|关键词: 冷空气路径 重污染天气 气象条件 江苏省
|The Influence of Southward Cold Anticyclone on the Process of Heavy Air Pollution in Jiangsu Province
CAO Lu，LIU Duan-yang，LU Wei-qing，YAN Wen-lian, CHEN Hao1,2
1 Jiangsu Meteorological Observatory，Nanjing,Jiangsu 210008，China;2.Jiangsu Provincial Environmental Monitoring Center,Nanjing,Jiangsu 210019, China
|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