Change search
ReferencesLink to record
Permanent link

Direct link
Bubbles trapped in arctic lake ice: Potential implications for methane emissions
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Show others and affiliations
2011 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 116, G03044- p.Article in journal (Refereed) Published
Abstract [en]

The amount of methane (CH(4)) emitted from northern lakes to the atmosphere is uncertain but is expected to increase as a result of arctic warming. A majority of CH4 is thought to be released through ebullition (bubbling), a pathway with extreme spatial variability that limits the accuracy of measurements. We assessed ebullition during early and late winter by quantifying bubbles trapped in the ice cover of two lakes in a landscape with degrading permafrost in arctic Sweden using random transect sampling and a digital image processing technique. Bubbles covered up to similar to 8% of the lake area and were largely dominated by point source emissions with spatial variabilities of up to 1056%. Bubble occurrence differed significantly between early and late season ice, between the two lakes and among different zones within each lake (p < 0.001). Using a common method, we calculated winter fluxes of up to 129 +/- 486 mg CH(4) m(-2) d(-1). These calculations are, on average, two times higher than estimates from North Siberian and Alaskan lakes and four times higher than emissions measured from the same lakes during summer. Therefore, the calculations are likely overestimates and point to the likelihood that estimating CH(4) fluxes from ice bubble distributions may be more difficult than believed. This study also shows that bubbles quantified using few transects will most likely be unsuitable in making large-scale flux estimates. At least 19 transects covering similar to 1% of the lake area were required to examine ebullition with high precision in our studied lakes.

Place, publisher, year, edition, pages
2011. Vol. 116, G03044- p.
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-66529DOI: 10.1029/2011JG001761ISI: 000295531100002OAI: diva2:469818
authorCount :5Available from: 2011-12-27 Created: 2011-12-20 Last updated: 2011-12-27Bibliographically approved

Open Access in DiVA

fulltext(1783 kB)468 downloads
File information
File name FULLTEXT01.pdfFile size 1783 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Wik, MartinCrill, Patrick M.
By organisation
Department of Geological Sciences
In the same journal
Journal of Geophysical Research
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 468 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 42 hits
ReferencesLink to record
Permanent link

Direct link