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Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes
University of Bern, Switzerland .
Linköping University, The Tema Institute, Department of Water and Environmental Studies. Linköping University, Faculty of Arts and Sciences.
University of Bern, Switzerland .
University of Eastern Finland, Finland .
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2013 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 40, no 21, 5752-5756 p.Article in journal (Refereed) Published
Abstract [en]

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 (C-aq). We analyzed spatial variability of F of CH4 and CO2, as well as C-aq 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 C-aq at multiple sites on lakes to calibrate wind speed-modeled k to the local system.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2013. Vol. 40, no 21, 5752-5756 p.
Keyword [en]
methane emission, carbon dioxide emission, lakes, greenhouse gases, diffusive flux
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:liu:diva-102981DOI: 10.1002/2013GL057669ISI: 000327810800034OAI: diva2:685451

Funding Agencies|European Research Council (ERC)|RECONMET 239858|Swedish Research Council (VR)||Swedish Research Council (FORMAS)||

Available from: 2014-01-09 Created: 2014-01-09 Last updated: 2015-03-12

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Bastviken, David
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