摘要
为了弄清冬季局地环流对成都地区大气污染时空分布的影响,利用2018年1月成都市环境监测站逐时PM2.5浓度数据和ERA5再分析数据,分析2018年1月一次重污染过程中局地环流变化规律及其对PM2.5浓度分布的影响。结果表明:局地大气环流在污染区域性传输和扩散中起到了重要作用,尤其是污染开始和持续阶段主要受山谷风环流的显著影响;上午和傍晚时段的山谷风在成都西部区域发生转换并形成风场辐合,使局地大气污染加重,而中午至下午时段谷风及上升运动的增强使得大气污染自东向西有所缓解;冬季山谷风的输送和汇聚作用使大气污染物以日为周期不断循环和累积,对成都西部区域大气重污染的形成有着重要作用。
In order to understand the influence of winter local circulation on the spatial and temporal distribution of air pollution in Chengdu,hourly PM2.5 concentration data and ERA5 reanalysis data of Chengdu Environmental Monitoring Station in January 2018 were used to analyze the local circulation variation and its influence on PM2.5 concentration distribution during a heavy pollution process in January 2018.The results show that the local atmospheric circulation played an important role in the regional transmission and diffusion of pollution,especially in the beginning and maintenance stages of pollution,which was mainly affected by the valley wind circulation.The valley wind in the morning and evening changed in the western part of Chengdu and formed wind field convergence,which aggravated the local air pollution,while the enhancement of valley wind and ascending motion from noon to afternoon alleviated the air pollution from east to west.The transportation and convergence of the valley wind in winter made the atmospheric pollutants continuously circulate and accumulate in a daily cycle,which played an important role in the formation of heavy air pollution in the western region of Chengdu.
作者
鲁峻岑
张小玲
王安怡
韦荣
李朝阳
LU Juncen;ZHANG Xiaoling;WANG Anyi;WEI Rong;LI Zhaoyang(School of Atmospheric Sciences,Chengdu University of Information Technology/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225,China)
出处
《高原山地气象研究》
2023年第4期91-100,共10页
Plateau and Mountain Meteorology Research
基金
国家重点研发计划课题(2023YFC3709301)。
关键词
成都地区
局地环流
山谷风
Chengdu region
Local circulation
Valley wind