庐山地区黑碳气溶胶变化特征及影响因素分析

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Abstract The characteristics, influencing factors and sources of black carbon (BC) aerosol in Mt. Lushan were analyzed with BC observations from 2018 to 2020, together with meteorological variables, air pollutant data and backward trajectory model. The results showed that the average BC concentration in Mt. Lushan displayed a decreasing trend in the study period, with an annual average BC concentration of (0.606 ± 0.474) μg/m³ for the three years, but the background BC concentration increased by about 0.035μg/m³ per year. For the monthly variation of BC concentration, its minimum value occurred in July [(0.455 ± 0.184)μg/m³] and the maximum value occurred in January [(0.742 ± 0.603)μg/m³]. The diurnal variation of BC concentrations showed a unimodal distribution with maximum values in the midday and afternoon, and the BC concentrations were higher on weekends than on weekdays in all seasons, our findings at Mt. Lushan were in contrast to the results in urban areas. The BC/PM_2.5 ratio decreased with increasing PM_2.5 concentrations (5.2% to 2.4%) during the observation period, and the average ratio was 3.4%. The correlation coefficients of BC with SO₂ and NO₂ were 0.27 and 0.26, respectively, but no significant correlation was found between BC and CO, indicating that the local source emissions in Mt. Lushan had ignorable influence and BC were mainly related to meteorological processes such as regional transport or downhill vertical transport. The results of backward trajectory and PSCF indicated that the BC source of Mt. Lushan varied from season to season. In winter and spring, Mt. Lushan was mainly influenced by the air mass from northwest China and North China, and the BC potential source regions were primarily from Shaanxi, Henan, Hubei and Yangtze River Delta (YRD). The air mass in autumn was mostly from the YRD and North China, while the air mass was mainly from the southeast coast in summer, and the corresponding potential source contribution region of BC was similarly distributed.

Key words： Mt. Lushan black carbon aerosol air pollutant meteorological conditions PSCF background station

Received: 15 February 2023

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X513

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	Articles by authors
	LIU Cheng
	DENG Li-chen
	QIAN Yue
	YAN Ai-jun
	FANG Xiao-zhen
	PAN Yuan-yuan
	GUO Wei
	XIE Ya-jun

Cite this article:

LIU Cheng,DENG Li-chen,QIAN Yue等. Characteristics and influencing factors of black carbon aerosol in Mountain Lushan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4512-4524.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4512

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