BBC News 14 Jan 10;
Rising temperatures are not just a sign of climate change but are also a cause of it, a new study has suggested.
Higher temperatures on the surface of the earth are fuelling a further increase in emissions of methane, Edinburgh University experts found.
Methane is a greenhouse gas which is more potent than carbon dioxide.
The study indicated warmer temperatures in regions which were at higher latitudes increased methane - exacerbating global warming.
Scientists studying atmospheric levels of methane from the world's largest source of the gas, wetlands such as paddy fields, marshes and bogs, found that emissions were increasing in line with rising temperatures.
Researchers used satellite measurements of the atmospheric concentration of methane as well as data relating to surface temperature changes and variations in surface water to work out the levels of wetland emissions of methane from different regions.
The results showed that output from wetlands increased 7% between 2003 and 2007.
The findings also showed which regional wetland emissions were most sensitive to changes in flooding and extreme temperatures, which could help scientists predict future climate change.
Professor Paul Palmer of Edinburgh University's school of geosciences, who supervised the study, said: "These findings highlight the compound effect of increasing global warming - higher temperatures lead to faster warming.
"Our study reinforces the idea that satellites can pinpoint changes in the amount of greenhouse gases emitted from a particular place on earth.
"This opens the door to quantifying greenhouse gas emissions made from a variety of natural and man-made sources."
The study was funded by the Natural Environment Research Council and was carried out in collaboration with the Netherlands Institute for Space research. Data was supplied by Nasa and the European Space Agency.
The University of Edinburgh PhD study is published in Science.
Arctic permafrost leaking methane at record levels, figures show
Experts say methane emissions from the Arctic have risen by almost one-third in just five years, and that sharply rising temperatures are to blame
David Adam, guardian.co.uk 14 Jan 10;
Scientists have recorded a massive spike in the amount of a powerful greenhouse gas seeping from Arctic permafrost, in a discovery that highlights the risks of a dangerous climate tipping point.
Experts say methane emissions from the Arctic have risen by almost one-third in just five years, and that sharply rising temperatures are to blame.
The discovery follows a string of reports from the region in recent years that previously frozen boggy soils are melting and releasing methane in greater quantities. Such Arctic soils currently lock away billions of tonnes of methane, a far more potent greenhouse gas than carbon dioxide, leading some scientists to describe melting permafrost as a ticking time bomb that could overwhelm efforts to tackle climate change.
They fear the warming caused by increased methane emissions will itself release yet more methane and lock the region into a destructive cycle that forces temperatures to rise faster than predicted.
Paul Palmer, a scientist at Edinburgh University who worked on the new study, said: "High latitude wetlands are currently only a small source of methane but for these emissions to increase by a third in just five years is very significant. It shows that even a relatively small amount of warming can cause a large increase in the amount of methane emissions."
Global warming is occuring twice as fast in the Arctic than anywhere else on Earth. Some regions have already warmed by 2.5C, and temperatures there are projected to increase by more than 10C by 2100 if carbon emissions continue to rise at current rates.
Palmer said: "This study does not show the Arctic has passed a tipping point, but it should open people's eyes. It shows there is a positive feedback and that higher temperatures bring higher emissions and faster warming."
The change in the Arctic is enough to explain a recent increase in global methane levels in the atmosphere, he said. Global levels have risen steadily since 2007, after a decade or so holding steady.
The new study, published in the journal Science, shows that methane emissions from the Arctic increased by 31% from 2003-07. The increase represents about 1m extra tonnes of methane each year. Palmer cautioned that the five-year increase was too short to call a definitive trend.
The findings are part of a wider study of methane emissions from global wetlands, such as paddy fields, marshes and bogs. To identify where methane was released, the researchers combined methane levels in the atmosphere with surface temperature changes. They did not measure methane emissions directly, but used satellite measurements of variations in groundwater depth, which alter the way bacteria break down organic matter to release or consume methane.
They found that just over half of all methane emissions came from the tropics, with some 20m tonnes released from the Amazon river basin each year, and 26m tonnes from the Congo basin. Rice paddy fields across China and south and south-east Asia produced just under one-third of global methane, some 33m tonnes. Just 2% of global methane comes from Arctic latitudes, the study found, though the region showed the largest increases. The 31% rise in methane emissions there from 2003-07 was enough to help lift the global average increase to 7%.
Palmer said: "Our study reinforces the idea that satellites can pinpoint changes in the amount of greenhouse gases emitted from a particular place on earth. This opens the door to quantifying greenhouse gas emissions made from a variety of natural and man-made sources."
Palmer said it was a "disgrace" that so few satellites were launched to monitor levels of greenhouse gases such as carbon dioxide and methane. He said it was unclear whether the team would be able to continue the methane monitoring in future. The pair of satellites used to analyse water, known as Grace, are already over their expected mission life time, while a European version launched last year, called Goce, is scheduled to fly for less than two years.
The new study follows repeated warnings that even modest levels of global warming could trigger huge increases in methane release from permafrost. Phillipe Ciais, a researcher with the Laboratory for Climate Sciences and the Environment in Gif-sur-Yvette, France, told a scientific meeting in Copenhagen last March that billions of tonnes could be released by just a 2C average global rise.
More on methane
While carbon dioxide gets most of the attention in the global warming debate, methane is pound-for-pound a more potent greenhouse gas, capable of trapping some 20 times more heat than CO2. Although methane is present in much lower quantities in the atmosphere, its potency makes it responsible for about one-fifth of man-made warming.
The gas is found in natural gas deposits and is generated naturally by bacteria that break down organic matter, such as in the guts of farm animal. About two-thirds of global methane comes from man-made sources, and levels have more than doubled since the industrial revolution.
Unlike carbon dioxide, methane lasts only a decade or so in the atmosphere, which has led some experts to call for greater attention to curbs on its production. Reductions in methane emissions could bring faster results in the fight against climate change, they say.
