Characteristics and Causes of A Typical Particulate Matter Pollution Process in Autumn in Shanghai
Taking a typical particulate matter pollution process in October 2020 in Shanghai as the research object,a light UAV was used to conduct vertical observation of PM2.5 in Dongtan Chongming,Shanghai,the verti-cal distribution characteristics and causes of particulate matter during the pollution period were analyzed combi-ning the monitoring data from surrounding atmospheric superstations and multi-model simulation.The re-sults showed that at 11:00 on the 22nd,the concentration of PM2.5 decreased with the increase of height below 200 m,and increased with the increase of height between 200 m and 400 m,which was related to the weakening of the dilution of oceanic air masses at 400 m and the impact of pollution emission from the surroundings.Nitrate was the main contributor to particulate matter,accounting for 44.4％.The relative humidity at night was 95％.The increases of water content in particulate matter was highly positively correlated with the increase of nitrate(R=0.928),and water vapor promoted NO2 to enter the particulate state through heterogeneous reactions.Sec-ondary conversion sources,biomass and coal combustion played a decisive role in secondary particulate matter pollution.
万方数据
维普
