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Topic: Amazon rainforests

NASA’s CALIPSO satellite helps scientists study link between Sahara Desert dust and Amazon Rainforest

 

Written by Rachel Molina
Science at NASA

NASA - National Aeronautics and Space AdministrationWashington, D.C. – The Sahara Desert is one of the least hospitable climates on Earth. Its barren plateaus, rocky peaks, and shifting sands envelop the northern third of Africa, which sees very little rain, vegetation, and life.

Meanwhile, across the Atlantic Ocean thrives the world’s largest rainforest. The lush, vibrant Amazon basin, located in northeast South America, supports a vast network of unparalleled ecological diversity.

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NASA Scientists say Hidden Wildfires Taking Big Toll on Amazon Rainforest

 

NASA - National Aeronautics and Space AdministrationPasadena, CA – Using an innovative satellite technique, NASA scientists have determined that a previously unmapped type of wildfire in the Amazon rainforest is responsible for destroying several times more forest than has been lost through deforestation in recent years.

In the southern Amazon rainforest, fires below the forest treetops, or “understory fires,” have been hidden from view from NASA satellites that detect actively burning fires. The new method has now led to the first regional estimate of understory fire damages across the southern Amazon.

Understory fires doing long term damage to the Amazon Forest. (Credit: Doug Morton)

Understory fires doing long term damage to the Amazon Forest. (Credit: Doug Morton)

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NASA Study reveals degradation of Amazon Forest due to Climate Change

 

Written by Alan Buis
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – An area of the Amazon rainforest twice the size of California continues to suffer from the effects of a megadrought that began in 2005, finds a new NASA-led study.

These results, together with observed recurrences of droughts every few years and associated damage to the forests in southern and western Amazonia in the past decade, suggest these rainforests may be showing the first signs of potential large-scale degradation due to climate change.

The megadrought in the Amazon rainforest during the summer of 2005 caused widespread damage and die-offs to trees, as depicted in this photo taken in Western Amazonia in Brazil. (Image credit: NASA/JPL-Caltech)

The megadrought in the Amazon rainforest during the summer of 2005 caused widespread damage and die-offs to trees, as depicted in this photo taken in Western Amazonia in Brazil. (Image credit: NASA/JPL-Caltech)

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Awkward facts about climatic disruption

 

Cautionary words on climate from a May 1 statement by George Woodwell, the founder and Director Emeritus of The Woods Hole Research Center.

I explore below paths that might, if followed, lead out of the chaos of an open-ended climatic disruption. Unfortunately the issues are complicated, the time for action is now late, and effective action is growing more difficult daily. Effective action is possible, however….

The changes in climate are far more serious than they may appear…. These changes, the warming of the higher latitudes, the destruction of forests, the accelerated decay of organic matter in forests and tundra soils, the melting of permafrost, the change from a reflective frozen white to black open water in the Arctic Ocean, and the warming of the surface water of the oceans all point to an acceleration of the warming trend. These are “positive feedbacks” which dominate as the earth warms and accelerate the disruption. Despite their importance, they have not been included in appraisals that suggest that a two degree average change in the temperature of the earth might be acceptable. The fact is that the feedbacks will almost certainly take the disruption beyond human control well before the temperature rise is two degrees C. Stopping at 2 degrees will not be possible. «Read the rest of this article»

 



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