关中五市不同季节污染颗粒物输送路径及潜在源分析

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摘要基于HYSPLIT后向轨迹模型及TrajStat中的PSCF和CWT分析法,利用2020年3月~2023年2月气象数据,对关中五市PM_2.5污染的时间分布特征及主要输送路径进行了分析,并探讨了不同季节影响关中五市PM_2.5质量浓度的潜在源区分布及贡献.结果表明:关中五市PM_2.5、PM₁₀浓度具有显著的季节变化特征,冬季PM_2.5浓度均值最高(84.36μg/m³),夏季最低(21.42μg/m³),月份趋势均呈现“U”型的特点,6~8月浓度达到谷值;5个城市四季均受到来自西北方向的长距离传输气团及陕西局地短距离传输气团的影响,该城市空气质量受陕西省内部短距离传输气团影响大,应与气流遇秦岭山脉阻挡回旋有关;潜在源区季节差异明显,春夏污染物浓度最低,主要贡献源区分布范围最小,冬季最广,WCWT值超过100μg/m³的范围大,西北方向带状分布区域和陕西省南部及与其周围省份交界处对5个城市PM_2.5浓度贡献度较大;大气污染还受地形影响,类属于盆地地形的铜川污染分布与其他四个城市存在差异,污染浓度相对较低.

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关键词 ：关中五市, PM_2.5, 后向轨迹, 输送路径, 潜在源区

Abstract：Based on the HYSPLIT backward trajectory model and the PSCF and CWT analysis methods in TrajStat, the temporal distribution characteristics and main transport paths of PM_2.5 pollution in the five cities of Guanzhong were analyzed using the meteorological data from March 2020~February 2023, and the distribution and contribution of potential source areas affecting the PM_2.5 mass concentration in the five cities of Guanzhong in different seasons were discussed. The average PM_2.5 concentration was the highest in winter (84.36μg/m³) and the lowest in summer (21.42μg/m³), and the monthly trend showed a "U" shape, and the concentration reached a trough in June~August. The air quality of the five cities was greatly affected by the short-distance transmission air mass in Shaanxi Province in all seasons, which should be related to the blocking of the maneuver by the Qinling Mountains. The seasonal differences in the potential source areas were obvious, the pollutant concentration was the lowest in spring and summer, the distribution range of the main contributing source area was the smallest, the most extensive in winter, the range of WCWT value exceeding 100μg/m³ was large, and the distribution area in the northwest direction and the southern part of Shaanxi Province and its surrounding provinces contributed more to the PM_2.5 concentration in the five cities. Air pollution is also affected by topography, and the pollution distribution of Tongchuan, which belongs to the basin topography, is different from that of the other four cities, and the pollution concentration is relatively low.

Key words： five cities in Guanzhong PM_2.5 backward trajectory transport pathway potential sources

收稿日期: 2024-01-04

PACS:

X513

基金资助:教育部人文社会科学研究青年基金项目(21YJCZH138);中国博士后基金项目(2020M683433);陕西省自然科学基础研究计划(2021JQ-517)

作者简介: 苏佳(1991-),女,陕西西安人,副教授,博士,主要从事大气环境污染与控制研究.发表论文10余篇.sujia9108@163.com.

引用本文:

苏佳, 李晓萌, 张新生. 关中五市不同季节污染颗粒物输送路径及潜在源分析[J]. 中国环境科学, 2024, 44(8): 4249-4259. SU Jia, LI Xiao-meng, ZHANG Xin-sheng. Analysis of transport path and potential source of polluted particulate matter in five cities of Guanzhong in different seasons. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4249-4259.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I8/4249

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