2017年太原冬季一次重污染天气的过程分析

Analysis on a Heavy Polluted Weather Process in Winter in Taiyuan in 2017

2017年12月14—15日太原市出现了一次重污染天气,结合污染物浓度、气象因素、雷达监测及SPAMS在线源解析系统,综合分析了此次重污染天气形成机制及可能的来源。结果表明:此次重污染是一次区域输送和不利气象条件共同影响而导致的污染过程,重污染持续时间为2天,均达到重度污染水平;在重污染过程中颗粒物质量浓度上升较为明显,PM_(10)与PM_(2.5)日均值分别为250μg/m^3和200μg/m^3,是非污染期的2.3倍和4.1倍;重污染期与非污染期相比机动车尾气、二次无机源及燃煤源浓度占比分别上升了5.05%、3.99%和2.69%。

A heavy pollution weather occurred in Taiyuan from 14 to 15 December 2017,combined with pollutant concentration,meteorological factors,radar monitoring and SPAMS online source analysis system,this paper comprehensively analyzes the formation mechanism and possible sources of the heavy pollution weather. The results show that the heavy pollution is a pollution process caused by a regional transport and adverse weather conditions,the duration of heavy pollution is 2 days,reaching a severe level;the mass concentration of particulate matter increased obviously during heavy pollution,the daily mean values of PM_（10） and PM_（2.5） are 250 μg/m3 and 200 μg/m3,which are 2.3 times and 4.1 times that of the non pollution period;compared with the non pollution period,the vehicle exhaust,the two inorganic source and the coal source concentration of the heavy pollution period increased by 5.05%,3.99% and 2.69%.