%0 Journal Article %T 南通市一次典型沙尘污染过程分析 %T Analysis of a Typical Sand Dust Pollution Process in Nantong City %A 杨杰 %A YANG,Jie %J 环境监控与预警 %@ 1674-6732 %V 12 %N 6 %D 2020 %P 16-21 %K 沙尘污染;颗粒物化学组分;气象因素;南通市 %K Sand dust pollution;Particles chemical composition;Climatic factor;Nantong city %X 根据南通市大气超级站的观测结果和气象因素,对南通市2019年10月29日—11月2日一次典型沙尘污染过程、颗粒物化学组分、颗粒物消光和退偏进行分析。结果表明,在沙尘影响期间,PM10小时峰值达311 μg/m3, ρ(Ca2+)较污染前上升了7.4倍;在沙尘颗粒物碱性环境条件下,二次组分OM和NO-3的快速生成,浓度分别较污染前上升了96.6 %和34.0 %;ρ(NO-3)/ρ(SO-24)污染中(2.5)高于污染前(1.7),ρ(EC)/ρ(PM2.5)污染中(4.2%)高于污染前(3.6%),受到明显的沙尘传输影响,而移动源排放也有一定贡献,在本地地面气压场较弱情况下,导致沙尘污染过程长时间持续。 %X According to the observation results of the Nantong atmosphere super station and the climatic factor, a typical dust pollution process, chemical composition of particulate matter, extinction and depolarization of particulate matter in Nantong city from 29 October to 2 November 2019 were analyzed. The results showed that, during the dust pollution process, the peak concentration of PM10was 311μg/m3, and the concentration of Ca2+was 7.4 times higher than before the contamination. Due to the alkaline dust particles,second component OM and NO-3 generated quickly, their concentrations increased by 96.6 % and 34.0 % respectively. The ratio of ρ(NO-3)/ρ(SO-24) in pollution process (2.5) is higher than that before it (1.7). The ratio of ρ(EC)/ρ(PM2.5) in pollution process (4.2%) was higher than that before it (3.6%) as well. It indicated that in addition to the obvious impact of dust transport, mobile source emissions also made a certain contribution to that pollution process, so that the dust pollution process lasted for a long time on the condition of weak local surface pressure field. %R %U http://www.hjjkyyj.com/hjjkyyj/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0