Multiyear measurements of ebullitive methane flux from three subarctic lakes

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Wik, MartinStockholms universitet,Institutionen för geologiska vetenskaper,Stockholm University, Sweden (author)

Multiyear measurements of ebullitive methane flux from three subarctic lakes

Article/chapterEnglish2013

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2013-09-20
American Geophysical Union (AGU),2013
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LIBRIS-ID:oai:DiVA.org:su-96126
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-96126URI
https://doi.org/10.1002/jgrg.20103DOI
https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-100499URI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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AuthorCount:4;
Funding Agencies|Swedish Research Council (VR)||
Ebullition (bubbling) from small lakes and ponds at high latitudes is an important yet unconstrained source of atmospheric methane (CH4). Small water bodies are most abundant in permanently frozen peatlands, and it is speculated that their emissions will increase as the permafrost thaws. We made 6806 measurements of CH4 ebullition during four consecutive summers using a total of 40 bubble traps that were systematically distributed across the depth zones of three lakes in a sporadic permafrost landscape in northernmost Sweden. We identified significant spatial and temporal variations in ebullition and observed a large spread in the bubbles' CH4 concentration, ranging from 0.04% to 98.6%. Ebullition followed lake temperatures, and releases were significantly larger during periods with decreasing atmospheric pressure. Although shallow zone ebullition dominated the seasonal bubble CH4 flux, we found a shift in the depth dependency towards higher fluxes from intermediate and deep zones in early fall. The average daily flux of 13.4mg CH4 m(-2) was lower than those measured in most other high-latitude lakes. Locally, however, our study lakes are a substantial CH4 source; we estimate that 350kg of CH4 is released via ebullition during summer (June-September), which is approximately 40% of total whole year emissions from the nearby peatland. In order to capture the large variability and to accurately scale lake CH4 ebullition temporally and spatially, frequent measurements over long time periods are critical.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng
NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
methane
ebullition
high-latitude lakes
geokemi
Geochemistry

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Crill, Patrick M.Stockholms universitet,Institutionen för geologiska vetenskaper,Stockholm University, Sweden(Swepub:su)pcril (author)
Varner, Ruth K.University of New Hampshire, NH USA (author)
Bastviken, DavidLinköpings universitet,Stockholms universitet,Institutionen för geologiska vetenskaper,Linköping University, Sweden,Tema vatten i natur och samhälle,Filosofiska fakulteten,Stockholm University, Sweden(Swepub:liu)davba48 (author)
Stockholms universitetInstitutionen för geologiska vetenskaper (creator_code:org_t)

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In:Journal of Geophysical Research - Biogeosciences: American Geophysical Union (AGU)118:3, s. 1307-13212169-89532169-8961

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By the author/editor: Wik, Martin; Crill, Patrick M ...; Varner, Ruth K.; Bastviken, David

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Environmental Sc ...

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

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