By Bob Weber The Canadian Press Wed., March 27, 2019 Research has uncovered powerful evidence linking shrinking sea ice in the Arctic to snow and rain in central North America. A study published Wednesday in the journal Nature suggests that a long dry period about 8,000 years ago through the centre of the continent was influenced by disappearing sea ice — the same mechanism that many climatologists believe is behind today’s increasingly extreme weather. “We have really strong evidence there is a connection,” said Cody Routson of Northern Arizona University. “Moving forward, this mechanism should be really important.” Routson and his colleagues looked at a period between 2,000 and 10,000 years ago. Routson had long been interested in the fluctuations of local ancient climates and thought it was time to widen the scope. “I had this sense that there were other factors that were bigger.” Article Continued Below He decided to look at the temperature difference between the Arctic and the equator. That gap powers the jet stream, a high-altitude river of air that strongly influences the air, temperature and moisture circulation around the world. The team combined data from 219 sites around the world and used lake sediments and… Read full this story
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