22 Feb 2013:
A 1.5 C Temperature Rise Could
Release Greenhouse Gases in Permafrost
A global temperature increase of 1.5 degrees Celsius could unleash more than 1,000 gigatons of carbon and methane
currently trapped beneath Siberian permafrost and accelerate global climate change, a new study says. In a study conducted in a frozen cave in Siberia, researchers analyzed stalactites and
stalagmites which, since they form only when rainwater and snowmelt drip into the caves, provide a glimpse into 500,000 years of changing permafrost conditions. According to their findings, records of an especially warm period 400,000 years ago suggest that a 1.5-degree increase compared to current temperatures would trigger the thawing of permafrost far north of its existing southern boundary. And since permafrost covers 24 percent of the exposed land surface in the Northern Hemisphere, significant thawing could release huge amounts of methane and carbon dioxide, said Anton Vaks, a scientist at Oxford University and lead researcher on the study, published in Science Express
. In addition to the effects the loss of permafrost could have on climate, it could also have major regional implications, affecting roadways, railroads, and natural gas facilities built atop the frozen landscape. A 2012 study estimated that permafrost regions cover about 22 million square kilometers worldwide
, including vast regions of Siberia, Central Asia, and the Himalayas.
Yale Environment 360 is
a publication of the
Yale School of Forestry
& Environmental Studies
Yale Environment 360
articles are now available in Spanish and Portuguese on Universia
, the online educational network. Visit the site.
Business & Innovation
Policy & Politics
Pollution & Health
Science & Technology
Antarctica and the Arctic
Central & South America
Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s unspoiled coral reefs. View the gallery.
is now available for mobile devices at e360.yale.edu/mobile
The Warriors of Qiugang
, a Yale Environment 360
video, chronicles a Chinese village’s fight against a polluting chemical plant. It was nominated for a 2011 Academy Award for Best Documentary Short.
Watch the video.
Top Image: aerial view of Iceland
. © Google & TerraMetrics.
A three-part series Tainted Harvest
looks at the soil pollution crisis in China, the threat it poses to the food supply, and the complexity of any cleanup. Read the series.