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Black Carbon Aerosol in the Industrial City of Xuzhou, China: Temporal Characteristics and Source Appointment

Category: Urban Air Quality

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.07.0245
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Wei Chen1, Huimin Tian1, Kai Qin 2

  • 1 College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
  • 2 School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

Highlights

Two years’ measurements of black carbon in Xuzhou were presented.
Average BC concentration in Xuzhou is about 2.4 µg m–3.
BC concentrations in Xuzhou are highly correlated with PM1.
Central China’s contribution a lot to Xuzhou’s pollution in winter.


Abstract

Black carbon (BC) aerosol in urban environments has potential effects on the local environment, regional climate cycle, and even human health. A two-year field measurement (May 2014 to July 2016), of BC and particulate matter in Xuzhou, a large industrial city and the economic center city of Huaihai Economic Zone in central China, was conducted. The average annual concentrations of BC, PM1.0, PM2.5, and PM10 were 2.44 μg/m3, 56.6 μg/m3, 61.8 μg/m3, and 75.8 μg/m3, respectively. The maximum daily average BC concentration was 11.6 μg/m3, and more than 10% of the hourly measurements had BC concentrations higher than 5 μg/m3. The BC and PM concentrations all had two peaks (rush hours in the morning and night) and one valley (afternoon), considering diurnal variations. In regard to seasonal variation, the BC concentrations were higher in the winter and spring, while the PM concentrations were higher in the winter and autumn. Furthermore, the BC ratios in PM were also higher in the winter and spring. The backward trajectory analysis demonstrated that most high-BC concentration hours were associated with north and northwest winds. The potential source contribution function (PSCF) model proves that provinces of central China were the most likely BC source regions for Xuzhou. Our study provides insights into potential atmospheric pollution control measures for provinces of central China, and it is also useful for further air quality forecasting studies.

Keywords

Black carbon Particulate matter PM2.5 Air pollution


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