Fragile hydrological equilibrium in the Western Amazon threatened by climate change

Now a new study led by researcher Eduardo Maeda from the University of Helsinki has put together a unique combination of satellite data and hydrological measurements to study the problem. The results are a reason for concern.

"What we see is that while some areas of the Amazon forest seem to be resistant to these extreme climatic events, other large areas show a fragile equilibrium. The problem is that when this equilibrium is broken, the impacts for the hydrological system and vegetation seem to be rather persistent, taking 3 to 4 years for the system to recover," says Eduardo Maeda.

This kind of disruption seems to be triggered only by rare extreme events, which occur in average every 20 years or more. This interval, in theory, would then be enough to allow a full recovery of the hydrological patterns and vegetation. But climate scientists are not so optimistic. Previous studies have shown that climate change may increase the frequency of droughts like the one occurred in 2005.

"Model simulations from previous studies by other groups indicate that, by 2025, the frequency of these events could be as high as 1 every 2 years," he says.

If these climate scenarios are confirmed, the study conducted by Maeda and collaborators indicates that the hydroecological system would no longer have time to recover. This would lead to serious consequences for a forest area almost 2 times bigger than Switzerland, causing massive tree mortality, and permanently change the face of the western Amazon.

The study was funded by the Academy of Finland, and had the collaboration of researchers from the University of Tokyo, Brazil's National Institute for Space Research, NASA-JPL and University of California.