The current warming of the climate has been strongest in the last 7,000 years. About informs TASS, with reference to the press service of the Ural Federal University.
This study is based on tree-ring chronology: scientists measured the thickness of the tree-rings of many semi-fossil trees at Yamal. The thickness of the ring depends on the weather at the time of its formation, and therefore every tree carries a “fingerprint” of the time period in which it grows. It took nearly 40 years to collect tree data.
“Due to cyclical changes in Earth’s orbital parameters at subpolar latitudes of the Northern Hemisphere, there is a gradual decrease in solar energy intake during the summer months. This stage began about 8-9 thousand years ago and continues to this day. But tree-ring data show a trend reversal in the mid-19th century. “The temperature began to rise very quickly and reached its highest values in recent decades,” said Rashit Khantemirov of the Ural Branch of the Russian Academy of Sciences and the Ural Federal University. At the same time, experts note that today anthropogenic warming factors have become decisive compared to natural ones.
In the future, the study’s authors plan to expand their chronological scale by at least two millennia. They are supported by scientists from the University of East Anglia, who are considered the world’s best experts in learning about temperature fluctuations over the centuries.
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