This South America climate guide makes trip planning a breeze! By continuing to use this website, you consent to Columbia University's usage of cookies and similar technologies, in accordance with the Comments. Here, Natalia Edith Codoceo Flores amid the ruins of the Chilean village of Gualliguaica, which was flooded by a new reservoir in the 1990s; the water has now almost entirely receded. A severe lack of rainfall over southern South America during the summer of 2017 - 2018 has led to the worst drought in decades over portions of Argentina and Uruguay. This belt periodically contracts southward or expands northward, and when it contracts, it weakens the westerly winds that bring rain to South America. But the frequency of very dry summers has remained the same, which translates to bigger losses of expected yields when they do come along, he said.“Everything is consistent with the idea that you’ll be intensifying both wet and dry events with global warming,” said Jason Smerdon, a climate scientist at Lamont-Doherty and a coauthor of the study.Using newly developed tree-ring records from Peru, Brazil, Bolivia and Colombia, the group is now working to expand the atlas to cover the entire continent, and extend the climate reconstruction back 1,000 years or more, said Morales. Some trees can live 1,000 years. ... a town in South Jersey, on June 19 and 20, 2019. This wild, varied and extreme weather provides a dramatic backdrop for a new, seven-part Discovery Channel series, North America, which premieres Sunday at … America's Most Extreme Weather Cities 2019. One key factor: low-level westerly winds that blow moisture onto the continent from the Pacific. The atlas was Recent droughts have battered agriculture in wide areas of the continent, trends the study calls “alarming.” Lead author Mariano Morales of the Argentine Institute of Snow, Glacier and Environmental Sciences at the National Research Council for Science and Technology, said, “Increasingly extreme hydroclimate events are consistent with the effects of human activities, but the atlas alone does not provide evidence of how much of the observed changes are due to natural climate variability versus human-induced warming.” The new long-term record “highlights the acute vulnerability of South America to extreme climate events,” he said.Coauthor Edward Cook, head of the Tree Ring Lab at Columbia University’s Lamont-Doherty Earth Observatory, said, “We don’t want to jump off the cliff and say this is all climate change. This gave them confidence to extend the soil-moisture reconstruction back before written records.The authors say that periodic natural shifts in precipitation are driven by complex, interlocking patterns of atmospheric circulation on land and at sea. TWEET. Ring widths generally reflect yearly changes in soil moisture, and the researchers showed that collected rings correlate well with droughts and floods recorded starting in the early Spanish colonial period, as well as with modern instrumental measurements. By Kevin Krajick. Tree Rings Show Unprecedented Rise in Extreme Weather in South America .
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