A comparative study on the influence of the reflux effect on the two dust weather in the Jianghuai region
This paper takes two sandstorms on March 16 and 28,2021 as examples,by using conventional ground meteorological observation data and meteorological reanalysis data,combined with aerosol lidar,wind profile radar,HYSPLIT model,etc.,the weather system,particle concentration,aerosol optical characteristics,and boundary layer meteorological conditions that affect the occurrence of the two sandstorms in the Jianghuai region were analyzed.In particular,the influence of reflux was explored.Results indicate that both times were dust prone weather,which is related to the activity of newly formed Mongolian cyclones in warm regions.The impact on the Jianghuai region can be divided into the influence of pollutants in the rear of the cold front and pollutants in the back of the high pressure.The former is prone to single-peak rapid growth of pollutants within 2-4 hours,while the latter corresponds to multi-peak continuous growth of pollutants within 7-9 hours,eventually leading to severe pollution levels exceeding 1 000 μg·m-3.The pollutants originate from Mongolia and Baikal,and after passing through North China,the transport height decreases to below 1 km,with even lower transport heights of 0.3-0.6 km during the reflux flow phase.An increase in the wind speed at the transport level to 8-14 m·s-1 is beneficial for the long-term dispersion of pollutants at the ground level.
dustexplosive growth of PM10Mongolian cyclonerefluxJianghuai region
国家科技期刊平台
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