Shaojie Song

TL;DR: In this paper, the authors calculated pH values with different assumptions with regard to model inputs and particle phase states and found that the large discrepancy is due primarily to differences in the model assumptions adopted in previous studies.

TL;DR: Evidence is shown from field observations of a haze event that rapid oxidation of SO2 by nitrogen dioxide and nitrous acid takes place, producing nitrous oxide together with sulfate, which could provide an explanation for sulfate formation under some winter haze conditions.

TL;DR: In this article, the authors explicitly implement four heterogeneous sulfate formation metrics into a regional chemical transport model, in addition to gas phase and in-cloud sulfate production, and compare the model results with measurements of sulfate concentrations and oxygen isotopes, Δ17O ( SO 4 2 - ), in the winter of 2014-2015.

TL;DR: In this paper, the authors show that ozone is driven by Hox radicals from photolysis of formaldehyde, overcoming the radical titration caused by high emissions of nitrogen oxides (NOx) from fuel combustion.

TL;DR: In this paper, the authors show that the GEOS-Chem atmospheric chemistry model successfully simulates the nitrate concentrations and trends and find that winter mean nitrate would have increased over 2013-2018 were it not for favourable meteorology.