AI Article Synopsis
- - The study examined the effects of natural dimethyl sulfide (DMS) and ship emissions on marine air quality and particulate matter (PM) around South Korea, using modeling from field data collected in 2017 and 2018.
- - DMS oxidation increased the levels of sulfur dioxide and sulfate in the atmosphere, while slightly decreasing nitrate levels, indicating its role in marine air chemistry.
- - Ship emissions significantly raised concentrations of sulfur oxides, nitrogen oxides, and ammonia, and were found to be a major contributor to non-sea-salt sulfur in PM, highlighting the impact of maritime activities on air quality.
Article Abstract
The impacts of natural dimethyl sulfide (DMS) and ship emissions on marine environments and particulate matter (PM) over the western and southern sea areas around South Korea were studied based on field campaigns from August-September 2017 and May-June 2018 using the Community Multi-scale Air Quality v5.3.2 modeling system. DMS oxidation enhanced the concentrations of both sulfur dioxide (SO) and sulfate (SO) in PM by 6.2-6.4% and 2.9-3.6%, respectively, in the marine atmosphere during the study period, whereas it slightly decreased nitrate (NO) concentrations (by -1.3%), compared to the simulation without DMS oxidation chemistry. Furthermore, ship emissions increased the concentrations of SO, NO, and NH by 4.5%, 23%, and 7.3%, respectively. Methane sulfonic acid concentration was 0.17 μg m, suggesting the importance of the addition channel in the DMS oxidation pathway. The model simulation indicated that ship emissions in the target area contributed dominantly to non-sea-salt SO, and the marine DMS emission source was non-negligible. The geographical distribution of PM toxicity (aerosol oxidative potential) was assessed in the marine atmosphere during the study period.
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| http://dx.doi.org/10.1016/j.scitotenv.2021.150928 | DOI Listing |
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