• 关键词：客观天气分型  臭氧污染  环流类型

• 基金项目：国家自然科学基金（No.41475040）；上海市科学技术委员会科研计划项目（No.16DZ1204607）；上海市气象局科技研发项目（No.MS201807）；上海市青年科技英才扬帆计划项目（No.18YF1421200）

• 常炉予
• 1. 长三角环境气象预报预警中心, 上海 200030;2. 复旦大学大气科学研究院, 上海 200433;3. 上海市气象与健康重点实验室, 上海 200030

• 许建明
• 1. 长三角环境气象预报预警中心, 上海 200030;2. 上海市气象与健康重点实验室, 上海 200030

• 瞿元昊
• 1. 长三角环境气象预报预警中心, 上海 200030;2. 上海市气象与健康重点实验室, 上海 200030

• 毛卓成
• 1. 长三角环境气象预报预警中心, 上海 200030;2. 上海市气象与健康重点实验室, 上海 200030

• 周广强
• 1. 长三角环境气象预报预警中心, 上海 200030;2. 上海市气象与健康重点实验室, 上海 200030

• 摘要：利用T-mode主成分分析法（PCT）对上海2013—2017年3—10月925 hPa低层位势高度和全风速场进行大样本客观分型，总结了有利于和不利于促发上海地面臭氧污染的大气环流类型. 发现有利于促发臭氧污染的环流形势都和副高有关，分别为副高控制（HC）和副高西北侧（HW），对应的臭氧超标率分别为68%和24.2%. 前者的气象特点表现为辐射最强、温度最高有利于臭氧的光化学生成，臭氧浓度较弱副高形势平均偏高约50%；而后者以西向风为主，呈现明显的输送效应. 相反不利于促发臭氧污染的环流类型都和低值系统相关，分别为低压北侧（LN）、低压东侧（LE）和低压西侧（LW），臭氧超标率均低于7%. 其中LN影响下上海水平风速最大、扩散条件最好，不利于臭氧积聚；LE和LW影响下上海多云雨天气导致辐射降低，抑制了臭氧的光化学生成.

• Abstract：In this article, the obliquely rotated T-mode principal component analysis (PCT) method was applied for synoptic classification related to surface ozone pollution in Shanghai based on NCEP reanalysis data (i.e. geopotential height and u、v wind) from 2013 to 2017. The results showed that the ozone pollution occurrence in Shanghai was mostly related to subtropical high, described as two typical patterns of subtropical high control (HC) and north-west to high (HW), with the ozone non-attainment ratio of 68% and 24.2% respectively. The strongest radiation and the highest temperature were both revealed under HC controls compared to that under other circulation patterns, indicating the meteorology of HC was most favorable for ozone photochemical production. The ozone concentration under HC simulated by WRF-CHEM model was 50% higher than that under weak subtropical high due to different meteorological conditions. The meteorology of HW was characterized as relative lower radiation but much more west winds, which was illustrated to be very conductive to the transportation of ozone and its precursors from upstream area. On the other hand, low ozone situations were mostly occurred with the relation to low pressure systems, named as three patterns of north to low (LN), east to low (LE) and west to low (LW) with the ratio of ozone non-attainment less than 7%. Under LN, the wind speed was highest leading to the strongest capacity for ozone dispersion. While under the LE and LW, more precipitations and clouds were observed to reduce solar radiation dramatically, thus inhibiting the ozone photochemical production.

• Key words：objective synoptic weather classification  O₃ pollution  synoptic situation

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