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News Report

In: Science

Submitted By cikfathi
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1.0 REPORT 1
NEWS REPORT

Published: Wednesday January 27, 2010 MYT 9:21:00 AM
Ozone hole healing could cause climate warming

WASHINGTON: Scientists at the University of Leeds found that although the hole in the ozone layer is steadily closing, the repair could actually increase warming in the southern hemisphere, reported Xinhua news agency.
The findings which appeared in Wednesday’s US journal Geophysical Research Letters, added that the discovery of a previously undiscovered feedback shows that the Antarctic ozone hold has helped to shield this region from carbon-induced warming over the past two decades.
The Antarctic ozone hole was once regarded as one of the biggest environmental threats.
Citing Professor Ken Carslaw of the University of Leeds who co-authored the research, Xinhua reported that high-speed winds in the area beneath the hole have led to the formation of brighter summertime clouds, which reflect more of the sun’s powerful rays.
“These clouds have acted like a mirror to the sun’s rays, reflecting the sun’s heat away from the surface to the extent that warming from rising carbon emissions has effectively been cancelled out in this region during the summertime,” said Carslaw.
He added that: “If, as seems likely, these winds die down, rising CO2 (carbon dioxide) emissions could then cause the warming of the southern hemisphere to accelerate, which would have an impact on future climate predictions.”
The Leeds team made their prediction using a state-of-the-art global model of aerosols and two decades of meteorological data.
The key to this newly-discovered feedback is aerosol tiny reflective particles suspended within the air that are known by experts to have a huge impact on climate.
Greenhouse gases absorb infrared radiation from the earth and release it back into the atmosphere as heat, causing the planet to warm up over time.
Aerosol works against this by reflecting heat from the sun back into space, cooling the planet as it does so.
Beneath the Antarctic ozone hole, high-speed winds whip up large amounts of sea spray, which contains millions of tiny salt particles.
This spray then forms droplets and eventually clouds, and the increased spray over the last two decades has made these clouds brighter and more reflective.
As the ozone layer recovers it is believed that this feedback mechanism could decline in effectiveness, or even be reversed, leading to accelerated warming in the southern hemisphere.
“Our research highlights the value of today’s state-of-the-art models and long-term data sets that enable such unexpected and complex climate feedbacks to be detected and accounted for in our future predictions,” added Professor Carslaw. -- Bernama
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