• 关键词：四川盆地  PM_2.5污染特征  近地面风场  污染物输送通道

• 基金项目：国家重点研发计划（No.2018YFC0214003，2016YFA0602004）；国家自然科学基金重大研究计划重点支持项目（No.9164426）

• 罗青
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 廖婷婷
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 王碧菡
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 江慧娴
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 王思慧
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 欧阳正午
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 林大诚
• 民航华北地区空中交通管理局内蒙古分局, 呼和浩特 010000

• 孙玺
• 成都信息工程大学大气科学学院, 高原大气与环境四川省重点实验室, 成都 610225

• 摘要：利用2017年四川盆地18个城市PM_2.5小时浓度数据、欧洲气象中心ERA-Interim再分析资料对四川盆地污染特征及不同季节近地面风场特征进行统计分析.通过分异指数和相关性分析各城市PM_2.5逐小时浓度，结合近地面风场特征分析出四川盆地污染物变化趋势最相似的城市组合，探索污染物传输特征.研究发现，分异指数和相关性分析得到的传输通道城市组合与地面风场基本相符.四川盆地污染物输送途径可能包括以下3条路径，第1条"川西通道"：污染物随气流沿广元→绵阳东南部→德阳→成都、眉山北部→雅安流动；第2条"川中通道"：污染物随气流沿巴中→南充北部→遂宁北部、绵阳东南部→资阳北部→眉山东部→乐山北部流动；第3条"川东通道"：污染物随气流沿重庆北部→达州、广安→南充南部→遂宁中部→资阳东部→内江、自贡→宜宾、泸州流动.川西通道城市污染排放量大，容易引起连片污染，对应城市群应实施联防联控；川东通道末端在川南城市群和重庆形成风场辐合，造成污染物的滞留和累积，因此，建议在中长期产业布局中减少川南城市群的重污染企业.

• Abstract：The PM_2.5 hourly concentration data of 18 cities published by MEP in 2017 and the reanalysis data of the European meteorological center ERA-Interim was used to discuss the pollution characteristics of Sichuan Basin and the seasonal characteristics of the near-surface wind field in the Sichuan Basin respectively. The hourly concentration of PM_2.5 in each city was analyzed through coefficient of divergence index and correlation, and the combination of city with the most similar trend of pollutant change (PM_2.5) in Sichuan Basin was analyzed based on the characteristics of near-surface wind field, so as to explore the characteristics of pollutant transmission. We found that the city combination of transmission analyzed by coefficient of divergence index and correlation is basically consistent with the results analyzed by surface wind field. The transport pathways of pollutants in the Sichuan Basin may include the following three routes, the first "pathway in western Sichuan Basin" is Guangyuan, South East of Mianyang, Deyang, Chengdu and Miangyang North, and Ya'an. The second "pathway in mid Sichuan Basin" is Bazhong, Nanchong North, northern Suining and South East of Mianyang, northern Ziyang, eastern Meishan and Leshan north. The third path is called "pathway in eastern Sichuan Basin", air flows along Chongqing North, Dazhou, Guangan, Nanchong South, central Suining, eastern Ziyang, Neijiang and Zigong, and finally arrives in Yibin and Luzhou. The cities along the western pathway have a large amount of pollutants emission, which is easy to cause continuous pollution. So joint prevention and control should be implemented in corresponding city clusters. The wind field converges at the end of the eastern pathway, with city clusters in southern Sichuan and Chongqing, resulting in the retention and accumulation of pollutants. Therefore, it is suggested to reduce heavy polluted enterprises in city clusters which locate in southern Sichuan in the medium and long term industrial layout.

• Key words：Sichuan Basin  characteristics of PM_2.5 pollution  near-surface wind field  the transport pathways of air pollutants

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