Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes

Schilder, Johannes Cornelis; Bastviken, David; van Hardenbroek, Maarten Reinier; Kankaala, Paula; Rinta, Päivi Johanna; Stötter, Tabea; Heiri, Oliver (2013). Spatial heterogeneity and lake morphology affect diffusive greenhouse gas emission estimates of lakes. Geophysical Research Letters, 40(21), pp. 5752-5756. American Geophysical Union 10.1002/2013GL057669

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

Graduate School:

Graduate School of Climate Sciences

UniBE Contributor:

Schilder, Johannes Cornelis; van Hardenbroek, Maarten Reinier; Rinta, Päivi Johanna; Stötter, Tabea and Heiri, Oliver

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0094-8276

Publisher:

American Geophysical Union

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

17 Feb 2014 10:17

Last Modified:

18 Sep 2015 15:00

Publisher DOI:

10.1002/2013GL057669

Uncontrolled Keywords:

methane emission, carbon dioxide emission, lakes, greenhouse gases, diffusive flux

BORIS DOI:

10.7892/boris.40906

URI:

https://boris.unibe.ch/id/eprint/40906

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