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001050689 1001_ $$0P:(DE-HGF)0$$aDavidson, Chen$$b0
001050689 245__ $$aSources of marine carbonyl sulfide and its precursors traced by sulfur isotopes
001050689 260__ $$aOxford [u.a.]$$bWiley-Blackwell$$c2025
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001050689 520__ $$aCarbonyl sulfide (OCS) is a major precursor of stratospheric sulfate aerosols and a proxy for terrestrial photosynthesis. In recent years, sulfur-isotope measurements (δ34S) of OCS emerged as an approach to constrain the OCS budget. Yet, such measurements are still scarce for aquatic OCS. Here we present a large dataset of δ34S values of marine OCS. In addition, we present δ34S values of marine carbon disulfide (CS2) and dimethyl sulfide (DMS), which in the air, act as important precursors of tropospheric OCS. Samples were collected at the Atlantic Ocean, the Red Sea, the Mediterranean Sea, the Wadden Sea, and the North Sea. The gases were sampled by a water–air equilibrator, preserved in canisters, and analyzed via a preconcentration system coupled to a gas chromatograph connected to a multi-collector inductively coupled plasma mass spectrometer. We found δ34S values of −3.8‰ to 19.4‰ for OCS, −10.5‰ to 20‰ for CS2, and 14–23‰ for DMS. These δ34S values are controlled mainly by two endmembers: production in the water column and production in sediments. Lab experiments suggest that the 34S-fractionation of OCS photo-production is 0.8‰ ± 0.5‰. In addition, based on measurements from the Atlantic Ocean, we calculated the 34S-fractionation of OCS dark-production as −6‰ ± 2‰. This new data significantly improves our knowledge of the sulfur isotope distribution of marine OCS and helps identify its different sources, sinks, and production pathways.
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001050689 7001_ $$0P:(DE-HGF)0$$aAngert, Alon$$b1$$eCorresponding author
001050689 7001_ $$0P:(DE-HGF)0$$aAvidani, Yasmin$$b2
001050689 7001_ $$0P:(DE-HGF)0$$aLennartz, Sinikka T.$$b3
001050689 7001_ $$0P:(DE-Juel1)129170$$aHobe, Marc von$$b4$$ufzj
001050689 7001_ $$0P:(DE-HGF)0$$aAmrani, Alon$$b5$$eCorresponding author
001050689 773__ $$0PERI:(DE-600)2033191-5$$a10.1002/lno.70196$$n11$$p3172-3185$$tLimnology and oceanography$$v70$$x0024-3590$$y2025
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