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在中国北方平原夜间表面臭氧增强的原因

Tianyi Hao¹, Bo Liu², Ziying Cai¹

¹Tianjin Environmental Meteorological Center, Tianjin 300074, China; CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research, Tianjin 300074, China; Tianjin Interdisciplinary Innovation Centre for Health and Meteorology, Tianjin 300074, China.

The Science of the total environment

|October 2, 2024

概括

夜间表面臭氧增强 (NSOE) 事件在北中国平原频繁发生,影响空气质量. 低水平喷气和垂直混合驱动这些事件,需要进一步研究夜间臭氧污染.

科学领域:

大气化学和物理大气化学和物理
空气污染研究研究
环境科学环境科学

背景情况:

北中国平原 (NCP) 经历了严重的臭氧污染,由人口密度,城市化和工业加剧.
现有的研究主要集中在白天的臭氧水平上,忽视了增加夜间臭氧度的关键问题.
夜间表面臭氧增强 (NSOE) 事件是该地区对空气质量了解不足的一个方面.

研究的目的:

调查NCP中夜间表面臭氧增强 (NSOE) 事件的特征和形成机制.
分析NSOE事件的频率,对白天臭氧的影响以及有助于NSOE事件的气象因素.
提供NSOE事件的全面概述,以告知未来的研究和政策.

主要方法:

分析了2015年至2023年NCP中204个国家大气成分监测站点的数据.
单个站点和区域NSOE事件的识别和描述.
研究气象因素,包括低水平喷气 (LLJ),垂直混合和天气系统,影响NSOE事件.

主要成果:

在2015年至2023年期间,NSOE事件每年发生在NCP的42%的单个地点和21%的区域区域.
NSOE事件与之前和之后的白天峰值臭氧度显著更高 (分别为84 ± 19 μg/m3和32 ± 15 μg/m3).
低水平喷气 (LLJ) 和垂直混合被确定为主要驱动因素,影响了57.6%-79.5%的NSOE事件,台风和冷战线等天气系统也发挥了作用.

结论:

NSOE事件显著影响了NCP的夜间臭氧水平和空气质量.
低水平喷气,垂直混合和特定的天气系统是NSOE形成的关键因素.
利用夜间垂直臭氧观测的进一步研究对于更深入地了解和有效地减轻NSOE至关重要.

关键词:

横向运输是一种水平运输.这是一架低级喷气式飞机.夜间的表面臭氧增强北中国平原的北方.垂直混合是一种垂直混合.

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