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- W4220791881 abstract "<p>Lakes are responsible for substantial emissions of methane (CH<sub>4</sub>) to the atmosphere globally, but their contribution is poorly constrained and current estimates vary widely. One of the reasons for this large uncertainty lies in the practical challenges involved in collecting CH<sub>4</sub> concentration and flux data at the suitable temporal and spatial scales to capture their natural variability. Here, we present the results of an attempt to account for the spatial and temporal variability of CH<sub>4</sub> concentrations and fluxes when deriving whole-lake and yearly average values. We used these average values to investigate the main environmental drivers of CH<sub>4</sub> concentrations in the surface water of lakes and CH<sub>4</sub> emissions from lakes. We made surface water CH<sub>4</sub> concentration and CH<sub>4</sub> fluxes measurements using headspace equilibration and floating chambers, respectively, in a set of boreal lakes located in different parts of Sweden and with various morphological and biogeochemical properties. Measurements covered different periods of the open-water season at multiple locations covering various depths/distances to shore in each lake. Individual CH<sub>4</sub> flux measurements (150-300 measurements per lake) were interpolated based on relationships with local spatial and temporal variables. Relationships between mean open water season CH<sub>4</sub> concentrations and emissions, and one to three independent environmental variables were tested as different models. The results suggest that the frequency and spatial coverage of the measurements is critical for identifying reliable quantitative empirical models of CH<sub>4</sub> concentrations and emissions from lakes.</p>" @default.
- W4220791881 created "2022-04-03" @default.
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- W4220791881 date "2022-03-27" @default.
- W4220791881 modified "2023-09-27" @default.
- W4220791881 title "Evaluating empirical models of lake methane emissions and concentrations in hemiboreal and subarctic regions" @default.
- W4220791881 doi "https://doi.org/10.5194/egusphere-egu22-1794" @default.
- W4220791881 hasPublicationYear "2022" @default.
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