南京夏季大气污染物日变化特征分析(与WRF模拟值对比)——以2018-07.20~28为例

Analysis of Diurnal Variation Characteristics of Air Pollutants in Nanjing in Summer (Comparison with WRF Analog)—Taking 2018-07-10~20 as an Example

摘要: 对流层臭氧(O₃)主要由氮氧化物(NO)和挥发性有机物(VOCs)经过一系列光化学反应生成，经2018年7月20~28日的南京市大气污染状况的评估，我们发现，采用WRF模型，可以准确地反映出南京夏季的污染物的时空变化趋势，并且可以预计其中的某些成因会影响到南京市的环境质量。研究显示，1) 在过去的6年中，南京市的3种主要的大气污染物(CO、NO₂、SO₂)的年平均质量浓度依次是800、43.1、13.0 (μg·m⁻³)。南京的臭氧水平比中国其他地区(北京、上海、广州、成都、兰州、武汉)都要高。2) 在2018年，南京市的NO₂、SO₂和CO的超标情况有所改善，其中，NO₂、SO₂的平均下降幅度分别是29.1%、38.1%、28.1%。2018年南京夏季的空气质量整体上较为良好，尽管冬季仍有三种污染物的存在，但夏季的空气质量却没有出现明显的变化，而这种情况得益于当地的经济发展和多样化的工业结构。

Abstract: Tropospheric ozone (O₃) is mainly generated by nitrogen oxides (NO) and volatile organic compounds (VOCs) through a series of photochemical reactions. After assessing the air pollution status in Nanjing on July 20~28, 2018, we found that the spatiotemporal variation trend of pollutants in Nanjing in summer can be accurately reflected by using WRF model. And it can be expected that some of these causes will affect the environmental quality of Nanjing. The results showed that, 1) In the past six years, the average annual mass concentration of three major atmospheric pollutants (CO, NO₂, SO₂) in Nanjing was 800, 43.1, 13.0 μg·m⁻³, respectively. The ozone level in Nanjing is higher than that in other parts of China (Beijing, Shanghai, Guangzhou, Chengdu, Lanzhou, Wuhan). 2) In 2018, the exceedability of NO₂, SO₂ and CO in Nanjing was improved, among which the average decrease rate of NO₂ and SO₂ was 29.1%, 38.1% and 28.1%, respectively. In 2018, the air quality in Nanjing in summer was generally good, although there were still three kinds of pollutants in winter, there was no significant change in the air quality in summer, which benefited from the local economic development and diversified industrial structure.