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Date
2019Type
- Data Collection
ETH Bibliography
yes
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Abstract
Many seasonally stratified lakes accumulate substantial amounts of the greenhouse gas methane in the anoxic zone. Methane oxidizing bacteria in the water column act as a converter, oxidizing methane into carbon dioxide and biomass before it reaches the atmosphere. Current observations and estimates of this methane oxidation efficiency are diverging, especially for the lake overturn period. Here we combine a model of turbulent mixing, gas exchange and microbial growth with a comprehensive data set for autumn mixing to quantify the relevant physical and microbial processes. We show that the microbial methane converter is effectively transforming the increased methane flux during the overturn period. Only rare events of pronounced surface cooling in combination with persistently strong wind can trigger substantial outgassing. In the context of climate change, these results suggest that changes in the frequency of storms may be even more important for methane emissions from temperate lakes than gradual warming. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000350091Contributors
Contact person: Zimmermann, Matthias
Data collector: Zimmermann, Matthias
Data collector: Mayr, Magdalena J.
Data collector: Beck, Karin
Data collector: Brand, Andreas
Data collector: Steinsberger, Thomas
Data collector: Eugster, Werner
Data collector: Dinkel, Christian
Data collector: Plüss, Michael
Data collector: Schurter, Michael
Producer: Zimmermann, Matthias
Project leader: Bürgmann, Helmut
Project member: Zimmermann, Matthias
Project member: Mayr, Magdalena J.
Project member: Bürgmann, Helmut
Project member: Wehrli, Bernhard
Project member: Bouffard, Damien
Project member: Brand, Andreas
Publisher
ETH ZurichGeographic location
Place nameLake RotseePoint coordinatesLatitude: 47.0705Longitude: 8.3157
Date collected
2016-10-01/2017-02-01Organisational unit
03328 - Wehrli, Bernhard (emeritus) / Wehrli, Bernhard (emeritus)
Related publications and datasets
Is supplement to: https://doi.org/10.1101/689182
Is supplemented by: https://doi.org/10.5905/ethz-1007-207
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