22 Dec 2020

22 Dec 2020

Review status: this preprint is currently under review for the journal ESSD.

Monthly resolved modelled oceanic emissions of carbonyl sulfide and carbon disulfide for the period 2000–2019

Sinikka T. Lennartz1, Michael Gauss2, Marc von Hobe3, and Christa A. Marandino4 Sinikka T. Lennartz et al.
  • 1Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129 Oldenburg, Germany
  • 2Norwegian Meteorological Institute, PO 43 Blindern, 0313 Oslo, Norway
  • 3Institute for Energy and Climate Research (IEK-7), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
  • 4Geomar Helmholtz-Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany

Abstract. Carbonyl sulfide (OCS) is the most abundant, long-lived sulphur gas in the atmosphere and a major supplier of sulfur to the stratospheric sulfate aerosol layer. The short-lived gas carbon disulfide (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 (Lennartz et al., 2020a). Emissions are calculated with a numerical box model (resolution 2.8° × 2.8° at equator, T42 grid) for the surface mixed layer. We find that interannual variability in OCS emissions is smaller than seasonal variability, and is mainly driven by variations in chromophoric dissolved organic matter (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 sulfur source to the atmosphere than OCS, and equally show interannual variability connected to variability of 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.

Sinikka T. Lennartz et al.

Status: open (until 16 Feb 2021)
Status: open (until 16 Feb 2021)
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Sinikka T. Lennartz et al.

Data sets

Carbonyl Sulfide (OCS/COS) and Carbon Disulfide (CS2): global modelled marine surface concentrations and emissions, 2000-2019 Lennartz, Sinikka T., Gauss, Michael, von Hobe, Marc, and Marandino, Christa A.

Sinikka T. Lennartz et al.


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Short summary
This study provides a marine emission inventory for the sulfur gases carbonyl sulfide (OCS) and carbon disulfide (CS2), derived from a numerical model of the surface ocean in monthly resolution for the period 2000–2019. Comparison with a database of seaborne observations reveals very good agreement for OCS. Interannual variability of both gases seems to be mainly driven by the amount of chromophoric dissolved organic matter present in surface water.