关键词: 强沙尘天气, 大气环流, PM10质量浓度, 时空分布

Abstract:

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.

Key words: severe dust weather process, air circulation background, concentration of PM10, temporal and spatial distribution