Abstract：In this study, we targeted at black carbon (BC) in PM2.5in YRD and deployed a single particle soot photometer (SP2) in Wuxi City of Jiangsu Province to perform on-line characterization of major BC aerosol properties, e.g., concentrations, size distribution, and mixing state. The measurement was conducted during both the summer and winter campaigns of 2010~2011. The main finding was that, the BC pollution level increased by 2.4times from the summer (2.5μg/m3) to the winter (6.1μg/m3), together with a significant increase of the number fractions of internally mixed BC (NIB) from 44.6 to 64.8%. The high NIB level in the winter indicates that air mass transport of aged BC particles from North China was the primary reason to form the high BC pollution in the winter of Wuxi, which was further supported by the back trajectory analysis. The diurnal variations of the BC mass concentration and NIB during the campaigns showed opposite trends, with the lowest BC concentrations but the highest NIB in the daytime, reflecting the role of coating processes by photochemical production of secondary materials. In addition, the size distributions of BC in volume equivalent diameter (VED) were found to have stable lognormal patterns during the campaigns, with the peak diameter at ~120nm for the number distribution and at ~225nm for the mass distribution.
孙天乐, 何凌燕, 曾立武, 黄晓锋. 无锡市大气PM2.5中黑碳的粒径分布与混合态特征[J]. 中国环境科学, 2015, 35(4): 970-975.
SUN Tian-Le, HE Ling-Yan, ZENG Li-Wu, HUANG Xiao-Feng. Characteristics of black carbon aerosol in Wuxi. CHINA ENVIRONMENTAL SCIENCECE, 2015, 35(4): 970-975.
