| 摘要: |
| 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。 |
| 关键词: 沙尘污染 颗粒物化学组分 气象因素 南通市 |
| DOI： |
| 分类号:X513 |
| 文献标识码:B |
| 基金项目:江苏省PM2.5和臭氧污染协同控制重大专项（PM2.5、臭氧及其前体物监测体系、质控质保体系研究及示范应用）基金资助项目 |
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| Analysis of a Typical Sand Dust Pollution Process in Nantong City |
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YANG Jie
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Jiangsu Nantong Environmental Monitoring Center，Nantong，Jiangsu 226006，China
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| Abstract: |
| 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 PM10was 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. |
| Key words: Sand dust pollution Particles chemical composition Climatic factor Nantong city |
