04 Jun 2012:
Rapid Greening of Tundra
Discovered in Large Area of West Siberia
Across a large area of western Siberia, shrubs are rapidly growing into trees more than six feet tall
, a process that is expected to further increase temperatures in this rapidly warming part of the Arctic, according to a new study. Relying on satellite images and fieldwork, scientists from Oxford
University and Finland found that in 8 to 15 percent of a 36,000-square-mile region in western Siberia, willow and alder shrubs had turned into trees over the last 30 to 40 years as temperatures have climbed. Oxford scientists said their research showed that the growth of shrubs could be an even more important factor in the greening of the tundra than the migration of trees northward from the boreal forest. The rapid growth of trees is expected to further warm the Arctic for two reasons. In the Arctic spring and autumn, shrubs are often buried under snow, but trees grow above the snow, their dark surfaces absorbing sunlight. In addition, trees create a microclimate that traps heat. “The speed and magnitude of the observed change is far greater than we expected,” said Bruce Forbes of the Arctic Center at the University of Lapland and a co-author of the paper, published in the journal Nature Climate Change
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 coral reefs, which are largely intact thanks to stifled coastal development in the communist nation. 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.