Regional map of annual net primary production anomalies derived from subtraction of the 2009 and 2010 from 2008 total NPP values from the CASA (Carnegie Ames Stanford Approach) simulation model. All carbon fluxes shown are in units of grams of carbon per square meter per year. Image courtesy of ERL via mongabay.comOctober 9 ( – The 2010 drought that affected much of the Amazon rainforest triggered the release of nearly 500 million tons of carbon (1.8 billion tons of carbon dioxide) into the atmosphere, or more than the total emissions from deforestation in the region over the period, estimates a new study published in the journal Environmental Research Letters.

Christopher Potter from NASA Ames Research Centre and colleagues combined a carbon cycle simulation model with NASA satellite data which reflects the 'greenness' or net primary production of forest to develop their estimate. The researchers only accounted for loss in CO2 uptake by vegetation caused by drought stress, including decomposition of soil and dead wood in regularly flooded forest areas left dry by the drought. Their estimate did not include emissions from fire associated with the drought.

Overall the researchers found emissions from the drought — the worst ever recorded in the Amazon — to be "roughly equivalent to the combined effects of anthropogenic deforestation and forest fires in undisturbed Amazonian forests."

However Potter and colleagues said that some of the losses could be offset by increased plant growth with the resumption of normal conditions. Other studies showed such a recovery in the aftermath of the 2005 drought, which at the time had been the most severe on record.

Nevertheless other researchers fear that the apparent increase in severe droughts — believed to be a product of deforestation, fragmentation, and climate change — may portend a more dire scenario: collapse of the Amazon rainforest ecosystem. […]

2010 Amazon drought released more carbon than India's annual emissions



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