【摘要】 根据太原市13个自动监测站资料、雷达监测资料和美国国家海洋和大气管理局(NOAA)的NCEP/NCAR再分析资料,从天气形势、水汽条件、热力层结、垂直运动和温度平流等几个方面对2017年11月25日至28日太原市的一次重污染过程进行了分析。结果表明,稳定的环流形势,较低的风速是维持霾天气的重要因素;相对湿度的近地层直减率越高,近地层空气越潮湿越容易导致霾的发生;垂直上升运动减弱会抑制颗粒物向上扩散;温度平流较小、逆温层和均温层均利于近地面污染物的积累。后向轨迹模拟显示,此次霾过程,除了太原市本地的污染源导致的污染物浓度上升外,区域冬季供暖产生的污染物的长距离输送也是本次太原市霾天气形成的原因之一。更多还原

【Abstract】 According to the data of 13 automatic monitoring station of taiyuan,radar monitoring data and the national oceanic and atmospheric administration(NOAA)of the NCEP/NCAR reanalysis data,from the weather situation,water vapor condition,thermal stratification,vertical movement and temperature advection from 25 to 28 November 2017,a heavy pollution process in Taiyuan are analyzed.The results show that stable circulation situation and low wind speed are important factors to maintain haze weather.The higher the direct decrease rate of relative humidity in the near stratum,the more humid the air in the near stratum,the easier it is to cause haze.The decrease of vertical upward movement will inhibit the upward diffusion of particulate matter.The temperature advection is small,the inversion layer and the uniform temperature layer are beneficial to the accumulation of pollutants near the ground.The backward trajectory simulation shows that in this haze process,in addition to the increase of pollutant concentration caused by local pollution sources in Taiyuan,the long distance transportation of pollutants generated by regional heating in winter is also one of the reasons for the formation of haze weather in Taiyuan.更多还原