Molecular Composition of Oxygenated Organic Molecules and Their Contributions to Organic Aerosol in Beijing
Molecular Composition of Oxygenated Organic Molecules and Their Contributions to Organic Aerosol in Beijing
复制标题
含氧有机分子的分子组成及其对北京有机气溶胶的贡献
DOI：
10.1021/acs.est.1c05191
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Yee Jun Tham
中科院分区：
文献类型：
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作者：
Yonghong Wang;Petri Clusius;Chao Yan;Kaspar Dällenbach;Rujing Yin;Mingyi Wang;Xu-Cheng He;Biwu Chu;Yiqun Lu;Lubna Dada;Juha Kangasluoma;Pekka Rantala;Chenjuan Deng;Zhuohui Lin;Weigang Wang;Lei Yao;Xiaolong Fan;Wei Du;Jing Cai;Liine Heikkinen;Yee Jun Tham
在分子水平上理解环境二次有机气溶胶（SOA）的形成受到限制的形成机制和分析方法不足的阻碍。特别是在发展中国家，SOA相关的雾霾由于其对气候和人类健康的显著影响而受到极大关注。我们提出了在北京的气相挥发性有机化合物（VOCs），含氧有机分子（OOM），和颗粒相SOA的同时测量。我们发现，测量的OOM的冷凝解释了26-39%的有机气溶胶质量增长，在严重的雾霾事件中OOM对SOA的贡献增强。我们的新的研究结果提供了一个定量的分子连接从人为排放到可冷凝的有机氧化产物蒸气，其浓度在颗粒相SOA，并最终形成雾霾。
The understanding at a molecular level of ambient secondary organic aerosol (SOA) formation is hampered by poorly constrained formation mechanisms and insufficient analytical methods. Especially in developing countries, SOA related haze is a great concern due to its significant effects on climate and human health. We present simultaneous measurements of gas-phase volatile organic compounds (VOCs), oxygenated organic molecules (OOMs), and particle-phase SOA in Beijing. We show that condensation of the measured OOMs explains 26–39% of the organic aerosol mass growth, with the contribution of OOMs to SOA enhanced during severe haze episodes. Our novel results provide a quantitative molecular connection from anthropogenic emissions to condensable organic oxidation product vapors, their concentration in particle-phase SOA, and ultimately to haze formation.