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Global warming will be faster than expected

Date:
November 26, 2015
Source:
Linköping Universitet
Summary:
Global warming will progress faster than what was previously believed. The reason is that greenhouse gas emissions that arise naturally are also affected by increased temperatures. This has been confirmed in a new study that measures natural methane emissions.
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Greenhouse gas emissions from the burning of fossil fuels lead to higher temperatures, which in turn lead to increased natural emissions and further warming.
Credit: © josevgluis / Fotolia

Global warming will progress faster than what was previously believed. The reason is that greenhouse gas emissions that arise naturally are also affected by increased temperatures. This has been confirmed in a new study from Linköping University that measures natural methane emissions.

"Everything indicates that global warming caused by humans leads to increased natural greenhouse gas emissions. Our detailed measurements reveal a clear pattern of greater methane emissions from lakes at higher temperatures," says Sivakiruthika Natchimuthu, doctoral student at Tema Environmental Change, Linköping University, Sweden, and lead author of the latest publication on this topic from her group.

Over the past two years the research team at Linköping University has contributed to numerous studies that all point in the same direction: natural greenhouse gas emissions will increase when the climate gets warmer. In the latest study the researchers examined the emissions of the greenhouse gas methane from three lakes. The effects were clear and the methane emissions increased exponentially with temperature. Their measurements show that a temperature increase from 15 to 20 degrees Celsius almost doubled the methane level. The findings was recently published in Limnology and Oceanography.

While increased anthropogenic emissions of greenhouse gases are expected and included in climate predictions, the future development of the natural emissions has been less clear.

Now knowledge of a vicious circle emerge: greenhouse gas emissions from the burning of fossil fuels lead to higher temperatures, which in turn lead to increased natural emissions and further warming.

"We're not talking about hypotheses anymore. The evidence is growing and the results of the detailed studies are surprisingly clear. [DB1] The question is no longer if the natural emissions will increase but rather how much they will increase with warming," says David Bastviken, professor at Tema Environmental Change, Linköping University.

This means that warming will be faster than expected from anthropogenic greenhouse gas emissions alone. According to Professor Bastviken this also means that any reductions in anthropogenic greenhouse emissions is a double victory, by both reducing the direct effect on warming, but also by preventing the feedback with increased natural emissions.


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Materials provided by Linköping Universitet. Note: Content may be edited for style and length.


Journal Reference:

  1. Sivakiruthika Natchimuthu, Ingrid Sundgren, Magnus Gålfalk, Leif Klemedtsson, Patrick Crill, Åsa Danielsson, David Bastviken. Spatio-temporal variability of lake CH4fluxes and its influence on annual whole lake emission estimates. Limnology and Oceanography, 2015; DOI: 10.1002/lno.10222

Cite This Page:

Linköping Universitet. "Global warming will be faster than expected." ScienceDaily. ScienceDaily, 26 November 2015. <www.sciencedaily.com/releases/2015/11/151126104037.htm>.
Linköping Universitet. (2015, November 26). Global warming will be faster than expected. ScienceDaily. Retrieved September 29, 2016 from www.sciencedaily.com/releases/2015/11/151126104037.htm
Linköping Universitet. "Global warming will be faster than expected." ScienceDaily. www.sciencedaily.com/releases/2015/11/151126104037.htm (accessed September 29, 2016).