CAMx-UNIPAR Simulation of SOA Mass Formed from Multiphase Reactions of Hydrocarbons under the Central Valley Urban Atmospheres of California-猫眼课题宝

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2023

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Yu-Jin Jo;M. Jang;Sanghee Han;Azad Madhu;Bonyoung Koo;Yiqin Jia;Zechen Yu;Soontae Kim;Jinsoo Park

.在15个综合空气质量模式（CAMx）的基础上建立了统一的分配-气溶胶相反应（UNIPAR）模式，通过捕捉区域尺度上碳氢化合物（HCs）的多相反应过程来处理二次有机气溶胶（SOA）的形成过程。SOA的增长进行了模拟，使用广泛的人为碳氢化合物，包括10个芳烃和直链烷烃具有不同的碳长度。大气过程中的生物成因的碳氢化合物（异戊二烯，萜烯，和倍半萜）的主要氧化途径（臭氧，OH自由基，和硝酸根）进行了模拟，以预测白天和夜间SOA的形成。UNIPAR 20模型简化了源自半明确预测的气体产品及其非均相化学的集总物质的多相分配，以在有机气溶胶和无机水相中形成非挥发性低聚物质。CAMx-UNIPAR模型预测了2018年冬季美国加州四个地面城市站点（圣何塞、萨克拉门托、弗雷斯诺和贝克斯菲尔德）的SOA形成。总的来说，模拟的总有机物的质量浓度，包括初级OA（POA）和SOA，表现出良好的25与观测一致。模拟的加州城市地区的SOA质量主要由烷烃和

. The UNIfied Partitioning-Aerosol phase Reaction (UNIPAR) model was established on the 15 Comprehensive Air quality Model with extensions (CAMx) to process Secondary Organic Aerosol (SOA) formation by capturing multiphase reactions of hydrocarbons (HCs) in regional scales. SOA growth was simulated using a wide range of anthropogenic HCs including ten aromatics and linear alkanes with different carbon-lengths. The atmospheric processes of biogenic HCs (isoprene, terpenes, and sesquiterpene) were simulated for the major oxidation paths (ozone, OH radicals, and nitrate radicals) to predict day and night SOA formation. The UNIPAR 20 model streamlined the multiphase partitioning of the lumping species originating from semi-explicitly predicted gas products and their heterogeneous chemistry to form non-volatile oligomeric species in both organic aerosol and inorganic aqueous phase. The CAMx-UNIPAR model predicted SOA formation at four ground urban sites (San Jose, Sacramento, Fresno, and Bakersfield) in California, United States during wintertime 2018. Overall, the simulated mass concentrations of the total organic matter, consisting of primary OA (POA) and SOA, showed a good 25 agreement with the observations. The simulated SOA mass in the urban areas of California was predominated by alkane and

CAMx-UNIPAR Simulation of SOA Mass Formed from Multiphase Reactions of Hydrocarbons under the Central Valley Urban Atmospheres of California

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