College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China.
College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China.
Sci Total Environ. 2020 Apr 20;714:136820. doi: 10.1016/j.scitotenv.2020.136820. Epub 2020 Jan 21.
Black carbon (BC) is an important component of atmospheric aerosols; BC aerosols are produced mainly by the incomplete combustion of carbon-containing substances, and they have important effects on climate change, the atmospheric environment, and public health. Most of the existing research has focused on the single-band measurement results of BC aerosols. However, each band offers different information regarding the optical absorption properties of aerosols, such as enhanced light absorption by brown carbon in the 370 nm band. To bridge this research gap, the present study used BC concentration data measured by an AE42 aethalometer to analyze the multiband pollution characteristics of BC aerosols in Xuzhou city in China. An aethalometer model was established to quantitatively describe the concentrations of BC produced by solid and liquid fuels, and a concentration-weighted trajectory analysis was used to analyze the potential sources of BC aerosols in Xuzhou and their contributions to the total BC. The following results were obtained. (1) The BC concentration was high in spring and winter and low in summer and autumn, and the diurnal variation showed bimodal characteristics. (2) The difference among the aerosol concentrations in the seven bands was larger in autumn and winter than in spring and summer, and the contribution of brown carbon in autumn and winter was greater than that in spring and summer. (3) In winter, the solid source (coal and biomass combustion) of BC accounted for a large proportion of the total BC. (4) A source analysis of BC pollution days and BC clean days indicated different sources of BC pollution in different seasons. The results of this study provide a theoretical basis and realistic guide for the prevention and control of atmospheric pollution in Xuzhou and are anticipated to be of great significance for improving the regional and global atmospheric environment.
黑碳（BC）是大气气溶胶的重要组成部分；BC 气溶胶主要由含碳物质的不完全燃烧产生，对气候变化、大气环境和公众健康有重要影响。现有的大多数研究都集中在 BC 气溶胶的单波段测量结果上。然而，每个波段都提供了有关气溶胶光学吸收特性的不同信息，例如 370nm 波段中棕色碳的增强光吸收。为了弥补这一研究空白，本研究利用 AE42 黑碳仪测量的 BC 浓度数据，分析了中国徐州市 BC 气溶胶的多波段污染特征。建立了一个黑碳仪模型来定量描述固体和液体燃料产生的 BC 浓度，并使用浓度加权轨迹分析来分析徐州市 BC 气溶胶的潜在来源及其对总 BC 的贡献。得到以下结果：（1）BC 浓度在春季和冬季较高，在夏季和秋季较低，日变化呈双峰特征。（2）七个波段的气溶胶浓度差异在秋季和冬季比春季和夏季大，秋季和冬季棕色碳的贡献大于春季和夏季。（3）在冬季，BC 的固体源（煤和生物质燃烧）占总 BC 的比例较大。（4）对 BC 污染日和 BC 清洁日的源分析表明，不同季节的 BC 污染有不同的来源。本研究的结果为徐州市大气污染防治提供了理论依据和现实指导，对改善区域和全球大气环境具有重要意义。
