【摘要】 应用湖北省武汉市2019年12月1日—2020年4月30日期间的大气颗粒物数据(PM10与PM2.5),以及MODIS气溶胶产品,获取该区域的气溶胶光学厚度(aerosol optical depth,AOD)、精细模式分数(fine-mode fraction,FMF)数据,建立4种气溶胶类型(城市/工业型、沙尘型、干洁海洋型和混合型)模型,对比分析新冠肺炎疫情影响下,社会管控及产业停产对武汉市大气颗粒物及气溶胶类型特性的影响。结果表明,管控及停产期间由于人为排放量减少,大气颗粒物浓度值均呈现下降趋势,除春节假期以外,城市/工业型气溶胶占比同样呈下降趋势,干洁海洋型气溶胶占比则上升至13.4%,而有序复工复产后,变化趋势则与管控停产期间相反。与2017—2019年同时期相比,春节后持续管控及停产期间,大气颗粒物浓度值和气溶胶参数同样低于往年同期。MODIS气溶胶产品能够有效获取区域气溶胶特性,对区域大气环境的监测及治理提供数据帮助。更多还原

【Abstract】 This study aims to compare and analyze the effects of social control and industrial shutdown induced by the COVID-19 epidemic on the particulate matter and aerosol types in Wuhan City,Hubei Province. To this end,the aerosol optical depth( AOD) and fine mode fraction( FMF) data of Wuhan City from December 1,2019 to April 30,2020 were obtained based on the data of atmospheric particulate matter( PM10 and PM2. 5) and the data from MODIS aerosol products. Then the models of four types of aerosols( urban/industrial,sand-dust,clean marine,and mixed types) were established,obtaining the following results. During the period of social control and industrial shutdown,the concentration of atmospheric particulate matter showed a downward trend owing to the reduction in anthropogenic emissions. Meanwhile, the proportion of urban/industrial aerosols also showed a downward trend,while the proportion of dry and clean marine aerosols increased to 13. 4% in the period except for the Spring Festival holiday. In contrast,the atmospheric particulate matter and the aerosols of the above types showed opposite trends after the ordered resumption of work and production. Compared with the same period during 2017—2019,the concentration of atmospheric particulate matter and aerosol parameters were also lower during the continuous control and shutdown after the Spring Festival. It can be inferred that MODIS aerosol products can be used to effectively obtain the characteristics of regional aerosols and thus provide data for the monitoring and governance of the regional atmospheric environment.更多还原