Specialists from the Siberian Federal University (SFU), together with an international team of scientists, have found out why several global cataclysms occurred in the first millennium of our era.
We are talking about global warming and droughts that occurred in approximately the same time period.
In order to understand the cause of these cataclysms, the researchers analyzed data on tree rings. Specifically, those that grew in nine subarctic and high mountain regions of the Northern Hemisphere.
Based on the results of the first stage, they found that there are seven regions where the most clearly visible changes in the temperature regime of huge adjacent territories.
According to Olga Churakova, Doctor of Biological Sciences, tree rings are a unique archive by which you can understand changes in temperature conditions.
Warming peaks in the Northern Hemisphere were in the 280s, 990s and 1020s AD, when the impact of volcanoes on the planet’s climate during the long periods preceding these decades was minimal. It was established that 536, 541 and 542 AD were anomalously cold, when the eruption of an unknown volcano led to a global cooling in the North Atlantic, European, East Asian regions, including Siberia.
Olga Churakova, Doctor of Biological Sciences
Based on this, the researchers have identified the main cause of cataclysms – the eruption of stratospheric volcanoes.