Sep 22, 2009

Ozone Hole Now Smaller


The World Meteorological Organization (WMO) in Geneva said that the ozone hole is expected to be smaller in 2009 than a year ago. “The meteorological conditions observed so far could indicate that the 2009 ozone hole will be smaller than that of 2006 and 2008 and close to that of 2007,” said the UN agency in a statement.

The hole in the layer over the Antarctic was discovered in the 1980s. It regularly tends to form in August, reaching a maximum size late September or early October before it fills again in December. The size is dependent on weather conditions.

This year, the hole began forming “earlier than before,” said WMO’s expert on the ozone Geir Braathen. On Sept.16, it stood at 24 million square kilometers, he said.

In 2008, the maximum reach was 27 million square kilometers while in 2007, the maximum was 25 million square kilometers. Experts have warned that the damage to the ozone layer, which shields the Erath from harmful ultra-violet rays, is so bad that it will only attain full recovery in 2075.

Ozone provides a natural protective filter against harmful ultra-violet rays from the sun, which can cause sunburn, cataracts and skin cancer as well as damage vegetation. Its depletion is cause by extreme cold athigh altitude and a particular type of pollution, from chemicals often used in refrigeration, some plastic foams, and aerosol sprays which have accumulated in the atmosphere.

Most of these chemicals, chlorofluorocarbons (CFCs), are being phased out under the 1987 Montreal Protocol, but they linger in the atmosphere for many years. -AFP

Picture taken at Mt. Guiting Guiting, Mayo’s peak, courtesy of Noel B.

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