Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes
Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes
Most estimates of diffusive flux (F) of methane (CH4) and carbon dioxide (CO2) from lakes are based on single-point flux chamber measurements or on piston velocity (k) modeled from wind speed and single-point measurements of surface water gas concentrations (Caq). We analyzed spatial variability of F of CH4 and CO2, as well as Caq and k in 22 European lakes during late summer. F and k were higher in the lake centers, leading to considerable bias when extrapolating single-point chamber measurements to whole-lake estimates. The ratio of our empirical k estimates to wind speed-modeled k was related to lake size and shape, suggesting a lake morphology effect on the relationship between wind speed and k. This indicates that the error inherent to established wind speed models can be reduced by determining k and Caq at multiple sites on lakes to calibrate wind speed-modeled k to the local system.
5752-5756
Schilder, Jos
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Bastviken, David
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van Hardenbroek, Maarten
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Kankaala, Paula
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Rinta, Päivi
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Stötter, Tabea
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Heiri, Oliver
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December 2013
Schilder, Jos
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Bastviken, David
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van Hardenbroek, Maarten
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Kankaala, Paula
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Rinta, Päivi
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Stötter, Tabea
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Heiri, Oliver
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Schilder, Jos, Bastviken, David, van Hardenbroek, Maarten, Kankaala, Paula, Rinta, Päivi, Stötter, Tabea and Heiri, Oliver
(2013)
Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes.
Geophysical Research Letters, 40 (21), .
(doi:10.1002/2013GL057669).
Abstract
Most estimates of diffusive flux (F) of methane (CH4) and carbon dioxide (CO2) from lakes are based on single-point flux chamber measurements or on piston velocity (k) modeled from wind speed and single-point measurements of surface water gas concentrations (Caq). We analyzed spatial variability of F of CH4 and CO2, as well as Caq and k in 22 European lakes during late summer. F and k were higher in the lake centers, leading to considerable bias when extrapolating single-point chamber measurements to whole-lake estimates. The ratio of our empirical k estimates to wind speed-modeled k was related to lake size and shape, suggesting a lake morphology effect on the relationship between wind speed and k. This indicates that the error inherent to established wind speed models can be reduced by determining k and Caq at multiple sites on lakes to calibrate wind speed-modeled k to the local system.
Text
Schilder et al 2013 spatial CH4 flux.pdf
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Accepted/In Press date: 22 October 2013
e-pub ahead of print date: 13 November 2013
Published date: December 2013
Organisations:
Palaeoenvironment Laboratory (PLUS)
Identifiers
Local EPrints ID: 378297
URI: http://eprints.soton.ac.uk/id/eprint/378297
ISSN: 0094-8276
PURE UUID: 145f52b9-a995-4e3f-a98f-21c10c827beb
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Date deposited: 30 Jun 2015 12:44
Last modified: 14 Mar 2024 20:20
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Contributors
Author:
Jos Schilder
Author:
David Bastviken
Author:
Maarten van Hardenbroek
Author:
Paula Kankaala
Author:
Päivi Rinta
Author:
Tabea Stötter
Author:
Oliver Heiri
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