Rhett A. Butler in Mongabay: Analyzing the impact of the severe Amazon drought of 2005, a team of 68 researchers across 13 countries and 40 institutions found evidence that rainfall-starved tropical forests lose massive amounts of carbon due to reduced plant growth and dying trees. The 2005 drought — triggered by warming in the tropical North Atlantic rather than el Niño — resulted in a net flux of 5 billion tons of carbon dioxide (CO2) into the atmosphere — more than the combined annual emissions of Japan and Europe — relative to normal years when the Amazon is a net sink for 2 billion tons of CO2.The findings suggest that in the face of warming climate, relying on tropical forests as a massive carbon sink is a perilous proposition, raising questions about the effectiveness of schemes to offset industrial emissions by protecting rainforests without also curbing fossil fuel use. Should droughts worsen on a global scale, forests could become a net source of emissions, exacerbating climate change.
"For years the Amazon forest has been helping to slow down climate change. But relying on this subsidy from nature is extremely dangerous", said lead author Oliver Phillips, referencing newly published research indicating that tropical forests have absorbed as much as a fifth of fossil fuel emissions in recent decades.
"If the earth's carbon sinks slow or go into reverse, as our results show is possible, carbon dioxide levels will rise even faster," Phillips, a professor at the University of Leeds, added. "Deeper cuts in emissions will be required to stabilize our climate."…
The largest river on the planet, the Amazon, forms from the confluence of the Solimões (the upper Amazon River) and the Negro at the Brazilian city of Manaus in central Amazonas. Seen from space, via NASA
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