It suggests that the increased volatility could be due in part to global warming, along with earlier pollution of the atmosphere by ozone-depleting chemicals. 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. 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. 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.
By Kevin Krajick. This South America climate guide makes trip planning a breeze! ... South Dakota, set a record-wet … Joel Richards The chemicals were banned in the 1980s, but their effects have persisted.The third major factor is the so-called Hadley cell, a global phenomenon that lofts warm, moist air from near the equator and sends it further north and south, dropping precipitation as it goes. Scientists have filled a gaping hole in the world’s climate records by reconstructing 600 years of soil-moisture swings across southern and central South America. During recent decades, the Hadley cell has expanded towards the poles, likely in response to human-induced climate changes; this has shifted rainfall patterns and broadened the subtropical dry zones, especially in the Southern Hemisphere.The atlas indicates that there has been a steady increase in the frequency of widespread droughts since 1930, with the shortest return times, about 10 years, occurring since the 1960s. Severe water shortages have affected central Chile and western Argentina from 1968-1969, 1976-1977, and 1996-1997. By continuing to use this website, you consent to Columbia University's usage of cookies and similar technologies, in accordance with the Beijing ICP prepared NO.16065310-3Scientists alarmed by extreme weather trends in South America SHARE. The new long-term record "highlights the acute vulnerability of South America to extreme climate events," he said. Joel Richards Share . Beijing ICP prepared NO.16065310-3Copyright © 2020 CGTN. These are controlled in part by periodic cyclic changes in sea-surface temperatures over both the Pacific and the Atlantic, which can bring both droughts and wet periods. It is home to the world's largest river (the Amazon) as well as the world's driest place (the Atacama Desert). by Kevin Krajick | July 7, 2020. Comments. The authors say greenhouse-gas-driven shifts in these patterns appear linked to a still continuing 10-year drought over central Chile and western Argentina that has caused severe water shortages, along with heavier than normal rains in eastern regions.Precipitation is also controlled in part by the Southern Annular Mode, a belt of westerly winds that circles Antarctica. ... a town in South Jersey, on June 19 and 20, 2019. SHARE. Along with documenting the mechanisms behind natural changes, the new South American Drought Atlas reveals that unprecedented widespread, intense droughts and unusually wet periods have been on the rise since the mid-20th century. Encyclopedic entry.
The air settles near the surface at predictable latitudes, by which time the moisture has been largely wrung out; this creates the permanently dry zones of the subtropics, including those in South America. 2019's 12 Most Extreme Weather Events So Far Barri Segal 8/16/2019. Widespread intense droughts and unusually wet periods have been on the rise since the mid-20th century in South America, according to new research.Scientists have reconstructed 600 years of soil-moisture swings across southern and central South American and researchers are alarmed by the trends they are observing.Copyright © 2020 CGTN. Currently, the drylands of central Chile and western Argentina are locked in one of the most severe decade-long droughts in the record. News Subtitle: Newly Comprehensive Continental Drought Atlas Covers Last 600 Years. The Best Places to Retire in America … We tell you the best time to visit South America, country by country. In recent decades, it has been stuck in the south — largely a result of ozone-depleting chemicals used in 20th-century refrigerants that destroyed atmospheric ozone over Antarctica, scientists believe. Copied. Sign me up for the Earth Institute newsletter, so I can receive more stories like this.This website uses cookies as well as similar tools and technologies to understand visitors' experiences. TWEET. Tree Rings Show Unprecedented Rise in Extreme Weather in South America . Avoid extreme weather.. The aftermath of a storm which dumped up to five feet of water and hail in Argentina has been revealed in images released by the World Meteorological Organisation.

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