Description: Monthly resolved modelled oceanic emissions of carbonyl sulfide for the period 2000-2019

This title appears in the Scientific Report : 2020

Monthly resolved modelled oceanic emissions of carbonyl sulfide for the period 2000-2019

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 at...

Personal Name(s):	Lennartz, S. T. (Corresponding author)
	Gauss, M. / von Hobe, Marc / Marandino, C. A.
Contributing Institute:	Stratosphäre; IEK-7
Published in:	Earth system science data discussions, 2020 (2020) S. 389
Imprint:	Bremerhaven Copernics Publication 2020
DOI:	10.5194/essd-2020-389
Document Type:	Journal Article
Research Program:	Composition and dynamics of the upper troposphere and middle atmosphere
Link:	OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/26783 in citations.
Please use the identifier: http://dx.doi.org/10.5194/essd-2020-389 in citations.

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 https://doi.org/10.5281/zenodo.4297010) (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.