Variations of chloride depletion and its impacts on ozone formation: Case study of a coastal area in Shanghai.

IF 8.2 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Science of the Total Environment Pub Date : 2024-12-20 Epub Date: 2024-11-20 DOI:10.1016/j.scitotenv.2024.176899
Yusen Duan, Yan Liu, Kun Zhang, Li Li, Juntao Huo, Jia Chen, Qingyan Fu, Zongjiang Gao, Guangli Xiu, Tingting Hu
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引用次数: 0

Abstract

Chlorine plays a critical role in atmospheric chemistry. Marine chloride depletion, as a significant source of atmospheric chlorine, impacts coastal acid deposition, atmospheric oxidizing capacity, and global climate. Based on continuous monitoring data of PM2.5 water soluble ions, criteria pollutants, and meteorological data at Chongming Dongtan supersite from 2019 to 2022, variations in chloride depletion and related impact factors were analyzed. Using trajectory analysis via Concentration Weighted Trajectory (CWT) method, the main source regions contributing to chloride depletion were identified. The influence of meteorological conditions on chloride depletion was examined, and the contribution of typical chloride depletion processes to ozone was analyzed using the community atmospheric chemistry box model Chemistry As A Box model Application/Module Efficiently Calculating the Chemistry of the Atmosphere (CAABA/MECCA). Results show that chloride depletion increases in summer and decreases in winter. Chloride depletion reaches to peak around noon and gradually decreases after 6 p.m. CWT analysis reveals that airflows predominantly originate from ocean during periods of chloride depletion. As a large coastal port, shipping NOx emissions produce abundant N2O5 through oxidation processes. The liquid-phase reactions of N2O5 with sea-salt aerosol via liquid-phase reactions result in chloride depletion. Chlorine depletion follows the same trend as O3 and temperature, while showing an inverse trend with NO2, N2O5, NO3, and pH. Modelling results indicate that oceanic chlorine depletion contributes approximately 8 ppb, 0.1 ppt, and 18 ppt to the enhancement of O3, OH, and HO2 concentrations. Therefore, attention should be paid to the contribution of ship emissions through chloride depletion mechanisms to O3 pollution in coastal port cities. Chloride depletion serves as a typical indicator of the impact of chloride circulation on coastal ozone.

氯化物消耗的变化及其对臭氧形成的影响:上海沿海地区案例研究。
氯在大气化学中起着至关重要的作用。海洋氯化物消耗作为大气氯的重要来源,影响着沿海酸沉降、大气氧化能力和全球气候。基于崇明东滩超级站点2019年至2022年PM2.5水溶性离子、标准污染物和气象数据的连续监测数据,分析了氯耗损的变化及相关影响因素。通过浓度加权轨迹法(CWT)进行轨迹分析,确定了氯化物耗损的主要来源区域。研究了气象条件对氯化物耗损的影响,并利用群体大气化学箱模型 "化学作为箱模型应用/高效计算大气化学模块(CAABA/MEECCA)"分析了典型氯化物耗损过程对臭氧的贡献。结果表明,氯化物消耗在夏季增加,冬季减少。CWT 分析表明,在氯化物消耗期间,气流主要来自海洋。作为一个大型沿海港口,航运排放的氮氧化物在氧化过程中会产生大量的 N2O5。N2O5 与海盐气溶胶通过液相反应导致氯耗竭。氯耗损与 O3 和温度的变化趋势相同,而与 NO2、N2O5、NO3 和 pH 值的变化趋势相反。模拟结果表明,海洋氯耗损对 O3、OH 和 HO2 浓度的增加分别产生了约 8 ppb、0.1 ppt 和 18 ppt 的影响。因此,应关注船舶排放通过氯耗损机制对沿海港口城市 O3 污染的贡献。氯化物耗损是氯化物循环对沿岸臭氧影响的典型指标。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Science of the Total Environment
Science of the Total Environment 环境科学-环境科学
CiteScore
17.60
自引率
10.20%
发文量
8726
审稿时长
2.4 months
期刊介绍: The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.
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