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Large, increasing methane emissions from northern lakes

Date:
January 4, 2016
Source:
Stockholm University
Summary:
Climate-sensitive regions in the north are home to most of the world's lakes. New research shows that these northern freshwaters are critical emitters of methane, a more effective greenhouse gas than carbon dioxide.
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These are post-glacial lakes in Stordalen, northern Sweden.
Credit: Jo Uhlbäck

Methane is increasing in the atmosphere, but many sources are poorly understood. Lakes at high northern latitudes are such a source. However, this may change with a new study published in Nature Geoscience. By compiling previously reported measurements made at a total of 733 northern water bodies -- from small ponds formed by beavers to large lakes formed by permafrost thaw or ice-sheets -- researchers are able to more accurately estimate emissions over large scales.

"The release of methane from northern lakes and ponds needs to be taken seriously. These waters are significant, contemporary sources because they cover large parts of the landscape. They are also likely to emit even more methane in the future," says Martin Wik, PhD student at the Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University, who led the study.

With climate warming, particularly at high northern latitudes, longer ice-free seasons in combination with permafrost thaw is likely to fuel methane release from lakes, potentially causing their emissions to increase 20-50 precent before the end of this century. Such a change would likely generate a positive feedback on future warming, causing emissions to increase even further.

"This means that efforts to reduce human induced warming are even more urgent in order to minimize this type of feedback of natural greenhouse gas emissions. In a sense, every reduction in emissions from fossil fuels is a double victory," says David Bastviken, Professor at Tema Environmental Change, Linköping University.


Story Source:

The above post is reprinted from materials provided by Stockholm University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Martin Wik, Ruth K. Varner, Katey Walter Anthony, Sally MacIntyre, David Bastviken. Climate-sensitive northern lakes and ponds are critical components of methane release. Nature Geoscience, 2016; DOI: 10.1038/ngeo2578

Cite This Page:

Stockholm University. "Large, increasing methane emissions from northern lakes." ScienceDaily. ScienceDaily, 4 January 2016. <www.sciencedaily.com/releases/2016/01/160104130423.htm>.
Stockholm University. (2016, January 4). Large, increasing methane emissions from northern lakes. ScienceDaily. Retrieved July 25, 2016 from www.sciencedaily.com/releases/2016/01/160104130423.htm
Stockholm University. "Large, increasing methane emissions from northern lakes." ScienceDaily. www.sciencedaily.com/releases/2016/01/160104130423.htm (accessed July 25, 2016).

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