JUL 03, 2020 7:41 PM PDT

The secrets uncovered in the South American Drought Atlas

A crucial new resource has been added to climate science recently: the most recent edition of the South American Drought Atlas. Published in the journal Proceedings of the National Academy of Sciences, the atlas reconstructs 600 years of soil-moisture data in South America, relating the ever-increasing frequency and intensity of droughts and wetness in the region.

Chile's Atacama desert. Photo: Pixabay

While the atlas comments on the climate fluctuations, it does not establish once and for all the level of influence of anthropogenic activity on the changes. Lead author Mariano Morales of the Argentine Institute of Snow, Glacier and Environmental Sciences at the National Research Council for Science and Technology, stated, "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." Instead, he says, the atlas, "highlights the acute vulnerability of South America to extreme climate events."

"We don't want to jump off the cliff and say this is all climate change. There is a lot of natural variability that could mimic human-induced climate change," furthered coauthor Edward Cook, head of the Tree Ring Lab at Columbia University's Lamont-Doherty Earth Observatory. 

Nevertheless, the findings of the moisture impacts on agriculture in the continent have been “alarming,” say the researchers. Covering Argentina, Chile, Uruguay, Paraguay, most of Bolivia, and southern Brazil and Peru, the atlas looks at dendrochronology analyses, using thousands of tree-ring records to build a picture of our climate history. 

Referring to the atlas’s main conclusions, co-author Jason Smerdon, a climate scientist at Lamont-Doherty, says, "Everything is consistent with the idea that you'll be intensifying both wet and dry events with global warming.” While southeastern parts of the continent are seeing heavier than normal rains, widespread droughts have affected central Chile and western Argentina, where some years have seen losses of up to two-thirds of some cereal and vegetable crops.

The researchers are currently working on expanding the range of the atlas, using tree-ring records from Peru, Brazil, Bolivia, and Colombia to reconstruct climate history dating back 1,000 years or more, said Morales.

Sources: PNAS, Science Daily

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
JUN 14, 2020
Plants & Animals
Giant Hornet Queen Struggles to Establish Her Nest
JUN 14, 2020
Giant Hornet Queen Struggles to Establish Her Nest
Giant hornets are among the world’s largest and deadliest hornets, which might explain why they’re so revere ...
JUN 19, 2020
Earth & The Environment
Reframing species conservation
JUN 19, 2020
Reframing species conservation
Following the failure of the 10-year plan for conserving biodiversity to reach its 2020 goals, a team of scientists has ...
JUN 30, 2020
Earth & The Environment
Soft coral garden in Greenland needs protection
JUN 30, 2020
Soft coral garden in Greenland needs protection
Research published in Frontiers in Marine Science paper describes the discovery of a soft coral garden in the waters off ...
JUL 17, 2020
Microbiology
Metal-Eating Microbes Are Discovered
JUL 17, 2020
Metal-Eating Microbes Are Discovered
Researchers at Caltech have serendipitously found microbes that consume manganese for energy.
JUL 15, 2020
Chemistry & Physics
New report analyzes the efficiency of 6 different fiber-catching devices
JUL 15, 2020
New report analyzes the efficiency of 6 different fiber-catching devices
A study from the University of Plymouth International Marine Litter Research Unit has released a report analyzing the ef ...
JUL 31, 2020
Chemistry & Physics
Advancing Nuclear Fusion by Taming the "Chirping" Plasma
JUL 31, 2020
Advancing Nuclear Fusion by Taming the "Chirping" Plasma
2020 turns out to a year of breakthrough for nuclear fusion. The world's largest fusion project ITER (International ...
Loading Comments...