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@ARTICLE{Davidson:1050689,
author = {Davidson, Chen and Angert, Alon and Avidani, Yasmin and
Lennartz, Sinikka T. and Hobe, Marc von and Amrani, Alon},
title = {{S}ources of marine carbonyl sulfide and its precursors
traced by sulfur isotopes},
journal = {Limnology and oceanography},
volume = {70},
number = {11},
issn = {0024-3590},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2026-00440},
pages = {3172-3185},
year = {2025},
abstract = {Carbonyl 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.},
cin = {ICE-4},
ddc = {333.7},
cid = {I:(DE-Juel1)ICE-4-20101013},
pnm = {2112 - Climate Feedbacks (POF4-211)},
pid = {G:(DE-HGF)POF4-2112},
typ = {PUB:(DE-HGF)16},
doi = {10.1002/lno.70196},
url = {https://juser.fz-juelich.de/record/1050689},
}