| 新冠肺炎疫情期间气象条件和排放变化对PM2.5的影响 |
| 摘要点击 3298 全文点击 841 投稿时间：2020-11-02 修订日期：2021-01-14 |
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| 中文关键词 新冠肺炎疫情期间 WRF-CMAQ模型 PM2.5 气象定量影响 排放定量影响 |
| 英文关键词 COVID-19 epidemic WRF-CMAQ model PM2.5 meteorological condition pollutant emission |
| 作者 | 单位 | E-mail | | 逯世泽 | 清华大学环境学院, 北京 100084 | lusz19@mails.tsinghua.edu.cn | | 史旭荣 | 生态环境部环境规划院, 空气质量模拟与系统分析中心, 北京 100012 | | | 薛文博 | 生态环境部环境规划院, 空气质量模拟与系统分析中心, 北京 100012
生态环境部环境规划院, 国家环境保护环境规划与政策模拟重点实验室, 北京 100012 | xuewb@caep.org.cn | | 雷宇 | 生态环境部环境规划院, 空气质量模拟与系统分析中心, 北京 100012 | | | 严刚 | 生态环境部环境规划院, 空气质量模拟与系统分析中心, 北京 100012 | |
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| 中文摘要 |
| 本文基于WRF-CMAQ定量分析了2020年1~3月全国337城市气象条件和排放变化对PM2.5浓度的影响.全国气象条件整体转好1.7%，1月转差1.6%，2~3月分别偏有利1.3%和7.9%；全国污染物排放下降使得PM2.5浓度同比下降14.1%，1~3月分别下降4.0%、25.7%和15.0%.武汉第一季度实测PM2.5浓度同比降幅高于全国水平，与其气象条件大幅转好且污染排放降幅较大有关.北京在疫情发生前和严控期PM2.5浓度同比升高，主要为气象转差所致；复工复产期同比下降，主要为污染排放大幅下降所致."2+26"城市、汾渭平原和长三角在第一季度PM2.5浓度同比均下降，长三角降幅最大，与其污染排放大幅下降有关；"2+26"城市和汾渭平原在疫情发生前气象条件大幅转差，严控期大幅转好，长三角在复工复产期气象条件最有利；重点区域均为疫情严控期污染排放降幅最高，复工复产期降幅趋缓. |
| 英文摘要 |
| This study analyzed the impacts of meteorological conditions and changes in air pollutant emissions on PM2.5 across the country during the first quarter of 2020 based on the WRF-CMAQ model. Results showed that the variations in meteorological conditions led to a national PM2.5 concentration decreased of 1.7% from 2020-01 to 2020-03, whereas it increased by 1.6% in January and decreased by 1.3% and 7.9% in February and March, respectively. The reduction of pollutants emissions led to a decrease of 14.1% in national PM2.5 concentration during the first quarter of 2020 and a decrease of 4.0%, 25.7%, and 15.0% in January, February, and March, respectively. Compared to the same period last year, the PM2.5 concentration measured in Wuhan City decreased more than in the entire country. This was caused by improved meteorological conditions and a higher reduction of pollutant emissions in Wuhan City. PM2.5 in Beijing increased annually before the epidemic outbreak and during the strict control period, mainly due to unfavorable meteorological conditions. However, the decrease in PM2.5 in Beijing compared to March 2019 was closely related to the substantial reduction of emissions. The measured PM2.5 in the "2+26" cities, the Fenwei Plain and the Yangtze River Delta (YRD) decreased during the first quarter of 2020, with the largest drop occurring in the Yangtze River Delta due to higher YRD emissions reductions. The meteorological conditions of "2+26" cities and Fenwei Plain were unfavorable before the epidemic outbreak and greatly improved during the strict control period, whereas the Yangtze River Delta had the most favorable meteorological conditions in March. The decrease in PM2.5 concentration caused by the reduction of pollutant emissions in the three key areas was highest during the strict control period. |
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