庐山地区黑碳气溶胶变化特征及影响因素分析

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摘要利用2018~2020年庐山观测站的黑碳气溶胶(BC)浓度,结合气象数据、污染物数据及后向轨迹模型,对该地区BC变化特征、影响因素和来源进行分析.结果表明,2018~2020年庐山BC平均浓度呈下降趋势,3a BC年平均浓度为(0.606 ±0.474) μg/m³,但BC本底浓度每年增加约0.035 μg/m³.从月变化上来看,BC浓度最小值出现在7月(0.455 ±0.184) μg/m³,最大值出现在1月(0.742 ±0.603) μg/m³.BC浓度日变化呈单峰型分布,在正午及午后出现最大值,各个季节BC浓度在周末均高于工作日,与城市地区结果明显相反.观测期间,BC/PM_2.5占比随PM_2.5浓度增加而减小(5.2%减少至2.4%),平均占比为3.4%.BC与SO₂和NO₂的相关系数分别为0.27和0.26,但与CO无显著相关,表明庐山地区局地源排放其自身影响较小,BC主要与区域输送或山下垂直传输等气象过程相关.后向轨迹和PSCF潜在源贡献结果表明庐山BC来源存在季节差异,冬春季主要受来自西北和华北气团影响,潜在贡献源主要在陕西−河南−湖北一带及长三角地区.秋季气团主要来自长三角和华北地区,而夏季气团主要来自东南沿海,对应的潜在源贡献区呈类似分布.

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	刘诚
	邓力琛
	钱悦
	闫爱军
	方小珍
	潘媛媛
	郭威
	谢亚军

关键词 ：庐山, 黑碳气溶胶, 污染物, 气象条件, 潜在源贡献, 背景站

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

收稿日期: 2023-02-15

PACS:

X513

基金资助:江西省自然科学基金资助项目(20202BAB213019)；江西省大气污染成因与控制重点实验室开放基金资助项目(1412000020)；国家自然科学基金资助项目(42105088)

通讯作者: 邓力琛,工程师,306910828@qq.com E-mail: 306910828@qq.com

作者简介: 刘诚(1990-),男,江西湖口人,副研究员,博士,主要从事大气环境与边界层气象研究.发表论文10余篇.liuc215@ecut.edu.cn

引用本文:

刘诚, 邓力琛, 钱悦, 闫爱军, 方小珍, 潘媛媛, 郭威, 谢亚军. 庐山地区黑碳气溶胶变化特征及影响因素分析[J]. 中国环境科学, 2023, 43(9): 4512-4524. LIU Cheng, DENG Li-chen, QIAN Yue, YAN Ai-jun, FANG Xiao-zhen, PAN Yuan-yuan, GUO Wei, XIE Ya-jun. Characteristics and influencing factors of black carbon aerosol in Mountain Lushan. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4512-4524.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I9/4512

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