| 余灏,黄雪梅,易明建.宣城市一次短时细颗粒物污染成因分析[J].安徽建筑大学学报,2021,29(): |
| 宣城市一次短时细颗粒物污染成因分析 |
| Cause Analysis of a Short - term Fine Particle Pollution in Xuancheng City |
| 投稿时间：2021-04-20 修订日期：2021-09-15 |
| DOI：10.11921/j.issn.2095-8382.20210420002 |
| 中文关键词: 污染过程模拟 PM2.5 WRF-CAMQ |
| 英文关键词: pollutants simulation PM2.5 WRF-CAMQ |
| 基金项目:安徽建筑大学科研基金资助(2020QDZ31);国家重点研发计划(2018YFC0213806);安徽省重点研究与开发计划(1804a0802196) |
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| 中文摘要: |
| 2021年1月1-2日，宣城市出现特定时段细颗粒物（PM2.5）浓度突然升高、短时间内又快速下降的特殊污染现象。通过对比分析不同空间尺度范围内监测数据的关联变化，并利用空气质量模型模拟污染过程进行研究，结果表明：研究区域位于一个天气尺度的污染气团西南边界地带，随气团推移运行，该区域反复交替进入和偏离污染区，是PM2.5浓度出现快速升高和下降特征的主要原因；本次污染过程的特殊之处还表现为，开发区子站PM2.5峰值出现的时间符合2020年12月以来PM2.5日变化的一般规律，但是PM2.5浓度变化幅度差异显著，与PM2.5日变化的一般规律完全不同。因此，这是一次较为特殊的PM2.5污染过程，在PM2.5浓度背景值本来就高的时段，遭遇外部污染气团过境，是PM2.5浓度短时快速升高下降的原因。这说明了该区域细颗粒物污染成因具有多样性特点，也为科学制定相应的防治措施提供了有意义的理论依据。 |
| 英文摘要: |
| From January 1 to 2, 2021, the concentration of fine particulate matter (PM2.5) in Xuancheng City increased suddenly in a certain period of time and then decreased rapidly. By analyzing and comparing the correlation changes of monitoring data in different spatial scales, and using air quality model to simulate the pollution process, the results show that: the study area was located at the southwest boundary of a synoptic scale polluted air mass. As the air mass moved, this area repeatedly alternated to be in or out of the control of air pollution, is the main reason for the rapid rise and fall of PM2.5 concentration. What is special about this pollution process is that the peak occurrence time of PM2.5 in Kaifaqu substation was consistent with the general rule of daily variation of PM2.5 since December 2020, however, there was a significant difference in the variation amplitude of PM2.5 concentration, which was completely different from the general rule of PM2.5 diurnal variation. Therefore, this is a relatively special PM2.5 pollution process. During the period when the background value of PM2.5 concentration was already high, the transit of external polluted air mass led to the short-term rapid increase and decrease of PM2.5 concentration. The results illustrate that the causes of fine particulate pollution in this region are diversified and provide a meaningful theoretical basis for the scientific formulation of corresponding prevention measures. |
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