In the distant past because of the almost complete stop of the “conveyor belt” of currents off the coast of Antarctica and a sharp decrease in the proportion of CO2 in the atmosphere the ice caps of the Earth began to retreat and advance every 100 thousand years. Reports Hvilya.
A modern ice age in Earth’s history, how geologists now believe, began about 2.6 million years ago. Its main feature is that the area of glaciation and surface temperature of the Earth during its period were not constant. In other words, the glaciers are continuously retreating and advancing.
Some geologists and climatologists believe that abrupt climate change is associated not with “space”, but it is earthly factors such as the restructuring of the “conveyor belt” of currents in the oceans or sudden increase or decrease of the share of CO2 in the atmosphere.
European experts analyzed changes in permafrost conditions on the banks of the Lena river and its tributaries and came to the conclusion that the Siberian winter began to thaw, not with the advent of the industrial revolution, and already seven thousand years ago.
Adam Hasenfratz (Adam Hasenfratz) from the Higher technical school of Switzerland in Zurich and his colleagues found the first definite answer to this question by studying sediment samples, extracted from the bottom of the Atlantic ocean in the vicinity of the South Bouvet island, one of the most isolated scraps of land in the world.
These deposits, as the scientists explain, was formed at the bottom of the Atlantic over the past 1.5 million years, and within them are preserved microscopic shells and other remains of algae and plankton that lived in ancient seas.
The slowing of the circulation of currents in the oceans and the consequent increase in its ability to absorb carbon dioxide could serve as one of the main causes of the onset of the last ice age.
Recall Geophysics from the University of Washington explained to mankind the mysterious green icebergs that sometimes occur Antarctica.
As reported by the portal “Znayu” in Antarctica rift glacier brunt will lead to the formation of a huge iceberg with an area of 1700 square kilometers.
Also “Znayu” I wrote just recently became aware of the fact that in Canada, the melting of Arctic ice has exposed the plot of land that has remained hidden for over 40 thousand years.