24 Mar 2011:
Low Arctic Winter Ice;
Polar Region Experiences Ozone Loss
The maximum extent of winter sea ice in the Arctic, reached earlier this month, tied for the lowest maximum ever measured
, according to the National Snow and Ice Data Center (NSIDC) at the
Click to enlarge
National Snow and Ice Data Center
Arctic sea ice extent, March, 2011
University of Colorado. This year, maximum sea ice extent in the Arctic reached 5.65 million square miles, roughly 460,000 square miles below the 1979 to 2000 average. That maximum matches the previous record low maximum, set in 2006. Walt Meier, a research scientist at the NSIDC, said one reason for this year’s lower sea ice maximum is that autumn sea ice growth is increasingly delayed by rising Arctic temperatures, meaning ice extent is not able to “catch up” in winter. Meanwhile, scientists report that protective ozone in the upper layers of the Arctic atmosphere has been reduced by about half this year
and that the Arctic, for the first time in recorded history, may experience an ozone hole similar to the one over the Antarctic. Ozone is destroyed by chlorofluorocarbons and other chemicals, and destruction intensifies as temperatures in the stratosphere decrease. Scientists say that heat trapped at lower levels by greenhouse gases may be making the stratosphere colder. Low-ozone air from the Arctic may drift as far south as New York this spring, possibly increasing risks of skin cancer.
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
Tribal people and ranchers join together to stop a project that would haul coal across their Montana land. Watch the video.
is now available for mobile devices at e360.yale.edu/mobile
The 2015 Yale e360 Video Contest winner documents a Northeastern town's bitter battle over a wind farm. Watch the video.
A 2015 Yale e360 Video Contest winner captures stunning images of wild salmon runs in Alaska. Watch the video.
video series looks at the staggering amount of food wasted in the U.S. – a problem with major human and environmental costs. Watch the video.
video goes onto the front lines with Colorado firefighters confronting deadly blazes fueled by a hotter, drier climate. Watch the video.
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.