Extreme cold weather that swept the world during the ice age, 80-10 thousand years ago, accompanied by a fall-rise in the northern Atlantic Ocean temperatures to 10 degrees every few decades. Rapid climate change is apparently due to the formation of land bridges connecting the North American continent with Asia.
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| No flow. When the Bering Strait (box, lower left) was closed at the height of the last ice age, any sudden influx of fresh water to the North Atlantic couldn't flow through the Arctic Ocean to the North Pacific, making episodes of abrupt climate change much more likely. (Picture from: http://news.sciencemag.org/) |
According to Aixue Hu, climate researchers from the National Center for Atmospheric Research in Boulder, United States, the sea around the world at the beginning of the ice age receded. As a result, sea levels fell by up to 50 meters from the current altitude. Bering Strait to dry, creating a land bridge that linked Siberia and Alaska.
Forming land bridge connecting the area as wide as 1.500 kilometer or two times the length of the island of Java. Dry soil is a migration path from Asia to America.
Formation of land bridges have a major impact. Salt exchange between the Pacific and Arctic Oceans, which originally took place in the Bering Strait, stalled. As a result, most of the Arctic Ocean fresh water flowing into the Pacific Ocean.
Simulations performed showed Hu moments of the land bridge formed during the Ice Age, from the Arctic freshwater flows into the Atlantic Ocean, making the reversal of water stalled.
"When the separator is formed in the Bering Strait land, the circulation of ocean currents take 1,400 years to turn around," said Hu. "When filled with water, the circulation flow only takes 400 years."
Circulation of ocean currents that flow adafah giant water that circles the earth, passing through three major oceans, the Pacific, Indian, and Atlantic.
Climate modeling experts from the National Oceanic and Atmospheric Administration, Ronal Stouffer, said the Bering Strait has long been known as a counterweight to the climate, especially for the North Atlantic region. Hu modeling conducted to prove that the area is split between two oceans and two continents play a role in determining global climate conditions. *** [SCIENCEMAG | ANTON WILLIAM | KORAN TEMPO 3949]
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