Surface exchange of HONO over paddy fields in the Pearl River Delta, China

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-10-01 DOI:10.1016/j.atmosenv.2024.120853

Baobin Han , Yingjie Zhang , Wenda Yang , Yihang Yu , Ke Tang , Yujie Tian , Yucheng Gong , Bingna Chen , Peng Cheng

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引用次数: 0

Abstract

Soil can release HONO, affecting atmospheric oxidation and tropospheric chemistry processes through the production of hydroxyl radicals (OH) and nitric oxide (NO) via photolysis. However, there is limited field observation of HONO flux, hindering a comprehensive understanding of its emission mechanisms. In this study, a dual open-top chambers system combined with a long path absorption photometer (LOPAP) was employed to measure HONO flux from paddy fields in the Pearl River Delta area (PRD), showing good reproducibility and effectivity to mitigate greenhouse effects. The average HONO flux was 0.77 ± 0.72 ng N m⁻² s⁻¹, displaying a diurnal pattern of higher fluxes during the day and lower fluxes at night, similar to previous flux observations. A strong linear correlation between the HONO flux with the product of NO₂ and solar radiation (R² = 0.90) suggests that surface reactions involving NO₂ and sunlight may dominate HONO production from the paddy fields, surpassing microbial activity within the soil. Given the diversity of field environments, more field observations are needed for assessing emission rates of HONO and understanding underlying mechanisms.

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中国珠江三角洲稻田上空的 HONO 表面交换

土壤会释放 HONO，通过光解产生羟基自由基（OH）和一氧化氮（NO），从而影响大气氧化和对流层化学过程。然而，对 HONO 通量的实地观测有限，妨碍了对其排放机制的全面了解。本研究采用了双开顶室系统结合长路径吸收光度计（LOPAP）来测量珠江三角洲（PRD）地区水稻田中的 HONO 通量，显示了良好的重现性和减缓温室效应的有效性。HONO 通量的平均值为 0.77 ± 0.72 ng N m-2 s-1，呈现出昼高夜低的昼夜变化规律，与之前的通量观测结果相似。HONO 通量与二氧化氮和太阳辐射的乘积（R2 = 0.90）之间存在很强的线性相关，这表明涉及二氧化氮和阳光的地表反应可能主导了水稻田中 HONO 的产生，超过了土壤中的微生物活动。鉴于田间环境的多样性，需要进行更多的实地观测，以评估 HONO 的排放率并了解其潜在机制。

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.