持续的无协调的人为排放减排促进了中国超大城市大气中的新粒子增长
Lizi Tang1, Zeyu Feng1, Dongjie Shang1
1State Key Laboratory of Regional Environment and Sustainability, International Joint Laboratory of Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing, China.
Nature communications
|July 21, 2025
概括
由于排放控制,大气中的新粒子增长率正在增加. 受减少挥发性有机化合物和氧化物影响的有氧化有机蒸气是这一趋势的关键驱动因素,影响城市空气质量.
科学领域:
- 大气化学 大气化学
- 空气质量科学 空气质量科学
- 环境科学 环境科学
背景情况:
- 新粒子的形成和增长对城市空气质量和气候产生重大影响.
- 了解颗粒生长的长期趋势和机制对于准确的空气质量评估至关重要.
- 目前的模型在预测城市空气质量演变方面面临挑战,原因是颗粒生长过程中的不确定性.
研究的目的:
- 调查北京城市新粒子增长率的趋势.
- 确定驱动粒子生长变化的关键化学物种.
- 阐明人为减排对粒子生长机制的影响.
主要方法:
- 2017年至2021年间北京城市大气数据的分析.
- 量化新粒子生长速度的量化.
- 化学分析以确定主要的贡献物种,特别是有氧化有机蒸汽.
- 评估排放控制策略 (VOC和NOx) 对前体度和挥发性的影响.
主要成果:
- 从2017年到2021年,在北京城市的秋季观察到新粒子增长率的增加趋势.
- 氧化有机蒸汽被确定为观察到的生长率变化的主要驱动因素.
- 虽然减少挥发性有机化合物前体降低了它们的总度,但同时减少氧化增加了低挥发性氧化有机蒸汽的部分,从而增强了颗粒的生长.
结论:
- 协调的人为排放控制对有氧化有机蒸汽的挥发性分布有复杂的影响.
- 挥发性有机化合物和氧化减排之间的相互作用导致新粒子生长率的意外增加.
- 有效改善空气质量需要全面了解排放控制策略如何影响大气气溶过程.
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