Feeds

This year's ozone hole set to be a whopper

Penguins rush to buy suncream

Application security programs and practises

The hole in the Ozone layer over Antarctica this year is shaping up to be one of the biggest ever, satellite images from the European Space Agency (ESA) suggest.

The area of depletion, as the scientists call it, already covers ten million square kilometres, is still expanding, and won't reach its maximum until some time in September. Only the holes in 1996 and 2000 were larger at this stage in their development, ESA says.

The Ozone layer naturally fluctuates through the year, reaching its peak thickness in the summer months and fading away during the winter. Regional variations in weather systems play a part in the timing of the hole's appearance, ESA explains.

During the southern hemisphere winter, the prevailing winds in Antarctica, known as the polar vortex, keep the atmospheric mass above the Antarctic continent is isolated from exchanges with mid-latitude air.

This keeps the air mass above the continent cold, and in the cold and dark, clouds that contain chlorine can form in the polar stratosphere.

Once the spring returns, this chlorine, much of it originating from man-made pollutants like chlorofluorocarbons, disrupts the ozone layer.

The sunlight splits the chlorine into highly reactive ions that break ozone down into normal oxygen molecules. One molecule of chlorine can break down thousands of ozone molecules.

However, use of CFCs has decreased significantly since the 1987 Montreal Protocol, and there is evidence that the protective atmospheric layer is beginning to recover from the damage wrought. A full recovery is not expected before 2050. ®

Build a business case: developing custom apps

More from The Register

next story
Asteroid's DINO KILLING SPREE just bad luck – boffins
Sauricide WASN'T inevitable, reckon scientists
BEST BATTERY EVER: All lithium, all the time, plus a dash of carbon nano-stuff
We have found the Holy Grail (of batteries) - boffins
The Sun took a day off last week and made NO sunspots
Someone needs to get that lazy star cooking again before things get cold around here
Boffins discuss AI space program at hush-hush IARPA confab
IBM, MIT, plenty of others invited to fill Uncle Sam's spy toolchest, but where's Google?
Famous 'Dish' radio telescope to be emptied in budget crisis: CSIRO
Radio astronomy suffering to protect Square Kilometre Array
Bad back? Show some spine and stop popping paracetamol
Study finds common pain-killer doesn't reduce pain or shorten recovery
Forty-five years ago: FOOTPRINTS FOUND ON MOON
NASA won't be back any time soon, sadly
prev story

Whitepapers

Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Securing Web Applications Made Simple and Scalable
Learn how automated security testing can provide a simple and scalable way to protect your web applications.