Journal article

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

Wang Z, Hu M, Mogensen D, Yue D, Zheng J, Zhang R, Liu Y, Yuan B, Li X, Shao M, Zhou L, Wu Z, Wiedensohler A, Boy M ...see all

Atmospheric Chemistry and Physics, vol. 13, issue 21 (2013) pp. 11157-11167

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Simulations of sulfuric acid concentration and new particle formation
are performed by using the zero-dimensional version of the model MALTE
(Model to predict new Aerosol formation in the Lower TropospherE) and
measurements from the Campaign of Air Quality Research in Beijing and
Surrounding areas (CAREBeijing) in 2008. Chemical reactions from the
Master Chemical Mechanism version 3.2 (MCM v3.2) are used in the model.
High correlation (slope = 0.72, R = 0.74) between the modelled and
observed sulfuric acid concentrations is found during daytime
(06:00-18:00). The aerosol dynamics are simulated by the University of
Helsinki Multicomponent Aerosol (UHMA) model including several
nucleation mechanisms. The results indicate that the model is able to
predict the on- and offset of new particle formation in an urban
atmosphere in China. In addition, the number concentrations of newly
formed particles in kinetic-type nucleation including homogenous
homomolecular (J=K{[}H2SO4](2)) and homogenous heteromolecular
nucleation involving organic vapours (J=K-het{[}H2SO4]{[}Org]) are in
satisfactory agreement with the observations. However, the specific
organic compounds that possibly participate in the nucleation process
should be investigated in further studies. For the particle growth, only
a small fraction of the oxidized total organics condense onto the
particles in polluted environments. Meanwhile, the OH and O-3 oxidation
mechanism contribute 5.5% and 94.5% to the volume concentration of
small particles, indicating the particle growth is more controlled by
the precursor gases and their oxidation by O-3.

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