| 摘要: |
| 根据2013—2015年江苏省重污染（重度污染和严重污染）个例，分析冷空气南下对重污染天气过程的影响机制和特征。将冷空气南下过程按路径分为东路、中路和西路，分别统计了不同路径冷空气影响江苏的特征，以及冷空气背景下重污染发生时的气象条件，总结了不同路径冷空气对污染物浓度日增幅的影响，探讨了冷空气对江苏省大气污染的影响机制。研究表明，江苏省的重污染天气主要发生在中路冷空气影响时，东路冷空气影响概率相对较小；中路、西路易出现区域性、连续性重污染；东路多单站点污染，连续污染概率较小。重污染日的高空冷空气主体偏北，中低层为槽后脊前西北气流或有弱切变，地面处于冷高压前部；中路、西路冷空气对污染的输送贡献大于东路，对上游污染呈负输送，如有强逆温、小风速的“静稳”天气，重污染仍可能加剧；重污染天气的发生，是本地污染、外源输送和局地不利污染扩散的气象条件共同作用造成的。 |
| 关键词: 冷空气路径 重污染天气 气象条件 江苏省 |
| DOI： |
| 分类号:X823 |
| 文献标识码:B |
| 基金项目:国家自然科学基金资助项目（41575010）；国家重点研发计划基金资助项目（2016YFC0201901）；中国气象局预报员专项基金资助项目（CMAYBY2017-027）；江苏省“333高层次人才培养工程”基金资助项目（BRA2016565）；江苏省环境监测科研基金资助项目（1902）；江苏省气象局青年基金资助项目（KQ202003） |
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| The Influence of Southward Cold Anticyclone on the Process of Heavy Air Pollution in Jiangsu Province |
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CAO Lu，LIU Duan-yang，LU Wei-qing，YAN Wen-lian, CHEN Hao1,2
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1 Jiangsu Meteorological Observatory，Nanjing,Jiangsu 210008，China;2.Jiangsu Provincial Environmental Monitoring Center,Nanjing,Jiangsu 210019, China
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| Abstract: |
| That the mechanisms and characteristics of the influence of southward cold anticyclone on severe air pollution episode was analyzed based on severe air pollution cases in Jiangsu Province during 2013—2015. The process of the cold air was divided into easterly, central and westerly pathway. The characteristics of impact of cold air from each pathway on Jiangsu Province in different paths were analyzed as well as the meteorological conditions of heavy pollution in cold air.The effects of cold air in different paths on the daily increase of pollutant concentration were summarized. The influence mechanism of cold air on air pollution in Jiangsu Province was discussed. The results showed that in Jiangsu Province, severe air pollution happened under cold air was mostly took place when the cold air was from central pathway, and rare cases were from easterly pathway. Generally, the air pollution episodes under central and western pathway were regional and continuous; while those under eastern pathway were local and short. During severe pollution episodes, at high altitude, the cold air was mainly at north side of Jiangsu Province; at mid and low altitude, there was northwest airflow in front of ridge or weak shear; on the surface, Jiangsu was in the front of cold air. Compared to the easterly pathways, more air pollutants were transported from central or westerly pathway. The heavy pollution might be intensified under stable weather conditions with negative transportation upstream, extraordinarily strong inverse and weak wind.Overall, the severe air pollution in Jiangsu province was attributed to the combined contributions from local emission, regional transportation and unfavorable weather conditions. |
| Key words: Pathway of cold air Heavy air pollution Meteorological conditions Jiangsu Province |
