Improving the representation of HONO chemistry in CMAQ and examining its impact on haze over China.

ABSTRACT: We compare Community Multiscale Air Quality (CMAQ) model predictions with measured nitrous acid (HONO) concentrations in Beijing, China for December 2015. The model with the existing HONO chemistry in CMAQ severely under-estimates the observed HONO concentrations with a normalized mean bias of -97%. We revise the HONO chemistry in the model by implementing six additional heterogeneous reactions in the model: reaction of nitrogen dioxide (NO₂) on ground surfaces, reaction of NO₂ on aerosol surfaces, reaction of NO₂ on soot surfaces, photolysis of aerosol nitrate, nitric acid displacement reaction, and hydrochloric acid displacement reaction. The model with the revised chemistry substantially increases HONO predictions and improves the comparison with observe

SUBMITTER: Zhang S 

PROVIDER: S-EPMC8597575 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature