Photochemical oxidation and dispersion of gaseous sulfur compounds from natural and anthropogenic sources around a coastal location

다국어 초록 (Multilingual Abstract)

The photochemical oxidation and dispersion of reduced sulfur compounds (RSCs: H<SUB>2</SUB>S, CH<SUB>3</SUB>SH, DMS, CS<SUB>2</SUB>, and DMDS) emitted from anthropogenic (A) and natural (N) sources were evaluated based on a numerical modeling approach. The anthropogenic emission concentrations of RSCs were measured from several sampling sites at the Donghae landfill (D-LF) (i.e., source type A) in South Korea during a series of field campaigns (May through December 2004). The emissions of natural RSCs in a coastal study area near the D-LF (i.e., source type N) were estimated from sea surface DMS concentrations and transfer velocity during the same study period. These emission data were then used as input to the CALPUFF dispersion model, revised with 34 chemical reactions for RSCs. A significant fraction of sulfur dioxide (SO<SUB>2</SUB>) was produced photochemically during the summer (about 34% of total SO<SUB>2</SUB> concentrations) followed by fall (21%), spring (15%), and winter (5%). Photochemical production of SO<SUB>2</SUB> was dominated by H<SUB>2</SUB>S (about 55% of total contributions) and DMS (24%). The largest impact of RSCs from source type A on SO<SUB>2</SUB> concentrations occurred around the D-LF during summer. The total SO<SUB>2</SUB> concentrations produced from source type N around the D-LF during the summer (a mean SO<SUB>2</SUB> concentration of 7.4ppbv) were significantly higher than those (@?0.3ppbv) during the other seasons. This may be because of the high RSC and SO<SUB>2</SUB> emissions and their photochemistry along with the wind convergence.