中国东部秋季大气黑碳分布和来源的数值模拟

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Abstract In this paper, the regional atmospheric chemistry WRF-Chem model coupled with black carbon source tracing method was used to study the distribution characteristics of black carbon (BC) in autumn in eastern China. It was found that the BC concentration in central and eastern China was higher (>2%)μg/m³), and BC high value area (>4μg/m³) was distributed in North China Plain, Yangtze River Delta, two lakes, Eastern Sichuan and other regions. Industrial sources, residential sources and traffic sources were the main sources of black carbon emission. Among them, industrial sources can cause the distribution of near stratum BC to be in point shape and high value. Terrain and meteorological conditions were also important factors affecting the accumulation and transmission of BC. For the North China Plain with high BC concentration, the source and daily variation characteristics of Beijing-Tianjin-Hebei BC in the heavily polluted area were analyzed. It was found that Beijing-Tianjin-Hebei BC was mainly contributed by local sources, and the contribution proportion of outside sources to Beijing-Tianjin-Hebei BC varied greatly under different wind fields and atmospheric diffusion conditions. The BC sources feature can be divided into two types:1) transport type:the surface wind speed was large, and the contribution of external sources accounted for 35.1%. 2) Stable type:the surface wind speed was small, the atmospheric conditions were static and stable, mainly local contribution (80.1%), and less contribution (6.9%) from provinces around Beijing-Tianjin-Hebei (Shandong, Henan, Shanxi and Shaanxi). The diurnal variation characteristics of the contribution ratio of local and outside sources to BC in Beijing, Tianjin and Hebei were opposite. From evening to the next morning, the proportion of local BC contribution remained at a high level; In the afternoon, the proportion of local contribution decreased and the external transportation increased significantly. When Beijing-Tianjin-Hebei region was more affected by external transportation, the daily variation characteristics were more obvious, and the external contribution can account for more than 40% in the afternoon. The results of this study can provide a scientific basis for ambient air quality assessment and pollution control in Beijing-Tianjin-Hebei region.

Key words： black carbon WRF-Chem source tagging Beijing-Tianjin-Hebei

Received: 11 March 2022

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X513

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	ZHANG Xu-ying
	ZHU Bin
	WANG Yuan-min
	QIAN Wei-miao

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ZHANG Xu-ying,ZHU Bin,WANG Yuan-min等. Numerical simulation of black carbon distribution and sources in autumn over eastern China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4465-4474.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4465

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