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成都气象要素等级对大气污染的改善作用研究
Study on Improving Effect Of Meteorological Conditions on Air Pollution in Chengdu
投稿时间:2022-05-05  修订日期:2023-05-22
DOI:10.19316/j.issn.1002-6002.2023.05.12
中文关键词:  成都  气象要素等级  大气污染  改善作用
英文关键词:Chengdu  meteorological element grade  air pollution  improving effect
基金项目:四川省教育厅高校人文社科重点研究基地"气象灾害预测预警与应急管理研究中心"2021年课题(ZHYJ21-ZD04);成都市气象局2021年度业务技术研究课题(2021-4)
作者单位
张颖 成都市温江区气象局, 四川 成都 611130 
高梦醒 成都市彭州市气象局, 四川 成都 611930 
陈林* 成都市温江区气象局, 四川 成都 611130 
刘智媛 成都市温江区气象局, 四川 成都 611130 
汪玲 成都市都江堰市气象局, 四川 成都 611830 
费永成 成都市温江区气象局, 四川 成都 611130 
通讯作者:陈林*  成都市温江区气象局, 四川 成都 611130  
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中文摘要:
      为找到对成都空气质量有改善作用的气象要素等级,量化成都气象条件对大气污染物的影响,对2015—2018年成都环境监测站空气质量监测数据和温江国家气候观象台同时段的气象观测资料进行了研究分析。结果表明: ①成都中部地区的空气质量污染较为严重,全年主要以PM2.5和O3污染为主,占比达75%,2015—2018年成都的PM2.5污染呈下降趋势,而O3污染虽有所波动但没有显著改善。 ②PM2.5持续重污染过程中,过去12 h降水量和过去24 h降水量均大于1 mm,均为有效降水,大于2.5 mm对PM2.5污染的改善作用显著增强;相对湿度低于70%对中度及以上PM2.5污染的改善作用同步增加,低于40%对轻度PM2.5污染的改善作用较为明显,优良天气的发生概率显著增加;风速大于1 m/s时PM2.5浓度随风速的增大而减小,大于2 m/s对PM2.5浓度的改善作用显著加强。 ③典型O3污染过程中,当总辐射低于1 MJ/m2、温度低于32℃、相对湿度高于50%、风速低于2 m/s时,O3污染将得到显著改善。
英文摘要:
      In order to find the meteorological elements grade that can improve the air quality and quantify the impact of meteorological conditions on air pollutants in Chengdu,the observation data from environmental monitoring sites and Wenjiang national meteorological site in Chengdu from 2015 to 2018 were analyzed.The results indicated that the air pollution in the central area of Chengdu was relatively serious,mainly caused by PM2.5 and O3 pollution,accounting for 75%.From 2015 to 2018,PM2.5 pollution in Chengdu showed a downward trend,while O3 pollution fluctuated but did not improve significantly.In the process of continuous heavy PM2.5 pollution,the precipitation in the past 12 hours and the precipitation in the past 24 hours were more than 1 mm,which were both effective precipitation,and the improvement effect of more than 2.5 mm on PM2.5 pollution was significantly enhanced.The improvement effect of relative humidity lower than 70% on moderate and above PM2.5 pollution increased synchronously,and the improvement effect of relative humidity lower than 40% on light PM2.5 pollution was more obvious,and the probability of fine weather increased significantly.When the wind speed was greater than 1 m/s,the PM2.5 concentration decreased with the increase of wind speed,and the improvement effect of PM2.5 concentration was significantly strengthened when the wind speed was greater than 2 m/s.There was an obvious scavenging effect on O3 while the sun radiation was lower than 1 MJ/m2,the atmospheric temperature was lower than 32℃,the relative humidity was higher than 50% and the wind speed lower than 2 m/s.
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