Prof. Zhe Wang’s group took the lead in field studies of heterogeneous N2O5/ClNO2 chemistry on real ambient aerosols in different regions of China. An in-situ methodology has been developed for directly measuring the heterogeneous activity of reactive nitrogen oxides on ambient aerosols. We developed an improved parameterization of γN2O5, which significantly improves the model prediction of NOx and secondary nitrate in the polluted regions of China. By using the observation-based chemical model, we evaluated the impacts of heterogeneous chemistry of reactive nitrogen on radical chemistry, ozone, and secondary aerosol formation, providing scientific support to the mitigation of regional air pollution in China.
Simultaneous measurements and chemical characterization of gas, aerosol, and cloud water have been conducted in Hong Kong for the first time. The gas-aerosol-cloud interactions have been investigated by combining field measurement and multiphase chemistry modeling. The findings have demonstrated the importance of aqueous/heterogeneous chemical processes on the secondary organic aerosol formation.
The photochemical reaction of various VOCs is a significant source of O3 and SOA formation. Our research uses state-of-the-art techniques in field observations and lab experiments to probe what oxidation products are produced with different radicals and multigenerational oxidation, which of precursors and oxidation products contribute to O3 and SOA formation, and how. We aim to depict a full picture of the evolution and oxidation of different VOCs and to characterize the oxidation/intermediate products on the molecular level, allowing more accurate source apportionment of O3 and SOA produced by important VOCs.
