Past Event

Tree-Ring and Historical Evidence for Dry and Wet Extremes in the Amazon Basin and Elsewhere in Brazil During the Late 18th and 19th Centuries

September 24, 2021
1:00 PM - 2:00 PM
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Event Description

Daniela Granato-Souza will be presenting her research that draws together historical sources and tree-ring reconstructions of wet season precipitation extremes in the eastern Amazon during the late 18th- and 19th-centuries. The historical accounts describe ship groundings on the Amazon River, crop failure, livestock mortality, and water shortages during many of the tree-ring reconstructed drought extremes. Heavy rains and flooding on major rivers are described during the wet extremes. The “Unknown Drought” of 1865 was the lowest single wet season precipitation total reconstructed with tree-rings in the eastern Amazon from 1759-2016 and appears to have been one of the lowest stream levels observed on the Amazon River during the historical era. The economic impact of the drought in 1865 was mitigated in Brazil by the highly inflated price of cotton due to the collapse of production in the American South during the Civil War, and is one reason why the magnitude of the moisture deficit and low water conditions on the Amazon during the Unknown Drought of 1865 have received limited historical or scientific attention.

All attendees should read “Multidecadal Changes in Wet Season Precipitation Totals Over the Eastern Amazon” before joining the workshop.

Event Speaker

Daniela Granato-Souza, Post-Doctoral Fellow in Geosciences at the University of Arkansas

Event Information

Free and open to the public; Registration is required. For more information, please contact Jessie Cohen at [email protected]

Part of the History and Climate Change workshop series hosted by the Environmental Sciences and Humanities Research Cluster and co-funded by the Institute for Social and Economic Research and Policy

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