Modeling the Global Impact of Chlorine Chemistry on Secondary Organic Aerosols

IF 10.8 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Xi Liu, Leyang Liu, Bingqing Zhang, Pengfei Liu, Ru-Jin Huang, Lea Hildebrandt Ruiz, Ruqian Miao, Qi Chen, Xuan Wang
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Abstract

Simulation of secondary organic aerosol (SOA) in models has been an uncertain component in determining the impacts of atmospheric aerosols on air quality and climate. Recent studies have shown that reactive chlorine can rapidly oxidize volatile organic compounds (VOCs), trigger SOA formation, and alter other oxidants, thus having a potentially significant effect on SOA, which has not been thoroughly investigated at the global scale. Here, we developed a chlorine-SOA simulation within a global chemical transport model along with updated anthropogenic continental chlorine emissions. Our simulations demonstrate that chlorine chemistry increases the annual mean boundary layer SOA by 5–12% over most continents while decreasing SOA by 5–11% over northern Atlantic and Pacific oceans, which are in the right direction to narrow existing discrepancies between models and observations. Notably, sensitivity simulations in China with observed high chlorine levels capture the temporal variations of both observed fine Cl and organic aerosol, showing an increase in SOA by more than 100%. Our study also reveals that polluted regions, which have ample emissions of both chlorine species and VOCs, exhibit potential chlorinated SOA, which are commonly toxic, contributing up to 15% to total SOA.

Abstract Image

模拟氯化学对二次有机气溶胶的全球影响
在模式中对二次有机气溶胶(SOA)的模拟一直是确定大气气溶胶对空气质量和气候影响的一个不确定因素。最近的研究表明,活性氯可以快速氧化挥发性有机化合物(VOCs),触发SOA形成,并改变其他氧化剂,因此对SOA有潜在的重大影响,这在全球范围内尚未得到彻底的研究。在这里,我们在全球化学运输模型中开发了氯- soa模拟,并更新了人为大陆氯排放。我们的模拟表明,氯化学使大多数大陆的年平均边界层SOA增加了5-12%,而使北大西洋和太平洋的年平均边界层SOA减少了5-11%,这是缩小模式与观测之间现有差异的正确方向。值得注意的是,在中国观测到高氯浓度的敏感性模拟捕获了观测到的细氯和有机气溶胶的时间变化,显示SOA增加了100%以上。我们的研究还表明,污染地区的氯和挥发性有机化合物的排放都很充足,表现出潜在的氯化SOA,这通常是有毒的,占总SOA的15%。
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来源期刊
环境科学与技术
环境科学与技术 环境科学-工程:环境
CiteScore
17.50
自引率
9.60%
发文量
12359
审稿时长
2.8 months
期刊介绍: Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.
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