Monthly resolved modelled oceanic emissions of carbonyl sulphide and carbon disulphide for the period 2000–2019
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Published:2021-05-18
Issue:5
Volume:13
Page:2095-2110
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ISSN:1866-3516
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Container-title:Earth System Science Data
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language:en
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Short-container-title:Earth Syst. Sci. Data
Author:
Lennartz Sinikka T.ORCID, Gauss Michael, von Hobe MarcORCID, Marandino Christa A.
Abstract
Abstract. Carbonyl sulphide (OCS) is the most abundant, long-lived
sulphur gas in the atmosphere and a major supplier of sulphur to the
stratospheric sulphate aerosol layer. The short-lived gas carbon disulphide
(CS2) is oxidized to OCS and constitutes a major indirect source to the
atmospheric OCS budget. The atmospheric budget of OCS is not well
constrained due to a large missing source needed to compensate for
substantial evidence that was provided for significantly higher sinks.
Oceanic emissions are associated with major uncertainties. Here we provide a
first, monthly resolved ocean emission inventory of both gases for the
period 2000–2019 (available at
https://doi.org/10.5281/zenodo.4297010) (Lennartz et al.,
2020a). Emissions are calculated with a numerical box model (2.8∘×2.8∘ resolution at the Equator, T42 grid) for the oceanic
surface mixed layer, driven by ERA5 data from ECMWF and chromophoric dissolved organic matter (CDOM) from
Aqua MODIS. We find that interannual variability in OCS emissions is smaller
than seasonal variability and is mainly driven by variations in CDOM, which influences both
photochemical and light-independent production. A comparison with a global
database of more than 2500 measurements reveals overall good agreement.
Emissions of CS2 constitute a larger sulphur source to the atmosphere
than OCS and equally show interannual variability connected to variability
in CDOM. The emission estimate of CS2 is associated with higher
uncertainties as process understanding of the marine cycling of CS2 is
incomplete. We encourage the use of the data provided here as input for
atmospheric modelling studies to further assess the atmospheric OCS budget
and the role of OCS in climate.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
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