摘要
荣昌是重庆大气污染最为严重的城市,分析该区域大气污染特征对荣昌及周边区域大气污染机理研究具有重要意义。利用数理统计、相关性分析等方法对荣昌大气污染特征及其气象条件进行了分析,结果表明:(1)荣昌首要污染物为PM_(2.5)(65.6%),主要出现在冬半年(11~2月),其污染状况呈逐年减弱趋势,其次为O3(30.8%),主要出现在夏半年(5~8月),其污染状况呈逐年增加趋势。(2)在水平风力为1级(0.3~1.5 m/s),降水量≤0.5 mm,日最高气温为10~15℃,相对湿度为70%~80%的条件下易发生PM_(2.5)污染事件。在水平风力为2级(1.6~3.3 m/s),降水量≤2.0 mm,日最高气温≥30℃,相对湿度为60%~70%条件下易发生O_(3)污染事件。研究显示荣昌空气质量状况逐年改善,污染类型由颗粒物污染逐渐向光化学污染转变,同时在特定气象条件下更易发生大气污染事件,研究为荣昌及周边区域大气污染防治提供了参考。
Rongchang is the city with the most serious air pollution in Chongqing.Analysis of the air pollution in this area is of great significance to the study of air pollution mechanisms in Rongchang and its surrounding areas.The characteristics of air pollution and meteorological conditions in Rongchang were analyzed by mathematical statistics,correlation analysis and other methods,the results show that:(1)PM_(2.5)(65.6%)was the primary pollutant,followed by O3(30.8%),PM_(2.5) mainly occurred from November to February of each year,and its mass concentration and number of days exceeding the standard are decreasing year by year.O_(3) mainly occurred from April to August each year.Its mass concentration and number of days exceedingthe standard are increasing year by year.(2)Meteorological conditions that were likely to cause heavy PM_(2.5)pollution are:horizontal wind level between 0.3~1.5 m/s,the daily precipitation≤0.5 mm,the daily maximum temperature between 10~15℃,and relative humidity between 70%~80%.Meteorological conditions that were likely to cause heavy O_(3) pollution are:horizontal wind level between 1.6~3.3 m/s,the daily precipitation≤2.0 mm,the daily maximum temperature≥30℃,and relative humidity between 60%~70%.Research has shown that the air quality in Rongchang has been improving year by year.The type of pollution has gradually changed from particulate pollution to photochemical pollution.At the same time,air pollution events were more likely to occur under certain meteorological conditions.The research provides a reference for air pollution prevention and control in Rongchang and its surrounding areas.
作者
张新科
李家川
谭霞
何跃
刘芮伽
ZHANG Xin-ke;LI Jia-chuan;TAN Xia;HE Yue;LIU Rui-jia(Rongchang Meteorological Service,Rongchang,Chongqing 402460,China;Chongqing Meteorological Observatory,Chongqing 4011472,China;Rongchang Ecology&Environment Bureau,Rongchang,Chongqing 402460,China)
出处
《四川环境》
2022年第5期71-77,共7页
Sichuan Environment
基金
2020年重庆市气象部门业务技术攻关项目(YWJSGG-202008)。
关键词
荣昌
大气污染
气象条件
Rongchang district
air pollution
meteorological conditions
