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Politics : Canadian Political Free-for-All -- Ignore unavailable to you. Want to Upgrade?


To: Land Shark who wrote (11614)3/15/2007 2:27:29 AM
From: Id_Jit  Read Replies (1) | Respond to of 37056
 
It was real and still exists. … CFC emmissions globally have since gone down significantly. Now the hole is closing.

Situation at 2007 February 28
Ozone levels across Antarctica dropped rapidly in September and were generally at their minimum in early October. The ozone hole grew rapidly from mid August and reached nearly 28 million square kilometres in size at the equinox. The ozone hole was at record or near record size from mid September until late November, when it began to decline rapidly. The ozone hole persisted until early December. Although not an absolute record in size it was a record for the amount of ozone destroyed.

More at: antarctica.ac.uk

Yes, now the “hole” is closing over the Antarctic, but it will be there again the same time next year. Get ready for the news reports that the Arctic “hole” is growing. It’s the time of the season. I dislike the term “hole”. It implies a total void of ozone.

Ozone is an unstable molecule. Ozone in the stratosphere is mostly produced from ultraviolet rays reacting with oxygen. During “Winter” conditions at the north and south poles, there is very little sunlight at that altitude. What little sunlight there is has to pass obliquely through much more air because of the earth’s tilt.

That is an extremely simple explanation. Yes, there are many more factors that contribute to the forming of the “holes”, but I like simplicity.

Skeptically,
Id