/var/www/vhosts/ziare/news//boxes/box1.php Arctic melt - News, Technology, Space, Science - Breaking News and interesting stories


 Fresh articles

» IOS6 news and fixes
» Strange Martian crater
» 100 Petabits per second
» Artificial life created
» Space rock contains organic molecular feast
» 10 Failed Doomsday Predictions
» Universal phone charger
» Moon buildings
» Epassports RFID danger
» 500Gb optical




Sexy things-> Sexy things (4)
Bulk-> Bulk (15)
Technology-> Technology (42)
Space-> Space (35)
UFO-> UFO (5)
Funny-> Funny (4)
Earth Life-> Earth Life (9)
Internet-> Internet (10)
Health-> Health (1)



 Most popular

» Google unifies search results
»Google under water
»Moon buildings
»500Gb optical
»Scientists Levitate Small Animals
»Jet stream is weakening
»Orion new nasa vehicle
»Saturns moon like ocean floor
»How Cells Store Fat



 Other articles

»Midori new operating system
»Honda first hydrogen cars
»New Arctic Inhabitants: Trees
»100 Petabits per second
»Marine Species Collapse by 2048
»Why Music Gives Us the Chills
»U.S. Population Passes 300 Million
»Artificial life created
»Laptop best battery
»Laser Zaps Viruses
»Venus lightning
»Spectacular new images of Mars
»Scientists Create Cloak of Partial Invisibility
»Astrological Sign May be Wrong
»Windows Vista failures
»Google Sky
»Flying Saucer Air Travel
»Moon buildings
»Sings in countries
»Die old age


Arctic meltArctic sea ice is melting at a rate far quicker than predicted by climate change computer models and could disappear completely before the middle of the century, scientists have warned.

The study, published in the latest edition of the journal Geophysical Research Letters, found that the actual rate at which summer sea ice had shrunk per decade during the past 50 years was more than three times faster than an average of 18 of the most highly regarded climate simulations.

Retreating Arctic ice is considered a key indicator of the pace of global warming by environmentalists, and one that could have devastating knock-on repercussions for the wider climate, including warmer oceans and rising sea levels.

Declining ice levels also poses a threat to Arctic wildlife including polar bears, walruses and ringed seals.

According to the Intergovernmental Panel on Climate Change, which releases the third of three reports into the causes, consequences and mitigation of global warming in Thailand this week, the Arctic could be ice-free in summer by the latter part of the 21st century.

But the research, conducted by the U.S.-based National Center for Atmospheric Research (NCAR) and the University of Colorado's National Snow and Ice Data Center (NSIDC), demonstrates that the 18 models on which the IPCC has based its current recommendations could already be out of date -- and that the retreat of the ice could already be 30 years ahead of the IPCC's worst case scenario.

"This suggests that current model projections may in fact provide a conservative estimate of future Arctic change, and that the summer Arctic sea ice may disappear considerably earlier than IPCC projections," said NSIDC's Julienne Stroeve who led the study.

Climate change models of Arctic sea ice cover in September, the month when ice is usually at its minimum, suggest an average loss of 2.5 percent of ice cover per decade from 1953 to 2003. The worst case simulated by an individual model predicted a decade-on-decade reduction of 5.4 percent.

Yet when scientists studied observable data for the same period, including shipping logs, aerial photos and satellite images, they discovered the actual figure for ice loss from 1953 until 2006 to be 7.8 percent.

Furthermore, the rate of deterioration seemed to be accelerating, topping nine percent per decade since 1979.

The discrepancy between computer modelling and reality is most likely due to the fact that simulations have failed to fully take into account the impact of increased levels of carbon dioxide emissions in the atmosphere, the researchers believe.

Models have typically attributed half of the loss of ice to greenhouse gases and half to natural variations in the climate cycle. But now, many believe the first factor could be playing a significantly greater role.

Earlier this month NSICD scientists reported that winter sea ice cover in the Arctic was just 14.7 million square kilometers (5.7m square miles) -- slightly better than the all-time low 14.5m square kilometers (5.6m square miles) in 2006 -- but well short of the 15.7m average for 1979-2000.

The Arctic is especially prone to global warming because of the dangers of the so-called "feedback loop" caused by melting ice.

While ice reflects around 80 percent of the sun's heat, having a cooling effect, blue sea water can absorb up to 95 percent of solar radiation, warming up the sea and accelerating the melting process further.

"While the ice is disappearing faster than the computer models indicate, both observations and the models point in the same direction: the Arctic is losing ice at an increasingly rapid pace and the impact of greenhouse gases is growing," said co-author Marika Holland of NCAR.

 Read this article Email this article

Article © News, Technology, Space, Science - Breaking News and interesting storiesShare


You need to login first

Satellite Shooted down

  Did you know?...

- Women in ancient Egypt prevented pregnancy with
plugs made of crocodile droppings?

- Based on artifacts and cave paintings, Ice Age women were likely to enjoy sex as much as their male mates?

- In 2005, the average first time for US girls occurred at the age of 17?

- Known aphrodisiacs of the food world include chocolate, oysters and spicy foods?

- That females have a weaker sex drive than men is a  cultural misconception?

- The most common sexual problem among men is premature ejaculation?

- It is a common misconception that pregnancy can’t occur without male orgasm?

- Whether put to use or not, males produce about 300 million sperm every day?



CNN Page



Google News

World of Warcraft News

Romanian Web Hosting

Romanian Domain Registrar

.BIZ Domain Registrar


Funny Things

Golden Sands Bulgary

Web Hosting News

Web Hosting Romania

Gadgets Resources

Top Video Games Online



[New account] [Forgoten password]