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| Titel |
Inversion model estimates of methane emissions from northern wetlands during soil freezing period |
| VerfasserIn |
Tuula Aalto, Aki Tsuruta, Vilma Kangasaho, Kimmo Rautiainen, Leif Backman, Ingrid van der Laan-Luijkx, Maarten Krol, Renato Spahni, Sebastian Lienert, Edward Dlugokencky, Tuomas Laurila, Juha Hatakka, Doug Worthy, Motoki Sasakawa, Olli Peltola, Aleksanteri Mauranen, Martin Heimann, Lena Kozlova, Andrew Crotwell, Wouter Peters |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148700
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| Publikation (Nr.) |
 EGU/EGU2017-12980.pdf |
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| Zusammenfassung |
| The northern wetland methane emissions continue throughout the autumn season, and the transition period when subsurface soil temperatures are near freezing may significantly contribute to the annual biospheric methane budget. Methane fluxes at northern latitudes were estimated with Carbon Tracker Europe – CH4 (CTE-CH4) atmospheric inversion model, optimizing separately for anthropogenic and biospheric fluxes. The results were combined with top-soil freeze data from satellite (SMOS) to quantify the late autumn season biospheric emissions and find out whether they continue throughout the period when the soil freezes. The enhanced in situ observation network at northern latitudes enables spatially better resolved flux estimates. Fluxes were solved in weekly time resolution, enabling the follow-up of soil freeze development. Generally, the methane emissions continued throughout the transition period until complete top-soil freeze, and there was a positive correlation between the magnitude of the emissions and the length of the transition period. |
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