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Posted Tue Apr 12 2011: from EnvironmentalResearchWeb:
Satellites show effect of 2010 drought on Amazon forests http://apocadocs.com/s.pl?1302630261
A new study has revealed widespread reductions in the greenness of Amazon forests caused by the last year's record-breaking drought. "The greenness levels of Amazonian vegetation - a measure of its health - decreased dramatically over an area more than three and one-half times the size of Texas and did not recover to normal levels, even after the drought ended in late October 2010," says Liang Xu of Boston University and the study's lead author. The drought sensitivity of Amazon rainforests is a subject of intense study. Computer models predict that in a changing climate with warmer temperatures and altered rainfall patterns, the ensuing moisture stress could cause some of the rainforests to be replaced by grasslands or woody savannas. This would release the carbon stored in the rotting wood into the atmosphere, and could accelerate global warming.... The maps show the 2010 drought reduced the greenness of approximately 2.5 million square kilometers (965,000 square miles) of vegetation in the Amazon - more than four times the area affected by the last severe drought in 2005.... "Last year was the driest year on record based on 109 years of Rio Negro water level data at the Manaus harbor. For comparison, the lowest level during the so-called once-in-a-century drought in 2005, was only eighth lowest," said Marcos Costa, coauthor from the Federal University in Vicosa, Brazil.
[Read more stories about: rain forest depletion, drought, feedback loop, tipping point]

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