Gan Cong, Li Baojie, Dong Jinyan, Li Yan, Zhao Yongqi, Wang Teng, Yang Yang, Liao Hong
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Environ Pollut. 2024 Feb 15;343:123228. doi: 10.1016/j.envpol.2023.123228. Epub 2023 Dec 24.
Nitrous acid (HONO) can be photolyzed to produce hydroxyl radicals (OH) in the atmosphere. OH plays a critical role in the formation of secondary pollutants like ozone (O) and secondary organic aerosols (SOA) via various oxidation reactions. Despite the abundance of recent HONO studies, research on national HONO emissions in China remains relatively limited. Therefore, this study employed a "wetting-drying" model and bottom-up approach to develop a high-resolution gridded inventory of HONO emissions for mainland China using multiple data. We used the Monte Carlo method to estimate the uncertainty in HONO emissions. In addition, the primary sources of HONO emissions were identified and their spatiotemporal distribution and main influencing factors were studied. The results indicated that the total HONO emissions in mainland China in 2016 were 0.77 Tg N (R: 0.28-1.42 Tg N), with soil (0.42 Tg N) and fertilization (0.26 Tg N) as the primary sources, jointly contributing to over 87% of the total. Notably, the North China Plain (NCP) had the highest HONO emission density (3.51 kg N/ha/yr). Seasonal HONO emissions followed the order: summer (0.38 kg N/ha) > spring (0.19 kg N/ha) > autumn (0.17 kg N/ha) > winter (0.06 kg N/ha). Moreover, HONO emissions were strongly correlated with fertilization, cropland, temperature, and precipitation. This study provides vital scientific groundwork for the atmospheric nitrogen cycle and the formation of secondary pollutants.
亚硝酸（HONO）在大气中可发生光解产生羟基自由基（OH）。OH通过各种氧化反应在臭氧（O）和二次有机气溶胶（SOA）等二次污染物的形成过程中发挥关键作用。尽管近期对HONO的研究众多，但中国国内有关HONO排放的研究仍相对有限。因此，本研究采用“干湿”模型和自下而上的方法，利用多种数据编制了中国大陆高分辨率网格化HONO排放清单。我们使用蒙特卡洛方法估算HONO排放的不确定性。此外，识别了HONO排放的主要来源，并研究了其时空分布及主要影响因素。结果表明，2016年中国大陆HONO排放总量为0.77 Tg N（范围：0.28 - 1.42 Tg N），其中土壤（0.42 Tg N）和施肥（0.26 Tg N）为主要来源，二者合计占排放总量的87%以上。值得注意的是，华北平原（NCP）的HONO排放密度最高（3.51 kg N/ha/yr）。HONO排放的季节顺序为：夏季（0.38 kg N/ha）＞春季（0.19 kg N/ha）＞秋季（0.17 kg N/ha）＞冬季（0.06 kg N/ha）。此外，HONO排放与施肥、耕地、温度和降水密切相关。本研究为大气氮循环和二次污染物的形成提供了重要的科学基础。
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