ABSTRACT

A 1D model of the CS₂ reaction network with the addition of the photo-oxidation pathway has been developed and quantitatively studied. The reaction pathway analysis focusing on the sulfur element was applied to determine the importance of the photo-oxidation pathway in the atmospheric CS₂ sink resulting in a 15.8% of sulfur in the CS₂ reaction network passes through the photo-oxidation pathway under a global average solar radiation conditions and ranging from 8.1% to 18% depending on the irradiance intensity. The concentration of COS and SO₂, the main products of CS₂ atmospheric oxidation, changed slightly from the sulfur cycle developed with the updated CS₂ reaction network. 7.4% of the COS comes from the new pathway and a total of 40.9% of COS comes from the conversion of CS₂. A sulfur budget for the main species in the sulfur cycle was constructed, and the CS₂ lifetime was estimated to be 2–3 days. The newly added photo-oxidation pathway plays an moderate role in the CS₂ reaction network and has a high variability under specific geochemical conditions. The results of this report should be taken as an incentive for 3D climate-chemistry models to account for local COS sources.