Lennartz, Sinikka T. , Simon, H, Booge, Dennis , Zhou, Li and Marandino, Christa (2024) CS2 Cycling in Seawater: Dark Production and UV Light Driven Consumption. Geophysical Research Letters, 51 (5). Art.Nr. e2023GL107024. DOI 10.1029/2023GL107024.

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Abstract

Carbon disulfide (CS2) has recently gained attention as an important precursor for the atmospheric trace gas carbonyl sulfide (OCS), which delivers sulfur to the stratospheric sulfur layer and impacts the radiative budget of the Earth. CS2 is naturally produced in the ocean and emitted to the atmosphere. However, the magnitude of its marine emissions is only poorly constrained due to lacking understanding of its production and consumption processes. Here, we present incubation experiments with and without UV light treatment and provide evidence for a previously not considered UV-light-driven degradation process of CS2 in seawater, following first-order kinetics. In addition to its already known photochemical production process, CS2 production is found in the dark, depending on the amount of dissolved organic sulfur present in seawater. We provide novel production and consumption rates of CS2 in seawater that pave the way toward mechanistically quantifying marine emissions of this important trace gas.
Key Points:
- Carbon disulfide in seawater is degraded by UV light at time scales of days
- Carbon disulfide is produced in seawater without UV light at rates comparable to photochemical production
- Carbon disulfide dark production is limited by dissolved organic sulfur

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