丰富的的二次有机气溶形成由云处理加速
1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP), Department of Environmental Science & Engineering, Institute of Atmospheric Sciences, Fudan University, Shanghai 200438, China.
iScience
|November 29, 2023
概括
云过程显著转化有机化合物 (CHON),对于二次有机气溶 (SOA) 至关重要. 这些反应增强了CHON的多样性,通过含氨和BVOCs的水相化学形成新的化合物.
科学领域:
- 大气化学 大气化学
- 气溶科学 气溶科学
- 云微物理 云微物理
背景情况:
- 有机化合物 (CHON) 是二次有机气溶 (SOA) 的重要组成部分.
- 在云环境中CHONs的形成机制仍然不太清楚.
- 据假设云过程 (CPs) 影响CHON物种化和丰富性.
研究的目的:
- 在云计算过程中调查CHON的转换路径.
- 阐明水相反应在云中CHON形成中的作用.
- 量化CP对CHON多样性和丰富性的贡献.
主要方法:
- 模拟含有碳烯的生物原挥发性有机化合物 (BVOC) 和氨 (NH3) 的臭氧溶解中间体的水相反应.
- 分析CHON物种化,包括氧原子数和双键等价值 (DBE).
- 对归因于云计算过程的CHON形成路径的量化.
主要成果:
- 云层过程显著增强了CHON的多样性,氧气计数从1-10和DBE值从2-10之间.
- 涉及NH3和CHO前体的水相反应被认为是CHON形成的关键途径.
- 这种机制约占云水中CHON数量的75%左右.
- NH3和BVOC臭氧分解中间体之间的反应约占所有CHON的三分之二.
结论:
- 云层过程在大气中有机化合物的形成和演变中起着至关重要的作用.
- 水相反应,特别是涉及氨,是云中CHON形成的主要驱动因素.
- 了解CP期间的CHON形成对于准确建模SOA组成和气候影响至关重要.
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