丹东市大气颗粒物质量浓度变化特征及其与能见度的关系

Mass Concentration Variation of Atmospheric Particles and Relationship with Visibility in Dandong

利用2008年丹东沙尘暴监测站的ρ(PM10),ρ(PM2.5)和ρ(PM1)监测资料,探讨了丹东市大气颗粒物质量浓度的变化特征及其与能见度的关系.结果表明:由外来源经中长距离输送引发的沙尘中携带了大量的粗颗粒物,而细颗粒物所占比例相对较少;可吸入颗粒物质量浓度具有明显的季节变化特征,冬季最高,夏季最低,春季、秋季居中;丹东粗颗粒物质量浓度较低,但粗颗粒物中细颗粒物所占比例却非常高;颗粒物的粒径越小,其对能见度的影响就越大.

Observation data of PM10,PM2.5 and PM1 mass concentrations from Dandong dust storm Observation Station in 2008 are utilized to study the mass concentration variation of particles and the relationship with visibility in Dandong.The results show that the number of coarse particles is much larger than fine particles in dust events caused by long distance transport.The mass concentration of inhaled particles has an obvious seasonal pattern;it becomes the highest in winter and the lowest in summer.The percentage of PM2.5 and PM1 in PM10 are very high,although mass concentration of PM10 in Dandong is very low.In addition,the finer the particles are,the more they affect visibility.