Source apportionment of black carbon in autumn and winter in a southern city of Northern China:Based on the improved black carbon meter model
The concentration of black carbon(BC)was measured in Luohe City,southern North China,from September 1,2022,to February 28,2023,using a 7-band black carbon meter(AE33),and the variation characteristics of black carbon in autumn and winter in Luohe City were analyzed,and the source apportionment was carried out using the improved potassium ion dynamic constrained black carbon meter model.In addition,the effects of fireworks on eBCEC and K+during the New Year's Day and Spring Festival were analyzed,in order to provide reasonable suggestions for BC pollution control in cities in southern North China.The results showed that the average concentration of eBCEC in autumn and winter was 3.62μg/m3,the concentration in winter(5.17μg/m3)was about 2.4times that the autumn concentration(2.15μg/m3),and the daily concentration of eBCEC revealed a'bimodal'distribution with peaks at 8:00 and 21:00.Using the improved black carbon meter model,it was found that the contribution of BC in autumn and winter was mainly from fossil fuel combustion(74.69±15.63％),followed by biomass combustion contribution(25.31±15.63％),and it was more effective to control the reduction of BC pollution from fossil fuel combustion sources.The average daily concentrations of eBCEC during fireworks and fireworks firing periods such as New Year's Day,Lantern Festival,and Spring Festival were 11.45,8.42 and 8.12μg/m3,respectively,which were 2.6,1.9 and 1.8 times of that during non-fireworks and fireworks periods,respectively.The average daily concentrations of K+during Spring Festival,Lantern Festival,and New Year's Day were 26.11,16.23,and 5.79μg/m3,respectively,which were 6.9,6.3,and 3.6 times of that during non-fireworks and fireworks periods,respectively.The increased rate of K+concentration during the above fireworks discharge period is significantly higher than that of eBCEC,which will interfere with the results of the constrained model.It is recommended that the data for the fireworks discharge period be excluded when using the model.
black carbonaethalometerabsorption Ångström exponentfirecrackerssource apportionment
万方数据
