarse particulate matter)(passing the α=0.01 significant test).Haze development intensified the downward trend of Gf with CBC and reduced the upward trend of CPM2.5/PM10 with CBC.(3)There were significant interactions between CPM2.5/PM10and Gf(passing the α=0.001 significant test).The bivariate GAM model with Gf and CPM2.5/PM10 could better characterize the variation on f.
万方数据
维普
