引用本文:杨杰.南通市一次典型沙尘污染过程分析[J].环境监控与预警,2020,12(6):16-21
YANG Jie.Analysis of a Typical Sand Dust Pollution Process in Nantong City[J].Environmental Monitoring and Forewarning,2020,12(6):16-21
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 526次   下载 254 本文二维码信息
码上扫一扫!
分享到: 微信 更多
南通市一次典型沙尘污染过程分析
杨杰
作者单位
杨杰 江苏省南通环境监测中心江苏南通 226006 
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,PM<sub>10</sub>小时峰值达311 μg/m<sup>3</sup>, ρ(Ca<sup>2+</sup>)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<sup>-</sup><sub>3</sub>的快速生成,浓度分别较污染前上升了96.6 %和34.0 %;ρ(NO<sup>-</sup><sub>3</sub>)/ρ(SO<sup>-2</sup><sub>4</sub>)污染中(2.5)高于污染前(1.7),ρ(EC)/ρ(PM<sub>2.5</sub>)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
Analysis of a Typical Sand Dust Pollution Process in Nantong City
YANG Jie
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 PM<sub>10</sub>was 311μg/m<sup>3</sup>, and the concentration of Ca<sup>2+</sup>was 7.4 times higher than before the contamination. Due to the alkaline dust particles,second component OM and NO<sup>-</sup><sub>3</sub> generated quickly, their concentrations increased by 96.6 % and 34.0 % respectively. The ratio of ρ(NO<sup>-</sup><sub>3</sub>)/ρ(SO<sup>-2</sup><sub>4</sub>) in pollution process (2.5) is higher than that before it (1.7). The ratio of ρ(EC)/ρ(PM<sub>2.5</sub>) 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