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The simulations of sulfuric acid concentration and new particle formation in an urban atmosphere in China

by Z. B. Wang, M. Hu, D. Mogensen, D. L. Yue, J. Zheng, R. Y. Zhang, Y. Liu, B. Yuan, X. Li, M. Shao, L. Zhou, Z. J. Wu, A. Wiedensohler, M. Boy show all authors
Atmospheric Chemistry and Physics ()
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Simulations of sulfuric acid concentration and new particle formation\nare performed by using the zero-dimensional version of the model MALTE\n(Model to predict new Aerosol formation in the Lower TropospherE) and\nmeasurements from the Campaign of Air Quality Research in Beijing and\nSurrounding areas (CAREBeijing) in 2008. Chemical reactions from the\nMaster Chemical Mechanism version 3.2 (MCM v3.2) are used in the model.\nHigh correlation (slope = 0.72, R = 0.74) between the modelled and\nobserved sulfuric acid concentrations is found during daytime\n(06:00-18:00). The aerosol dynamics are simulated by the University of\nHelsinki Multicomponent Aerosol (UHMA) model including several\nnucleation mechanisms. The results indicate that the model is able to\npredict the on- and offset of new particle formation in an urban\natmosphere in China. In addition, the number concentrations of newly\nformed particles in kinetic-type nucleation including homogenous\nhomomolecular (J=K{[}H2SO4](2)) and homogenous heteromolecular\nnucleation involving organic vapours (J=K-het{[}H2SO4]{[}Org]) are in\nsatisfactory agreement with the observations. However, the specific\norganic compounds that possibly participate in the nucleation process\nshould be investigated in further studies. For the particle growth, only\na small fraction of the oxidized total organics condense onto the\nparticles in polluted environments. Meanwhile, the OH and O-3 oxidation\nmechanism contribute 5.5% and 94.5% to the volume concentration of\nsmall particles, indicating the particle growth is more controlled by\nthe precursor gases and their oxidation by O-3.

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