Climate-forced changes in available energy and methane bubbling from subarctic lakes
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 42, no 6, 1936-1942 p.Article in journal (Refereed) Published
Strong correlations between seasonal energy input and methane (CH4) bubbling (ebullition) in northern lakes suggest that energy proxies might provide a constraint on the magnitude of future CH4 emissions. Ebullition is a major pathway for transporting anaerobically produced CH4 from lake sediments to the atmosphere and represents a large unquantified CH4 source. In high-latitude, postglacial lakes during the ice-free season, solar shortwave energy input can constrain CH4 productivity via control of sediment temperature. Utilizing long-term climatic predictors, we calculate CH4 ebullition from three subarctic lakes in northern Sweden over the period of 1916-2079. Using observed energy trends, the seasonal average lake CH4 ebullition is predicted to increase by 80% between the 1916-1926 decade and the 2040-2079 period. Present-day seasonal average methane ebullition is estimated to have already increased 24% since the 1916-1926 decade.
Place, publisher, year, edition, pages
2015. Vol. 42, no 6, 1936-1942 p.
methane, subarctic, lakes, Stordalen, Abisko, shortwave
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-117508DOI: 10.1002/2015GL063189ISI: 000353170000041OAI: oai:DiVA.org:su-117508DiVA: diva2:812922