北京大学科研团队近日的研究揭示，可以根据大气氧化能力的长期趋势来制定臭氧污染减缓战略。2023年11月27日出版的《自然—地球科学》杂志发表了这项成果。
团队研究人员分析了 2006-2020 年期间8月份臭氧的观测数据及其预兆。分析结果显示，尽管主要大气氧化剂（羟基自由基，OH）持续增加，但臭氧在 2014 年之前一直增加，之后减少。这种臭氧趋势可以用 OH 周转率的变化来解释，OH 周转率主要由挥发性有机化合物与 NOx 之间的反应率决定。
总体而言，挥发性有机化合物的反应性减排，应该是近期臭氧污染控制的优先事项，其次是进一步控制氮氧化物的减排。
据研究人员介绍，对流层臭氧污染是影响空气质量的一个严重问题。然而，最有效的缓解办法尚不清楚，目前仍在争论是否应优先减少挥发性有机化合物或氮氧化物（NOx）。
附：英文原文
Title: Ozone pollution mitigation strategy informed by long-term trends of atmospheric oxidation capacity
Author: Wang, Wenjie, Li, Xin, Cheng, Yafang, Parrish, David D., Ni, Ruijing, Tan, Zhaofeng, Liu, Ying, Lu, Sihua, Wu, Yusheng, Chen, Shiyi, Lu, Keding, Hu, Min, Zeng, Limin, Shao, Min, Huang, Cheng, Tian, Xudong, Leung, K. M., Chen, Liangfu, Fan, Meng, Zhang, Qiang, Rohrer, Franz, Wahner, Andreas, Pschl, Ulrich, Su, Hang, Zhang, Yuanhang
Issue&Volume: 2023-11-27
Abstract: Tropospheric ozone pollution is a critical air-quality concern. However, the most effective mitigation approach remains unclear, with prioritizing the reduction of volatile organic compounds or nitrogen oxides (NOx) currently still under debate. Here we analyse observational measurements of ozone in August, as well as its precursors, between 2006 and 2020. We show that, despite a continuous increase in the primary atmospheric oxidant (hydroxyl radical, OH), ozone increased until 2014 and then decreased. This ozone trend can be explained by changes in OH turnover rate, primarily determined by the reactivity ratio between volatile organic compounds and NOx. Overall, reactive abatement of volatile organic compounds should be a near-future priority for ozone-pollution control, followed by further NOx controls.
DOI: 10.1038/s41561-023-01334-9
Source: https://www.nature.com/articles/s41561-023-01334-9