Impact of dimethylsulfide chemistry on air quality over the Northern Hemisphere.

ABSTRACT: We implement oceanic dimethylsulfide (DMS) emissions and its atmospheric chemical reactions into the Community Multiscale Air Quality (CMAQv53) model and perform annual simulations without and with DMS chemistry to quantify its impact on tropospheric composition and air quality over the Northern Hemisphere. DMS chemistry enhances both sulfur dioxide (SO₂) and sulfate ( SO42- ) over seawater and coastal areas. It enhances annual mean surface SO₂ concentration by +46 pptv and SO42- by +0.33 μg/m³ and decreases aerosol nitrate concentration by -0.07 μg/m³ over seawater compared to the simulation without DMS chemistry. The changes decrease with altitude and are limited to the lower atmosphere. Impacts of DMS chemistry on SO42- are largest in the summ

SUBMITTER: Zhao J 

PROVIDER: S-EPMC7592702 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature