• 关键词：客观天气分型  T-mode主成分分析法（PCT）  臭氧污染  传输特征  潜在源区  银川

• 基金项目：宁夏自然科学基金（No.2021AAC03487）；国家自然科学基金（No.41765006）；宁夏回族自治区重点研发计划（No.2019BFG02025）

• 严晓瑜
• 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750000;宁夏气象防灾减灾重点实验室，银川 750000;宁夏气象服务中心，银川 750000

• 缑晓辉
• 宁夏气象服务中心，银川 750000

• 杨苑媛
• 银川市气象局，银川 750000

• 龚晓丽
• 宁夏气象服务中心，银川 750000

• 吴丽娟
• 宁夏气象服务中心，银川 750000

• 摘要：采用T-mode主成分分析法（PCT）对银川2016—2020年4—9月850 hPa位势高度和全风速场进行客观天气分型，并利用后向轨迹聚类方法、潜在源贡献算法（PSCF）和浓度权重轨迹分析法（CWT）探讨臭氧易污染天气型的传输特征和潜在污染源区.结果表明，最有利于形成臭氧污染的天气类型为东高西低型，其次是低空均压场高空弱西北气流型，再次是低空均压场高空强西北气流和辐合场型，对应的臭氧超标率分别为37%、34%、27%和27%；不利于促发臭氧污染的天气类型有暖高底部型、西北气流控制型和高压后部型.东高西低型下，银川臭氧的主要输送路径为东南气流，潜在源区为四川北部、陕西西南部、甘肃东北部和宁夏东部；偏东气流和西北气流对低空均压场高空弱西北气流型下 臭氧浓度均有重要影响，此天气型下银川臭氧潜在源区主要分布在内蒙古西南部与宁夏西北部接壤地区及宁夏北部和东部；低空均压场高空强西北气流型下臭氧主要输送路径为北方气流，潜在源区为内蒙古中西部及宁夏中东部；东南偏东气流为辐合型天气型下银川臭氧的重要 输送路径.

• Abstract：In this article， the obliquely rotated T-mode principal component analysis（PCT） method was applied to analysis the objective synoptic patterns of 850 hPa potential height and full wind speed field in Yinchuan in the April-September period from 2016 to 2020， and then， the transmission characteristics and the potential source regions of the ozone concentrations for ozone-prone weather patterns were analyzed by using the back trajectory cluster analysis method， potential source contributing factor analysis method（PSCF） and concentration weight trajectory analysis method（CWT）. The results showed that the pattern of higher in the west and lower in the east was the most conducive synoptic patterns to the formation of ozone pollution， followed by the pattern of the low-altitude uniform pressure field with high-altitude weak northwest airflow type， the last one was the low-altitude uniform pressure field with high-altitude strong northwest airflow type and convergence field， and the corresponding ozone excess rates were 37%， 34%， 27% and 27% respectively. The synoptic types that are unfavorable to promoting ozone pollution included warm-high-pressure bottom type， northwest-airflow control type and high pressure rear type. Under the east-higher and west-lower type， the main transport path of ozone in Yinchuan was the southeast airflow， and the potential source regions were northern Sichuan， southwestern Shaanxi， northeastern Gansu， and eastern Ningxia. The easterly airflow and northwestern airflow both had significant impacts on the ozone concentration under low-altitude uniform pressure field with high-altitude weak northwest airflow type， while the potential source region for this type was mainly distributed in the border region between southwest of Inner Mongolia and the northwest of Ningxia， and northern and eastern Ningxia. Northern airflow was the main transport path of ozone under low-altitude uniform pressure field with high-altitude strong northwest airflow type， and the potential source regions were the central and western part of Inner Mongolia and the central and eastern part of Ningxia. The southeast-to-easterly airflow was the main transport path of ozone under the convergent weather pattern.

• Key words：objective synoptic weather classification  principal component analysis in T-mode（PCT）  O₃ pollution  transmission characteristics  potential source  Yinchuan

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