2012-10-24. 2012 Antarctic Ozone Hole Second Smallest in 20 Years

posted Oct 26, 2012, 3:49 PM by Lisa Ou
 | by Steve Cole and Katy Human, The NY Times. An article relevant to GSS Ozone chapter 9. Excerpt:  WASHINGTON -- The average area covered by the Antarctic ozone hole this year was the second smallest in the last 20 years, according to data from NASA and National Oceanic and Atmospheric Administration (NOAA) satellites. Scientists attribute the change to warmer temperatures in the Antarctic lower stratosphere…This year also showed a change in the concentration of ozone over the Antarctic. The minimum value of total ozone in the ozone hole was the second highest level in two decades. Total ozone, measured in Dobson units (DU), reached 124 DU on Oct. 1. NOAA ground-based measurements at the South Pole recorded 136 DU on Oct. 5. When the ozone hole is not present, total ozone typically ranges from 240-500 DU. …Read the full article: http://www.nasa.gov/home/hqnews/2012/oct/HQ_12-371_2012_Ozone_Hole.html