1990年至2020年中国硫酸盐和酸盐变化的评估:洞察来源贡献和形成途径
Jingyuan Cao1, Boyue Zheng2, Jiaxuan Chen3
1Center of Environmental Pollution and Greenhouse Gases Co-control, Chinese Academy of Environmental Planning, Beijing 100041, China.
Journal of hazardous materials
|February 15, 2025
概括
中国的酸盐 (NO3−) 污染现在超过了硫酸盐 (SO42−),主要是工业和运输排放造成的. 需要有针对性的战略来减少关键氧化剂并有效管理区域空气质量.
科学领域:
- 大气化学和空气质量建模
- 环境科学与公共卫生
背景情况:
- 硫酸盐 (SO42−) 和酸盐 (NO3−) 是细颗粒物 (PM2.5) 的关键组成部分,对空气质量和公共健康产生重大影响.
- 了解它们的空间和时间变化,来源和形成途径对于有效控制空气污染至关重要.
研究的目的:
- 从1990年到2020年,全面评估SO42−和NO3−度在中国的空间和时间变化.
- 通过修订的社区多级空气质量建模系统 (CMAQ) 阐明SO42−和NO3−的来源贡献和形成途径.
- 为制定有针对性的空气质量管理战略提供见解.
主要方法:
- 使用修订的社区多级空气质量建模系统 (CMAQ) 进行详细的空气质量模拟.
- 从1990年到2020年,在中国主要地区分析了SO42−和NO3−的空间和时间变化.
- 量化来源贡献 (工业,运输) 和确定形成途径 (初级排放,异质反应,氧化反应).
主要成果:
- 自2017年以来,中国大多数地区的酸盐 (NO3−) 度超过了硫酸盐 (SO42−).
- 在所有研究地区,工业排放是SO42−的主要来源.
- 对于NO3−,工业排放在BTH和YRD中占主导地位,而运输在PRD中是关键;SCB和FWP显示了可比的贡献.
- SO42−形成途径在区域上有所不同:BTH/YRD中的初级排放,SCB/FWP中的异质反应,PRD中的水相氧化.
- NO3−的形成是一致的,主要是由OH对NO2的气相氧化和异质N2O5反应 (>90%) 驱动的.
结论:
- 空气质量管理战略必须考虑污染源和形成机制的区域差异.
- 优先减少关键氧化剂对于减轻二次气溶形成至关重要.
- 该研究为政策制定者提供了有价值的数据,以制定有效的空气污染控制措施在中国.
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