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平流层对中国表面臭氧污染的影响

Zhixiong Chen^1,2, Jane Liu^3,4, Xiushu Qie⁵

¹Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, China.

Nature communications

|May 14, 2024

概括

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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:

对地表的平流层侵入 (SITS) 是已知的严重地表臭氧 (O3) 污染的已知原因之一.
量化SITS对O3表面的长期影响是具有挑战性的,因为测量SITS频率,持续时间和强度是困难的.

研究的目的:

评估SITS事件对2015年至2022年中国表面臭氧污染的影响.
分析SITS事件的频率,持续时间和强度以及它们对表面臭氧水平的贡献.

主要方法:

从2015年到2022年,通过密集表面测量O3和一氧化碳,在中国识别了27616起SITS事件.
分析SITS指标 (频率,持续时间,强度) 和它们与表面O3度的相关性.

主要成果:

在高海拔地区,SITS事件更频繁,但在平原地区更强烈.
在这些事件中,SITS平均增加了20ppbv的表面O3,在这些事件中为O3贡献了30-45%.
在春季和秋季,SITS诱导的O3达到顶峰,超过70%的温暖月份的SITS加剧了污染;从2015年到2022年,观察到SITS诱导的O3的下降趋势.

结论:

SITS对中国各地的地表臭氧水平产生重大影响,其区域和季节性模式各不相同.
观察到的SITS诱导的臭氧趋势对制定有效的O3减排策略有影响.
精确测量SITS指标对于了解和管理臭氧污染至关重要.

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