在东地中海城市大气中,轻氧化挥发性有机化合物度与大城市的度相美
Agnès Borbon1, Thérèse Salameh2, Stéphane Sauvage2
1Université Clermont Auvergne, Laboratoire de Météorologie Physique, OPGC/CNRS UMR 6016, Clermont-Ferrand, France.
Environmental pollution (Barking, Essex : 1987)
|March 31, 2024
概括
贝鲁特的氧化挥发性有机化合物 (OVOC) 与其他大城市一样高. 背景污染对OVOCs有很大的贡献,夏季有大量的二次生产,冬季有持续的二次生产.
科学领域:
- 大气化学 大气化学
- 空气污染 造成的空气污染
- 有机化合物 有机化合物
背景情况:
- 氧化挥发性有机化合物 (OVOC) 是具有复杂来源和大气化学成分的重要空气污染物.
- 了解VOC度和来源对于空气质量管理至关重要,特别是在快速发展的城市地区.
- 之前的研究集中在全球大城市的OVOC,但地中海东部地区的数据有限.
研究的目的:
- 用先进的测量技术量化黎巴嫩贝鲁特的OVOC初级和二级度.
- 调查OVOC的季节性变化和来源,包括背景污染和交通排放.
- 评估该地区OVOCs全球排放清单的准确性.
主要方法:
- 在ECOCEM活动期间,使用质子转移反应质谱法 (PTR-MS) 和AMOVOC采样器进行了OVOC的高分辨率测量.
- 通过两种不同的方法估计了初级和二级OVOC分量:夜间排放率和光化学年龄.
- 进行了相关性分析和与全球排放库存 (CAMS,Edgar,MACCITY) 的比较.
主要成果:
- 贝鲁特的OVOC度 (0.15-7.0ppb) 与全球主要城市的度相当.
- 背景污染对OVOC水平 (30%-80%) 有着显著的贡献,特别是对于长寿物种如甲醇和乙.
- 二次性OVOC产量在夏季高达60%并持续到冬季,而主要的交通排放占据了生物源的优势.
结论:
- 贝鲁特经历了高水平的OVOC污染,受当地排放和区域背景污染的影响.
- 在地中海东部,二次OVOC生产是一个全年重要的过程.
- 目前的全球排放清单显示,化物和类的排放量存在很大差异 (高达三次数),需要改进OVOC的表现.
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