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

Preview

Text spatial heterogeneity.pdf - Published Version Available under License Publisher holds Copyright. Publisher's version/PDF must be used in Institutional Repository 6 months after publication. Download (431kB) | Preview

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.

Interest & Impact

Downloads

283 since deposited on 17 Feb 2014
39 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item