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The magnetic properties of the selected sedimentary rock at various sea depths allow us to recreate the world climate picture and make predictions for the future
Russian Far Eastern scientists and their Chinese colleagues have completed a large-scale project to study sedimentary rocks at the bottom of the Okhotsk, Japan, Bering and Chukchi seas. For three expeditions, they selected a unique material, studying which they draw conclusions about how the climate was half a million years ago. Scientists calculate certain patterns of climate change and make predictions for the future.
On the bottom of the Sea of Okhotsk a special tube is immersed. The depth is several kilometers. Gravitational tube on a long cable under the influence of gravity falls and cuts the seabed. Scientists need not just to get to the ground, but also carefully remove 10-12 meters of rock. Such tests they did in all the Far Eastern seas of the country. A Russian-Chinese research vessel fired thousands of kilometers. For three expeditions scientists brought 350 meters of core - rocks from the bottom of the northern seas. He was divided into pieces and will now be studied in the laboratory. According to him, scientists will draw a conclusion, what was the climate of 300-500 thousand years ago.
“We can determine what the field was when the polarity sign of the geomagnetic field reversed. At this time, there were various changes. It is still unknown why the mammoths died out. Maybe there was a change of polarity, something happened in the atmosphere, everything changed. Perhaps there were some global changes, ”says Galina Malakhova, a researcher at the SBKNII FEB RAS.
The samples from the sea depths are also studied for the ancient flora and fauna, it also changes over time, not only underwater. So, on the Kolyma and Chukotka, once even grew tropical plants.
But in our time, there should not be any large-scale climate changes. Scientists came to the conclusion that there is a regularity in the onset of warming and cooling. Now in the Russian Far East, the peak of warming, but in twenty years everything will return to the indicators of fifty years ago.
"Probably, it will be even a little colder. Perhaps, as in our 60-ies in Magadan. Then frosts over thirty on the coast of Kolyma were common, now it is a rarity. And there was a lot of snow. We realized that now the interaction of the Pacific with our region, with our seas, is going on, the Atlantic influence is moving through the Arctic Ocean. Through the Bering Strait, water is exchanged. In other words, there is an exchange of thermal parameters of water, and of the atmosphere, "says one of the participants in the study, a leading researcher at the Institute of Experimental Physics of the Far East RAS Mikhail Malakhov.