Thursday, June 30, 2016

The Ozone Hole Is Finally Healing

I hadn't realized it hadn't already, but The Ozone Hole Is Finally Healing

Nearly thirty years after an international treaty banned the use of chlorofluorocarbons, the Antarctic ozone hole is finally starting to heal. By mid to late century, it should be fully recovered.

Scientists have been monitoring the Antarctic ozone hole, which opens every year in late August or early September and reaches its full size by October, since the 1980s. The size of the ozone hole varies widely from year to year, because the chemical reactions that destroy ozone are highly sensitive to changes in sunlight, temperature, and stratospheric cloud cover. For researchers interested in tracking ozone recovery, the challenge lies in pulling a faint signal out of a noisy background.

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