Methane bubbles in Arctic seas stir warming fears

OSLO Fri Mar 5, 2010 12:52am IST

Related Topics

OSLO (Reuters) - Large amounts of a powerful greenhouse gas are bubbling up from a long-frozen seabed north of Siberia, raising fears of far bigger leaks that could stoke global warming, scientists said.

It was unclear, however, if the Arctic emissions of methane gas were new or had been going on unnoticed for centuries -- since before the Industrial Revolution of the 18th century led to wide use of fossil fuels that are blamed for climate change.

The study said about 8 million tonnes of methane a year, equivalent to the annual total previously estimated from all of the world's oceans, were seeping from vast stores long trapped under permafrost below the seabed north of Russia.

"Subsea permafrost is losing its ability to be an impermeable cap," Natalia Shakhova, a scientist at the University of Fairbanks, Alaska, said in a statement. She co-led the study published in Friday's edition of the journal Science.

The experts measured levels of methane, a gas that can be released by rotting vegetation, in water and air at 5,000 sites on the East Siberian Arctic Shelf from 2003-08. In some places, methane was bubbling up from the seabed.

Previously, the sea floor had been considered an impermeable barrier sealing methane, Shakhova said. Current methane concentrations in the Arctic are the highest in 400,000 years.

GLOBAL WARMING

"No one can answer this question," she said of whether the venting was caused by global warming or by natural factors. But a projected rise in temperatures could quicken the thaw.

"It's good that these emissions are documented. But you cannot say they're increasing," Martin Heimann, an expert at the Max Planck Institute for Biogeochemistry in Germany who wrote a separate article on methane in Science, told Reuters.

"These leaks could have been occurring all the time" since the last Ice Age 10,000 years ago, he said. He wrote that the release of 8 million tonnes of methane a year was "negligible" compared to global emissions of about 440 million tonnes.

Shakhova's study said there was an "urgent need" to monitor the region for possible future changes since permafrost traps vast amounts of methane, the second most common greenhouse gas from human activities after carbon dioxide.

Monitoring could resolve if the venting was "a steadily ongoing phenomenon or signals the start of a more massive release period," according to the scientists, based at U.S., Russian and Swedish research institutions.

The release of just a "small fraction of the methane held in (the) East Siberian Arctic Shelf sediments could trigger abrupt climate warming," they wrote.

The shelf has sometimes been above sea level during the earth's history. When submerged, temperatures rise by 12-17 degrees Celsius (22-31 F) since water is warmer than air. Over thousands of years, that may thaw submerged permafrost.

About 60 percent of methane now comes from human activities such as landfills, cattle rearing or rice paddies. Natural sources such as wetlands make up the rest, along with poorly understood sources such as the oceans, wildfires or termites.

Most studies about methane focus on permafrost on land. But the shelf below the Laptev, East Siberian and Russian part of the Chuckchi sea is three times the size of Siberia's wetlands.

(Editing by Janet Lawrence)

(For Reuters latest environment blogs, click on: blogs.reuters.com/environment/)

FILED UNDER:
Comments (0)
This discussion is now closed. We welcome comments on our articles for a limited period after their publication.

  • Most Popular
  • Most Shared

GAZA VIOLENCE

WORLD SHOWCASE

MH17 Probe

MH17 Probe

Fighting complicates Ukraine crash probe, U.S., EU prepare Russia sanctions.  Full Article 

Diplomats' Return

Diplomats' Return

U.S. diplomats' return to Libya could be more hazardous than exit.  Full Article 

Ferry Disaster

Ferry Disaster

Associate of dead S.Korea ferry boss arrested, children due to give evidence.  Full Article 

Chinese in Iraq

Chinese in Iraq

China says may have citizens fighting in Iraq.  Full Article 

Ukraine Crisis

Ukraine Crisis

Russia says Lavrov, Kerry agree on need for swift ceasefire in Ukraine.  Full Article 

Asylum Seekers

Asylum Seekers

Sri Lankan Asylum Seekers arrive in Australia after weeks held at sea  Full Article 

Disputed Waters

Disputed Waters

Battered and broke, Vietnam fishermen bear brunt of China row.  Full Article 

Reuters India Mobile

Reuters India Mobile

Get the latest news on the go. Visit Reuters India on your mobile device.  Full Coverage