中国东南部沿海城市聚合区的光化学:污染机制和控制影响
Gaojie Chen1, Qiao Shi2, Lingling Xu1
1Fujian Key Laboratory of Atmospheric Ozone Pollution Prevention, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
The Science of the total environment
|August 16, 2023
概括
在中国沿海城市,地面层臭氧污染正在恶化. 南部较高的臭氧前体度导致更严重的污染,主要是由挥发性有机化合物 (VOC) 造成的.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 空气质量研究 空气质量研究
背景情况:
- 在中国,地面层臭氧 (O3) 度正在迅速增加,影响空气质量和气候.
- 沿海城市聚集区面临严重的O3污染,但研究仍然有限.
- 在这些地区了解现场光化学对于有效的缓解至关重要.
研究的目的:
- 调查中国东南部沿海城市聚合区中O3污染的特征和形成.
- 确定主要的O3前体及其来源.
- 评估挥发性有机化合物 (VOC) 和氧化 (NOx) 在O3形成中的作用.
主要方法:
- 2019年秋季在六个地点对O3及其前体进行了全面的现场观测.
- 利用模型模拟来分析O3形成率和控制因素.
- 分析了VOC物种和来源,包括工业排放,溶剂使用和车辆废气.
主要成果:
- 在城市聚合区的南部,由于前体含量较高和大气氧化能力更强,O3污染更严重.
- 氧化挥发性有机化合物 (OVOC),NO2和CO主导了OH的总反应性.
- 挥发性有机物是O3生产的主要驱动因素,特别是芳和,车辆排气在大多数地区都是主要来源.
结论:
- 在大多数研究地区,O3形成主要由VOC控制,在泉州由VOC和NOx共同限制.
- 减少VOC排放对于减轻沿海城市地区的光化学污染至关重要.
- 该研究提供了对城市级光化学污染动态和前体控制策略的见解.
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