A severe dust weather outbroken in Inner Mongolia on May 3-6,2017 and the value of AQI in each city of Inner Mongolia was up to 500.The dust weather process was analyzed based on meteorological observation data,MICAPS system and hybrid single particle lagrangian integrated trajectory (HYSPLIT) model.According to hourly monitoring data of PM10 and AQI data,the impact of dust weather on temporal and spatial distribution of PM10 concentration in Inner Mongolia was assessed.The results were as follows:the surface controlled by the strong clod high pressure and Mongolia cyclone,the cold front moving quickly from west to east,the strong upper cold air going down southward and moving eastward,which caused by the upper trough and low vortex moving eastward and development,the favorable stratified conditions and long distance transport of dust,these factors resulted in this strong dust weather.The temporal impact of the dust weather on concentration of PM10 was as follows:western and eastern cities,the whole region and eastern cities in Inner Mongolia were affected by the dust weather during the first,second and the last stages,respectively.The second stage was the period in which air pollution was expected to reach the'very high'or'severe'level.The whole Inner Mongolia region was divided in to four areas:the western,the centre,the eastern and Tongliao city.According to the spatial effect of the dust weather on concentration of PM10 by cluster analysis,the air pollution had some delay from west to east and from north to south,and the delay ranged from 1 to 10 hours.%2017年5月3-6日内蒙古出现了一次强沙尘天气,内蒙古各城市AQI值达到500.利用常规气象资料和MICAPS资料,结合HYSPLIT(hybrid single particle lagrangian integrated trajectory)模式分析本次沙尘天气成因.利用PM10小时监测值和AQI资料,从时空两方面评估沙尘天气对途经各城市PM10质量浓度分布的影响程度.结果表明:地面受冷高压和蒙古气旋影响,冷锋快速东移,高空槽和低涡东移发展,使高空强冷空气南下东移,配合有利的层结条件和外来沙尘的长距离输送,导致沙尘天气爆发;沙尘天气对PM10质量浓度的影响表现为前期主要影响西部和东部,中期对全区均有影响,后期主要对东部有影响.另外,中期为污染最严重时段.空间影响可划分为西部、中部、东部和通辽市4类,且从西到东、从北到南有一定的滞后性,滞后时间为1～10 h.
展开▼
