Impact of particulate nitrate photolysis on air quality over the Northern Hemisphere.

ABSTRACT: We use the Community Multiscale Air Quality (CMAQv5.4) model to examine the potential impact of particulate nitrate (pNO₃^-) photolysis on air quality over the Northern Hemisphere. We estimate the photolysis frequency of pNO₃^- by scaling the photolysis frequency of nitric acid (HNO₃) with an enhancement factor that varies between 10 and 100 depending on pNO₃^- and sea-salt aerosol concentrations and then perform CMAQ simulations without and with pNO₃^- photolysis to quantify the range of impacts on tropospheric composition. The photolysis of pNO₃^- produces gaseous nitrous acid (HONO) and nitrogen dioxide (NO₂) over seawater thereby increasing atmospheric HONO and

SUBMITTER: Sarwar G 

PROVIDER: S-EPMC10922608 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature