【摘要】 使用2010²013年气溶胶颗粒物质量浓度资料和相关气象资料,分析了风和降水对颗粒物的清除作用,结果表明:降水对气溶胶颗粒物的清除效果随雨强、降水持续时间及降水总量增加而增加。同等雨量条件下,降水对PM_Course的清除效果要好于对PM_2.5的清除效果。降水对气溶胶颗粒物的清除效果与降水前气溶胶颗粒物浓度关系密切,降水开始前气溶胶颗粒物浓度较低时,降水对其清除效果不佳,降水开始前气溶胶颗粒物浓度较高时,降水对其有明显的清除作用。降水前后的气溶胶颗粒物浓度有明显的正相关,气溶胶颗粒物浓度较高时,需要连续多次降水过程才会使其浓度下降到较低的水平。气溶胶颗粒物浓度在较低水平时,雨强增大不会使其浓度继续降低;强降水发生后,雨强减小会使气溶胶颗粒物浓度升高。气溶胶颗粒物大颗粒(PM_Course)总体为碱性,小颗粒(PM_2.5)总体为酸性。降水的pH值和电导率都和降水间隔和风速成正相关,和降水量成反相关。气溶胶颗粒物浓度随水平风速增长呈现出先减后增的趋势。对PM_2.5来说,当水平风速在7m/s以下时,其浓度随水平风速增大而减小,当水平风速大于7m/s时,其浓度随水平风速增大而增大。PMC ourse变化趋势与PM_2.5类似,其转折点的水平风速为4m/s。更多还原

【Abstract】 Scavenging effect of precipitation and wind on particles was studied,using aerosol particle concentration data and relevant meteorological data from 2010 to 2013 in Wuxi area.The result shows that scavenging effect of precipitation increases with rainfall rate,Rainfall duration and precipitation.Under the same conditions,scavenging effect of precipitation on PMC ourseis better than that of PM_2.5.Scavenging effect of precipitation on aerosol particles and aerosol particle concentration before precipitation are closely related.Lower aerosol particle concentration before precipitation leads to poorer scavenging effect and higher aerosol particle concentration before precipitation leads to better scavenging effect.There was a positive correlation of aerosol particles concentration before and after precipitation.When the aerosol particle concentration is high,it requires continuous precipitation to make the concentrations down to a low level.When the aerosol particle concentration is low,increases of rainfall rate does not result in lower aerosol particle concentration.After strong precipitation,intensity of rainfall leads to increases of aerosol particle concentration.Large particles（PMC ourse）in general are alkaline while small particles(PM_2.5)in general are acid.The pH value and the conductivity of precipitation increase positively with interval of precipitation and wind speed but negatively with precipitation.The aerosol particle concentration first to decrease and then increase with the increase of wind speed.For PM_2.5,its concentration decreases with wind speed when the wind speed is less than 7m/s,and increases with wind speed when the wind speed is higher than 7m/s.The changing trend of PMC ourseis similar to that of PM_2.5,the wind speed at the turning point is 4m/s.更多还原