Officials at the Federal University of Siberia conducted a dendrochronological analysis, studying the annual rings of ancient trees. As a result, scientists have identified several areas in which the most noticeable cooling in the northern hemisphere occurred in the first millennium AD.
The Russians scientists concluded that the powerful volcanic eruptions that occurred in the first millennium AD had a serious impact on the climate, reports the publication Dendrochronologia.
The tree rings retained the cold wave caused by volcanic activity.
When volcanoes erupt, their aerosols and sulfates accumulate in the atmosphere, where they can persist for several years, reducing the intensity of solar radiation and contributing to the cooling of the air. This can even affect global circulation, the researchers said.
Abnormal cold snaps occurred in 536, 541 and 542 AD. Then, the climate changed in parts of Europe, North Atlantic and East Asia. During those cold waves, the temperature dropped by about 4°C.
Thanks to Martin Siebert for this link
“If Bill Gates knows about CO2 and volcanoes, he will design ‘mega stoppers’ to plug the volcanoes and save the earth from “hoax” global warming,” says Martin. “Volcanoes are producers, really CO2 producers. LOL”