Contribution of winter to the annual CH₄ emission from a eutrophied boreal lake

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• 作者：Huttunen ; Jari T. ; Alm ; Jukka ; Saarij&auml ; rvi ; Erkki ; Matti Lappalainen ; K. ; Silvola ; Jouko ; et. al.
• 关键词：Dissolved greenhouse gases ; Ebullition ; Eutrophication ; Freshwater ; Ice cover ; Oxygen depletion
• 刊名：Chemosphere
• 出版年：2003
• 期刊代码：15_00456535
• 类别：env
• 出版时间：January, 2003
• 卷：50
• 期：2
• 页码：247-250
• 文件大小：74.7 K

摘要

The springtime methane (CH₄) emission from a small, eutrophied boreal lake was assessed during the winter ice-cover by measurement of gas ebullition and CH₄ accumulation in the water column in association with the development of oxygen depletion after ice formation. The winter CH₄ production was estimated to result in a loss of 3.6–7.9 g CH₄m⁻² from the lake to the atmosphere during the short period of ice melt. This could account for 22–48%of the annual CH₄ emission from the pelagic zone of the lake. The contribution of winter to the annual CH₄ release can be similar or even higher in seasonally ice-covered northern aquatic ecosystems than in northern terrestrial wetlands, thus winter must be considered in any studies into the aquatic CH₄ emissions. The trophic state and wintertime oxygen conditions, linked to the changes in land-use in the catchments and climate, are important factors controlling the springtime lake CH₄ emissions.