Russian Far East scientists and their Chinese counterparts have completed a major project studying sedimentary rocks in the bottom of the Sea of Okhotsk, Japan, the Bering and Chukchi seas. For three expeditions they took a single material, which concludes studying how climate was half a million years before. Scientists calculate sure patterns of climate change on them and make predictions for the future.
At the bottom of the Sea of Okhotsk dipped a tube. Depth – several kilometers. The gravity tube on the rope length by gravity and falls Slots seabed. Scientists should not just get to land, but also carefully remove the rocks of 10 to 12 meters. These tests are complete in all the Far Eastern seas of the country. Russian-Chinese research boat furrowed thousands of kilometers. For three expeditions scientists brought 350 meters of core – rock from the bottom of the northern seas. It was divided into pieces and will now be studied in the laboratory. According to it, scientists have concluded what was the climate of 300-500 thousand years ago.
The fact that the seabed is practically not subjected to external influences, and contains all the mysteries of antiquity. But scientists are primarily interested in the climate puzzle. In the laboratory study the magnetic properties of selected rocks at different depths. And already it concludes that the same thing happened on Earth hundreds of thousands of years ago. For example, the polarity of the geomagnetic field of the earth has changed 798 000 years ago that led to the deaths of various animals and plants.
We can determine what was a field where there was a sign inversion of the polarity of the geomagnetic field. At this time, there were dissimilar changes. So far it is not known why mammoths became extinct. Maybe a change of polarity, something happened in the atmosphere has changed everything. There may have been some kind of global change, says Researcher NEISRI FEB RAS Galina Malakhov.
Samples from the depths of the sea and for exploring the ancient flora and fauna, it as well changes over time and not only below water. So, on the Kolyma and Chukotka once grew even tropical plants.
Plants have changed. Here, in fact present and ferns and tropical plants. Now none of this, of course not. But as fossils found – explains senior laboratory NEISRI FEB RAS Claudia Remizov.
But nowadays some large-scale climate change can be expected. Scientists have come to the conclusion that there is regularity occurrence of warming and cooling. Now in the Russian Far East peak warming, but after twenty years everything will return to that of fifty years ago.
It would probably be even a small bit colder. Perhaps as in our 60 years in Magadan. Then frost thirty on the coast of the Kolyma were common, now – is a rarity. And there were numerous of snow. We realized that now is the interaction with our Pacific area, with our seas, is the impact of the Atlantic via the Arctic Ocean. Across the Bering passage is exchanged water. In other words, there is an exchange of thermal parameters of the water and of the atmosphere, says one of the study participants, most important researcher NEISRI FEB RAS Mikhail Malakhov.
These findings, the researchers say, are relevant for the whole world. They study the interaction between the Pacific and Arctic oceans, namely, it is in lots of ways creates a world climatic patterns. So after twenty years on Earth will become cold and this trend as scientists believe will continue in the next 26,000 years. So much, in their explanation, the last period of gradual cooling and then the world will begin again the era of global warming.