10 Oct 2011:
Amazon Drought Released
More CO2 than India’s Annual Emissions
A drought that affected large areas of the Amazon rainforest in 2010 triggered the release of about 1.8 million tons of carbon dioxide
, more than the total annual CO2 emissions of India, according to a new study. After combining a NASA carbon cycle simulation model and satellite data that reflects the
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Environmental Research Letters
Decline in Amazonian forest net primary production, 2008-2010
“greenness” — or light interception capacity — of forest canopies, researchers at the NASA Ames Research Center found that net primary production in some forest areas decreased by an average of 7 percent compared with 2008 data. The drought not only reduced the amount of CO2 absorbed by the rainforest, but the drying of normally flooded areas also released large amounts of CO2 through the decomposition of soil and dead wood. Overall, researchers found that emissions caused by the drought roughly equalled the combined emisisons of human-caused deforestation and forest fires in undisturbed forests. According to the study, published in the journal Environmental Research Letters
, the results suggest “a more widespread and long-lasting impact to Amazonian forests than what could be inferred based solely on rainfall data.” While the NASA scientists said the effects could ultimately be offset by plant growth when normal conditions resume, other researchers warn that an increase in severe droughts could portend the collapse of the Amazonian rainforest system
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