30 Oct '14, 4pm

It's cold #chemistry! How the extent of the Antarctic #ozone hole is influenced by cold temps: http…

It's cold #chemistry! How the extent of the Antarctic #ozone hole is influenced by cold temps: http…

The Antarctic ozone hole did not cause global warming . But there is a connection between climate and the annual thin spot that forms each spring in Earth’s UV-blocking ozone layer: colder winter temperatures tend to lead to larger ozone holes. The maps at right demonstrate the general connection. The top map shows the average stratospheric ozone concentration from September 8-14, the week when NOAA measurements indicate that ozone hole reached its largest extent for the year. The colors change to red where ozone amounts were less than 220 Dobson Units—the threshold for the ozone hole. The bottom map shows the stratospheric temperature in August (mid- to late winter in the Southern Hemisphere.) Places where temperatures were -78°C or colder are shown in shades of blue. Comparing the two maps, it’s evident that the lowest ozone concentrations are generally where the late wi...

Full article: http://www.climate.gov/news-features/featured-images/cold...

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