понеделник, 15 април 2013 г.

Antarctica disappears into the sea ice around Antarctica is increasing.

Antarctica disappears into the sea ice around Antarctica is increasing.

Unlike sea ice in the Arctic ice in the sea around Antarctica has grown a record in 2010, according to the Royal Netherlands Meteorological Institute.
 Sounds curious, but increases global warming on ocean ice around Antarctica is likely a consequence of the accelerated melting of ice covering the southern continent.
The study of the journal Nature Geoscience said that fresh water from melting "ice tongues", which are the extension of the continental ice cap into the ocean, creating a layer of cold surface water. This contributes to the formation of sea ice and ice crust.
Accelerated melting of continental ice with warming explain the expansion of ice around the continent.
Last year was the ninth warmest since records began in 1850, according to the World Meteorological Organization of the United Nations.
Summer melting of ice at the South Pole is ten times faster than 600 years ago, the fastest melting occurred in the last 50 years say scientists from the UK and Australia.
A research team from the Australian National University and the British Antarctic topographic Institute have released a probe to a depth of 364 m in the ice cover of the James Ross Island in the northern part of Antarctica to measure temperatures in the region in the past.
By measuring the density of these layers are determined how history is compared with the melting temperature changes in the ice cover at this location over the past 1,000 years.
"We found that the cold of Antarctica and least summer thaw was 600 years ago," said lead author of the project, adding: "At the time, temperatures were about 1.6 degrees lower than that recorded in the late 20th century. "
Although the 10 hottest years since records began, the speed at which the Earth's surface is warming slowed somewhat since 2000, prompting scientists to seek explanations for the pause that refutes and gives them food many of their opponents.
Experts from France and Spain, said recently that the oceans accumulate more heat from the air and thus explain the delay of surface warming, but suggest that the pause may be temporary and brief.
The melting of the ice caps in the Arctic (north) and Antarctica (south) one third of the rise in sea levels worldwide.
 A third is due to thermal expansion of the oceans.
 The other third is melting glaciers in the mountains.

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