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长株潭区域一次重度污染过程气象成因
Meteorological Cause of a Heavy Pollution Process in Changsha-Zhuzhou-Xiangtan Region
投稿时间:2022-04-06  修订日期:2022-09-07
DOI:10.19316/j.issn.1002-6002.2023.05.19
中文关键词:  长株潭区域  细颗粒物  环流特征  后向轨迹  气象成因
英文关键词:Changsha-Zhuzhou-Xiangtan region  fine particulate matter  circulation characteristics  backward trajectory  meteorological causes
基金项目:
作者单位
曾欣 株洲市气象局, 湖南 株洲 412000 
舒磊 株洲市气象局, 湖南 株洲 412000 
张靖 株洲市气象局, 湖南 株洲 412000 
谢倩雯 株洲市气象局, 湖南 株洲 412000 
曾珊珊 株洲市生态环境局, 湖南 株洲 412000 
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中文摘要:
      利用PM2.5质量浓度、地面气象要素、NCEP、ERSST_V3、GBL等资料,研究了2021年12月7—11日长株潭地区一次重度空气污染过程的特征及成因。结果表明,高空平直环流、无明显槽脊影响,地面弱冷空气活跃是本次重度空气污染过程的主要环流形势特征;地面均压场、小风和升温增湿是此次重度空气污染过程的主要气象要素特征。污染物浓度变化与主导风向和污染通道密切相关,本地风速对混合层的高度、污染物水平扩散影响较大,600~700 hPa逆温层有利于污染物在主导风作用下近距离传输及在低层交换积累。我国中东部污染物积聚是长株潭区域重要的污染来源,长株潭地区存在区域性同步污染现象。低层流入长株潭区域气流轨迹差异及地理条件是长株潭污染物空间分布差异的重要因素。
英文摘要:
      Using AQI and PM2.5 mass concentration,ground meteorological elements,NCEP,ERSST_V3,GBL and other data,the characteristics and causes of a severe air pollution process in Changsha-Zhuzhou-Xiangtan region from December 7 to December 11,2021 were studied.The results showed that the main circulation characteristics of this heavy air pollution process were flat upper air circulation,no obvious trough ridge influence,and weak cold air activity on the ground.Average surface pressure field,small wind,heating and humidification were the main meteorological features of this heavy air pollution process.The variation of pollutant concentration was closely related to the dominant wind direction and pollution channel.The local wind speed had a great influence on the height of mixing layer and pollutant level diffusion.The 600-700 hPa inversion layer was favorable for the short-distance transport and exchange accumulation of pollutants in the low layer under the action of dominant wind.Pollutant accumulation in central and eastern China was an important pollution source in Changsha-Zhuzhou-Xiangtan region,there was regional synchronous pollution phenomenon in Changsha-Zhuzhou-Xiangtan region.The difference of air flow track and geographical conditions in the Changzhu-Zhuzhou-Xiangtan region were important factors for the spatial distribution difference of pollutants in Changzhu-Zhuzhou-Xiangtan region.
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