Black carbon variation during a high pollution haze episode in Beijing, China
- 作者：Qingyang LiuYanju LiuYi GaoMeigen ZhangRenjian ZhangHui DingXuekui Qi
- 会议时间：2013-05-16
- 关键词：Black carbon aerosol ; Haze formation ; Diurnal pattern ; Seasonal trend.
- 作者单位：Qingyang Liu(Beijing Center for Physical and Chemical Analysis, Beijing, 100089, China;College of Resources and Environment, University of Chinese Academy of Sciences, Beijing,100049, China)Yanju Liu(Beijing Center for Physical and Chemical Analysis, Beijing, 100089, China;Beijing Milu Ecological Research Center, Beijing, 100076, China)Yi Gao,Meigen Zhang,Renjian Zhang(State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China)Hui Ding(Beijing Academy of Sciences and Technology, Beijing, 100089, China)Xuekui Qi(Beijing Center for Physical and Chemical Analysis, Beijing, 100089, China)
- 母体文献：第十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会论文集
- 会议名称：第十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会
- 会议地点：武汉
- 主办单位：中国颗粒学会
- 语种：chi
摘要
Black carbon (BC) aerosol is esthetically displeasing as it is responsible for the brown appearance of urban hazes.In this study,atmospheric BC aerosol was measured using an aethalometer (AE-31) at an urban location of Haidian District,Beijing from May 2012 to March 2013.A logarithmic negative correlation (R2=0.5120) between BC and visibility suggested that BC was an important air pollution factor to affect air quality in Beijing.BC concentration showed significant seasonal variation with mean concentration varying between 4.24 μg m-3(summer) to 8.14μg m-3 (winter).The highest daily mean concentration was recorded as high as 27.69 μg m-3.The highest concentration of BC occurred during a high pollution haze episode in winter.In a clear day,BC exhibited a distinct diurnal pattern,with three maximum peaks within a day.However,BC exhibited a multi–peak diurnal pattern during haze episodes from Dec 2012 to Jan 2013.Statistical factors analysis demonstrated that emission source factors were not increased,leading to multi-peak diurnal pattern in BC variation.Additionally,Weather Research and Forecasting Model showed that the boundary layer height during haze episodes hourly varied in a similar trend with normal days.All the evidence indicated that BC exhibited a rather higgledy-piggledy diurnal pattern during haze episodes,which played a key role in the stabilization of haze formation.