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渝东南典型城区冬季一次罕见的PM2.5污染过程及溯源分析
Characteristics and Potential Source Contribution of PM2.5 During a Continuing Pollution Process in Typical Urban Area of Southeast Chongqing
投稿时间:2022-08-16  修订日期:2022-09-30
DOI:10.19316/j.issn.1002-6002.2023.05.10
中文关键词:  细颗粒物  污染特征  轨迹聚类  潜在源贡献
英文关键词:PM2.5  pollution characteristics  trajectory clustering  potential source contribution
基金项目:国家重点研发计划专项(2018YFC0214005);重庆市科研机构绩效激励引导专项(cstc2019jxjl20006)
作者单位
张凤 重庆市生态环境科学研究院, 重庆 401147
重庆市武隆区生态环境监测站, 重庆 500156 
李振亮* 重庆市生态环境科学研究院, 重庆 401147
城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147 
通讯作者:李振亮*  重庆市生态环境科学研究院, 重庆 401147;城市大气环境综合观测与污染防控重庆市重点实验室, 重庆 401147  
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中文摘要:
      2020年12月底,以生态旅游业为主的重庆市渝东南地区出现了一次较为罕见的PM2.5污染过程,持续时间长且污染程度重。以渝东南地区武隆区为例,应用污染特征雷达图、后向轨迹模型及潜在源污染贡献估算等方法分析了本次PM2.5污染的特征及来源,结果表明:①在污染前期主要受扬尘、燃煤和机动车等污染排放影响,污染源直接排放贡献较大;中、后期污染受二次颗粒物影响显著,扬尘影响也较为明显。②污染期间的气流轨迹均为短距离输送,轨迹主要来自东北方向(65%)。③除自身污染排放贡献外,渝东北地区和主城都市区是武隆区PM2.5污染的主要潜在源区,对武隆区传输贡献占比超50%。
英文摘要:
      At the end of December 2020,a relatively rare PM2.5 pollution process occurred in the southeast of Chongqing,which is dominated by eco-tourism,with a long duration and heavy pollution degree.Taking Wulong District in southeast Chongqing as an example,the characteristics and sources of PM2.5 pollution were analyzed by using radar chart of pollution characteristics,backward trajectory model and potential source contribution.The results showed that the emissions of dust,coal burning and motor vehicles were the main sources of PM2.5 at the early stage of pollution process,and the contributions of primary sources were higher than others.However,PM2.5 was significantly affected by the secondary particulate formation and dust source in the middle and later stages.The air trajectories were short transported distances from the northeast direction (65%) and the northwest direction (35%) during the pollution period.Furthermore,besides the contribution of local pollution sources,the northeast of Chongqing and major urban areas were the main potential sources of PM2.5,accounting for more than 50% during the pollution period.
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