Warming ponds could accelerate climate change

https://phys.org/news/2017-02-ponds-climate.html

February 20, 2017
Warming ponds could accelerate climate change
Ponds used in the experiment. Credit: University of Exeter

Rising temperatures could accelerate climate change by reducing the amount of carbon dioxide stored in ponds and increasing the methane they release, new research shows.

The scientists experimentally warmed an array of over seven years by 4-5ºC and studied the impacts on and rates of metabolism.

Changes observed after the first year became “amplified” over a longer period, according to the study by the University of Exeter and Queen Mary University of London

After seven years, a pond’s ability to absorb carbon dioxide (CO2) was reduced by almost half, while release almost doubled.

Lakes and ponds cover about 4% of Earth’s surface (excluding areas covered by glaciers and ice sheets) but they are disproportionately large sources of methane and CO2 to the atmosphere.

Ponds of less than one square metre are responsible for releasing about 40% of all methane emissions from inland waters.

“This is the first experiment to investigate the long-term effects of warming in aquatic ecosystems,” said lead author Professor Gabriel Yvon-Durocher, of the Environment and Sustainability Institute on the University of Exeter’s Penryn Campus in Cornwall.

“Given the substantial contribution small ponds make to the emission of greenhouse gases, it is vital to understand how they might respond to .

“Our findings show that warming can fundamentally alter the carbon balance of small ponds over a number of years, reducing their capacity to absorb and increasing emissions of methane.

“This could ultimately accelerate climate change.”

Such effects are known as “positive feedbacks” – where the effects of global warming on components of the biosphere lead to changes that further climate change.

“The amplified effects of experimental warming we have observed in ponds are different to those we typically see on land, where large initial effects of warming appear to diminish over the long term,” Professor Yvon-Durocher said.

“This accelerating effect in ponds, which could have serious impacts on , is not currently accounted for in Intergovernmental Panel on Climate Change models.”

The paper, entitled “Long-term warming amplifies shifts in the carbon cycle of experimental ponds”, is published in the journal Nature Climate Change.

Explore further: Global warming may increase methane emissions from freshwater ecosystems

More information: Long-term warming amplifies shifts in the carbon cycle of experimental ponds, Nature Climate Change, nature.com/articles/doi:10.1038/nclimate3229

Read more at: https://phys.org/news/2017-02-ponds-climate.html#jCp

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2 thoughts on “Warming ponds could accelerate climate change

  1. So then, looks like, there we have it again. They say “the greatest mass extinction is the Permian, 251 million years, when 96% of species were lost.” The scientist found evidence that it was caused by extreme greenhouse effect that in turn warmed up the deep ocean water to the point that frozen methane started bubbling up to the surface and exacerbated the greenhouse problem. And yes, that will happen if the temperature of the deep ocean becomes just a few degrees higher. A new study places the problem still with methane while saying, it was caused by a population explosion of a greenhouse loving methane belching bacterial. Whatever caused the methane to get into the atmosphere, you can bet, that we have been providing the conditions for it to happen again.

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