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| Titel |
Methane in a Swedish sill fjord - Benthic fluxes, inventory and atmospheric emission |
| VerfasserIn |
Tobias Rütting, Anders Stigebrandt, Loreto de Brabandere, Leif Klemedtsson, Per Hall |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250038975
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| Zusammenfassung |
| Methane (CH4) is a potent greenhouse gas, which has the second largest radiative force after carbon dioxide. Oceans, including their coastal areas, contribute to the natural CH4 budget in the atmosphere, but measurements are still sparse, and no measurements of CH4 in Swedish fjord systems have been made. For this purpose we measured CH4 concentrations in the water column as well as benthic CH4 fluxes by using in-situ chambers on four occasions during 2009. The study area, the By Fjord, is a sill fjord on the Swedish west coast. Benthic flux measurements were done on a depth transect in the fjord and included both sediments with overlying oxic and anoxic water.
The collected data were used to calculate the total fjord integrated net CH4 release from sediments, the transport through the water column, and finally the exchange between water and atmosphere. Moreover, we used modeling to estimate the total CH4 emission to the atmosphere from the By Fjord, which could be used as proxy for similar Scandinavian fjord systems. We will furthermore discuss our findings on CH4 in relation to simultaneous measurements of oxygen, NO3-, Fe, Mn and H2S, and the extent of CH4 oxidation in the water column. The presented results are of special importance even on a European scale, as they fill a gap in CH4 investigations according to a recent review of CH4 in European coastal waters. |
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