03 Oct '11, 7pm

That hole in ozone layer above the Arctic? In 2011, it grew to the biggest size that scientists have ever recorded.

That hole in ozone layer above the Arctic? In 2011, it grew to the biggest size that scientists have ever recorded.

To investigate the 2011 Arctic ozone loss, scientists from 19 institutions in nine countries (United States, Germany, The Netherlands, Canada, Russia, Finland, Denmark, Japan and Spain) analyzed a comprehensive set of measurements. These included daily global observations of trace gases and clouds from NASA's Aura and CALIPSO spacecraft; ozone measured by instrumented balloons; meteorological data and atmospheric models. The scientists found that at some altitudes, the cold period in the Arctic lasted more than 30 days longer in 2011 than in any previously studied Arctic winter, leading to the unprecedented ozone loss. Further studies are needed to determine what factors caused the cold period to last so long. [...] The 2011 Arctic ozone loss occurred over an area considerably smaller than that of the Antarctic ozone holes. This is because the Arctic polar vortex, a persis...

Full article: http://www.treehugger.com/files/2011/10/2011-arctic-ozone...

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Arctic ozone hole is largest ever recorded

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