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跨区域NO2驱动冬季酸盐来源和北中国平原和长江三角洲之间的形成差异

Hong-Wei Xiao¹, Tian-Shu Chen¹, Chun-Fen Guan²

¹School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai 200240, China.

Journal of hazardous materials

|October 29, 2025

概括

来自中国北方平原的二氧化跨区域运输对长江三角洲的酸盐污染产生了重大影响,尤其是在严重的雾事件期间. 区域合作对于有效的空气质量管理至关重要.

科学领域:

大气化学大气化学
环境科学环境科学
空气质量研究空气质量研究

背景情况:

颗粒物 (PM2.5) 和酸盐对健康构成重大风险.
中国的清洁空气行动计划已经减少了污染,但严重的雾仍然存在.
酸盐气溶对氧化物减少的反应有限,跨区域运输量度不佳.

研究的目的:

调查北中国平原 (NCP) 和长江三角洲 (YRD) 的酸盐形成和来源.
量化跨区域运输对YRD中酸盐污染的贡献.
了解夜间化学和当地的与运输来源在雾事件中的作用.

主要方法:

在冬季在NCP和YRD同时收集酸盐的双同位素.
对酸盐形成途径和来源贡献的分析.
对YRD酸盐喷雾剂的跨区域NO2运输影响的评估.

主要成果:

在NCP和YRD中,夜间化学作用主导了酸盐的形成.
NO3+HC过程对NCP酸盐的形成贡献了约20%.
来自NCP的跨区域NO2平均贡献了约30%的YRD酸盐,在YRD雾开始时达到90%.
与清洁日相比,在YRD雾的日子里,当地移动来源的贡献更高.

结论:

来自NCP的跨区域NO2运输是YRD中酸盐气溶形成的主要驱动因素.
酸盐来源在NCP中稳定,但在YRD中随着雾条件的变化而变化.
有效的空气质量管理需要区域协调,以应对跨区域的污染.

关键词:

喷雾剂酸盐是一种气溶酸盐.具有双同位素的双同位素.形成路径的形成路径.跨区域运输跨区域运输

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