Direct oceanic emissions unlikely to account for the missing source of atmospheric carbonyl sulfide
Item
Title (Dublin Core)
Direct oceanic emissions unlikely to account for the missing source of atmospheric carbonyl sulfide
Description (Dublin Core)
The climate active trace-gas carbonyl sulfide (OCS) is the most abundant sulfur gas in the atmosphere. A missing source in its atmospheric budget is currently suggested, resulting from an upward revision of the vegetation sink. Tropical oceanic emissions have been proposed to close the resulting gap in the atmospheric budget. We present a bottom-up approach including (i) new observations of OCS in surface waters of the tropical Atlantic, Pacific and Indian oceans and (ii) a further improved global box model to show that direct OCS emissions are unlikely to account for the missing source. The box model suggests an undersaturation of the surface water with respect to OCS integrated over the entire tropical ocean area and, further, global annual direct emissions of OCS well below that suggested by top-down estimates. In addition, we discuss the potential of indirect emission from CS<sub>2</sub> and dimethylsulfide (DMS) to account for the gap in the atmospheric budget. This bottom-up estimate of oceanic emissions has implications for using OCS as a proxy for global terrestrial CO<sub>2</sub> uptake, which is currently impeded by the inadequate quantification of atmospheric OCS sources and sinks.
Creator (Dublin Core)
Lennartz, Sinikka T.
Marandino, Christa A.
Hobe, Marc
Cortes, Pau
Quack, Birgit
Simo, Rafel
Booge, Dennis
Pozzer, Andrea
Steinhoff, Tobias
Arevalo-Martinez, Damian L.
Kloss, Corinna
Bracher, Astrid
Röttgers, Rüdiger
Atlas, Elliot
Krüger, Kirstin
Date (Dublin Core)
2018-09-09
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-17-385-2017
https://acp.copernicus.org/articles/17/385/2017/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
