Elucidating key factors in regulating budgets of ozone and its precursors in atmospheric boundary layer

IF 8.5 1区地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES npj Climate and Atmospheric Science Pub Date : 2024-10-28 DOI:10.1038/s41612-024-00818-8

Xin Song, Xiao-Bing Li, Bin Yuan, Xianjun He, Yubin Chen, Sihang Wang, Yibo Huangfu, Yuwen Peng, Chunsheng Zhang, Aiming Liu, Honglong Yang, Chanfang Liu, Jin Li, Min Shao

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Abstract

The vertical variations and key drivers of ozone and its precursors, namely NOx and VOCs, in the atmospheric boundary layer, have vital impacts on surface ozone budgets but are poorly understood so far. Using online gradient measurements from a 356 m tower, we obtained continuous vertical profiles of ozone and its precursors, which exhibited strong gradients throughout the day. In the daytime, the vertical gradients of ozone precursors are significantly regulated by reactions with OH radicals. At night, our observations confirmed more intense VOC reactions with NO3 radicals in the residual layer than in the boundary layer. Additionally, we found that residual layer entrainment could contribute to over half of the boundary-layer ozone enhancements in the morning periods. Our results underscore the importance of considering vertical changes of ozone and its precursors in the atmospheric boundary layer when developing future ozone mitigation strategies.

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阐明调节大气边界层中臭氧及其前体预算的关键因素

臭氧及其前体物（即氮氧化物和挥发性有机化合物）在大气边界层中的垂直变化和主要驱动因素对地表臭氧预算有着至关重要的影响，但迄今为止人们对其了解甚少。利用 356 米高塔的在线梯度测量，我们获得了臭氧及其前体物的连续垂直剖面图，这些剖面图全天都呈现出强烈的梯度。在白天，臭氧前体物的垂直梯度在很大程度上受到与羟基自由基反应的调节。在夜间，我们的观测证实，与边界层相比，残留层中的挥发性有机化合物与 NO3 自由基的反应更为强烈。此外，我们还发现，残留层的夹带作用可能导致早晨边界层臭氧增强的一半以上。我们的研究结果突出表明，在制定未来的臭氧减缓战略时，必须考虑大气边界层中臭氧及其前体的垂直变化。

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来源期刊

npj Climate and Atmospheric Science Earth and Planetary Sciences-Atmospheric Science

CiteScore

8.80

自引率

3.30%

发文量

审稿时长

21 weeks

期刊介绍： npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols. The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.