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It turns out what started the last ice age

The University of Arizona A new research study looking at the conditions of the recent glaciation by an American research team reported, and natural earth sciences Publish their study in a journal. Climate researchers have faced two puzzles about this glaciation: Where did this ice sheet come from and why does it owe its speed to its formation?

It is not easy to understand all the conditions that cause the alternation of glaciations and ice ages in the northern hemisphere of our planet, that is, the latitudinal formation of the ice sheet and its subsequent retreat. Researchers have now been able to find impetus to answer these questions based on data from the last glaciation, but experts say the answer may be the same for other glacial cycles.

Over the course of a hundred thousand years, in just ten thousand years, huge ice shields have developed from the growth of local glaciers and ice caps in Canada, Siberia and northern Europe. While it’s clear how changes in our planet’s trajectories affect radiation from the Sun, resulting in an icy process, it doesn’t really explain how ice covered northern Europe while the weather was relatively mild. The marine area of ​​this region is largely ice-free due to the North Atlantic Current, which means that there is no sea ice as there is in the Canadian Arctic. In Scandinavia, summer temperatures are well above freezing, while in the Canadian Arctic it freezes in summer, even though the two regions are at the same latitude. Because of this discrepancy, climate models have not been able to determine how northern European glaciers grew and how the last glaciation might have started.

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Arctic archipelago of Canada. Between these islands is the Northwest Passage, which provides not only a possible route for ships but also a water course.

Source: Earth Observatory

To get the answers, the researchers created a fairly complex and detailed model of the Earth system in which the state of the beginning of the last glaciation was realistically shown. This model was used to find ocean routes in the Canadian Arctic archipelago that may have been the main driver of the icy climate through telecommunications and which may have determined whether ice sheets formed in Europe.

It turns out that as long as these roads (this is the area of ​​\u200b\u200bthe Northwest Passage and the Nares Strait) are in the Canadian archipelago, no ice cover can form in Scandinavia due to the ingress of fresh water into the ocean. When the Canadian archipelago “freezes”, if not to its full depth, it is approx. At a thickness of 150-200 m, stratified fresh water can no longer move from one sea basin to another, so its disturbing effect disappears, giving way to frost.

This theory is supported by samples taken from marine sediments, the analysis of which has already shown that ice on Canadian soil preceded ice in Europe a few thousand years ago, but now it is clear why. It is possible that the relationship revealed applies not only to recent glaciers but also to other glaciers. It could also explain shorter cold periods, such as the Lesser Dry Age, which was at the end of the last ice age, a cold period of nearly a thousand years on an already warming planet.

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