Saturday , July 24 2021

The finding paralizzar under Antarctica to accelerate melting



Source & # 39; radioactive heat, that at the heart of the World contributes to the ice dissolution, was discovered under the Convention Antarctica. It is close to the Middle Pole the magnetic side and in the future can & # 39; accelerate the melting of the frozen mass at & # 39; the area with water to accumulate in the bottom of the glaċer. It was identified after a survey conducted radar of the British Antarctic Survey (Bas), the British organization to investigate in Antarctica and finding published in the magazine Scientific Reports.

"The discovery confirms that the ice dissolution in Antarctica also suffers local effects, such radioactive sources or volcanoes, because it is a continent covered by snow, b & # 39; difference Arctic is an ocean to freeze and suffer only the general effects of & # 39; the global warming ", told the ANSA Antonio Meloni, president of the Italian National Scientific Commission for Antarctica.

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Under the Antarctic ice, the ancient lost continents remains are hidden, according to the European Goce satellite, which from 2009 to 2013 studied the gravity of Earth. There are at least three fragments, previously united in Africa, Australia and India, the oldest b & # 39; age estimated between 1,000 million and 550 million years.

Reports published in the magazine Science, the discovery is due to the German University & # 39; Kiel and the British Antarctic Survey (Bas). The researchers analyzed data from the mission & # 39; the European Space Agency (ESA), which measured the subtle differences in severity from one point to another in the World b & # 39; resolution & # 39; 80 kilometers, and comparing it to the course & # 39; seismic waves, which allows you to examine the interior of the planet. B & # 39; this way, they got 3D map of continental plates opened a window on the depths of the earth and, b & # 39; in particular, from Antarctica.

These pictures of gravity "are revolutionize our ability to studying the least known continent, Antarctica," said Fausto Ferraccioli, responsible for geological and geophysical research & # 39; Bas. Under East Antarctica, added that "we see exciting mosaic" of & # 39; fragments & # 39; lost continents, "to reveal similarities and differences between shell & # 39; under Antarctica and other continents" joined by fragments "to 160 million years ago. of & # 39; years" .

It was also found that West Antarctica has a thin crust, between 20 and 35 kilometers thick compared to & # 39; that of East Antarctica, formed from remnants of & # 39; ancient continents & # 39; 40 to 60 kilometers thick, separated & # 39; younger The ruins are at least three oldest are the fragment connected to & # 39; the so-called Mawson Crater, which in the past included parts & # 39; the Southern Australia, and hidden underground vestige of Queen Maud. Both fragments are separated from Gamburtsev mountains, buried under ice.

The origin of the third fragment, situated between the Weddell Sea and the South Pole, is unclear. Three fractions emerged from the date of & # 39; Goce and, according to the researchers, "represent an important new element to the study of Antarctica".


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