npj Climate and Atmospheric Science ( IF 8.5 ) Pub Date : 2024-07-04 , DOI: 10.1038/s41612-024-00667-5 Zekun Zhang , Bingqing Lu , Chao Liu , Xue Meng , Jiakui Jiang , Hartmut Herrmann , Jianmin Chen , Xiang Li
Recently, nitrate (NO3–) levels in winter pollution in eastern China have been increasing yearly and have become the main component of PM2.5. The factors contributing to this rise in surface NO3– concentrations remain unclear, complicating the development of targeted pollution control measures. This study utilizes observational data from Shanghai during the winter 2019, alongside box model simulations, to recreate the NO3− pollution event and identify the key factors in the growth process. The analysis demonstrated that a rise in winter ozone levels significantly promotes NO3– production by facilitating NOx conversion via gas-phase and heterogeneous reactions. These findings could explain the correlation between the synchronous increase of surface ozone and NO3− in recent years. Furthermore, simulation of control strategies for NOx and volatile organic compounds (VOCs) identified an approach centered on ozone reduction as notably effective in mitigating winter NO3– pollution in the Yangtze River Delta.
中文翻译:
地表臭氧增加导致冬季硝酸盐污染恶化
近年来,我国东部地区冬季污染中硝酸盐(NO 3 – )含量逐年上升,已成为PM 2.5 的主要成分。导致表面 NO 3 – 浓度上升的因素尚不清楚,这使得制定有针对性的污染控制措施变得复杂化。本研究利用 2019 年冬季上海的观测数据,结合箱模型模拟,重现 NO 3 − 污染事件,并确定增长过程中的关键因素。分析表明,冬季臭氧水平的上升通过气相和非均相反应促进 NO x 转化,从而显着促进 NO 3 – 的产生。这些发现可以解释近年来地表臭氧与NO 3 − 同步增加的相关性。此外,对 NO x 和挥发性有机化合物 (VOC) 控制策略的模拟发现,以减少臭氧为中心的方法对于减轻冬季 NO 3 – 非常有效。长三角地区污染。