EGU24-1257, updated on 08 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

On the contribution of boreal wetlands to the Northern Hemisphere carbonyl sulfide sink

Anna de Vries1, Georg Wohlfahrt1, Timo Vesala2, and Kukka-Maaria Kohonen3
Anna de Vries et al.
  • 1Ecology, Universität Innsbruck, Innsbruck, Austria (
  • 2Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland (
  • 3Environmental Systems Science, ETH Zurich, Zurich, Switzerland (

Previous studies inferred a missing sink of carbonyl sulfide (COS) in high Northern latitudes. Boreal COS budgets, however, typically account solely for the contribution by forests and ignore any uptake that widespread wetland ecosystems may contribute. Here we present the first direct measurements of the ecosystem-atmosphere COS exchange of a boreal wetland and compare this with a needleleaf forest ecosystems. We then use these data to up-scale to the boreal region.

We found that the investigated wetland was a stable sink for COS during the vegetation period, taking up on average of 10 pmol m−2s−1COS. While this was just 64% of the forest COS uptake, upscaling to the boreal region using the ORCHIDEE land surface model revealed that the Northern wetland sink, c. 20 GgS/y, was on the same order of magnitude compared to the forest COS sink. Our results thus indicate that northern COS should not neglect contributions by wetland ecosystems.

How to cite: de Vries, A., Wohlfahrt, G., Vesala, T., and Kohonen, K.-M.: On the contribution of boreal wetlands to the Northern Hemisphere carbonyl sulfide sink, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-1257,, 2024.