15 Apr '11, 10pm

2010 Drought in the Amazon Forest: This vegetation map shows widespread browning over the Amazon rainforest d...

The measurement of vegetation over tropical forests can be tricky. The vegetation index is made by combining the visible and infrared red light the plants reflect back to space. The dense, lush foilage in tropical forests absorbs most visible light, so little visible light makes it back to the satellite, making it more difficult to calculate the vegetation index than in other ecosystems. At the same time, smoke reflects visible light. When there is smoke in the atmosphere during the dry season, the extra reflected light can make it appear that the forest is less healthy than it is. During drought years, smoke can be more of a problem, since fire is more common in the dry conditions and the Amazon can be cloaked in near perpetual smoke.

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=50136&s...

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Graphic: 2010 Drought in the Amazon Forest @NAS...

earthobservatory.nasa.gov 15 Apr '11, 10pm

The measurement of vegetation over tropical forests can be tricky. The vegetation index is made by combining the visible a...

NASA image reveals extent of 2010 Amazon drought ~ @mongabay

NASA image reveals extent of 2010 Amazon drough...

news.mongabay.com 17 Apr '11, 7pm

From NASA: image from the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite, the image shows...

Fishermen have started killing pink dolphins for use as bait to catch catfish

Fishermen have started killing pink dolphins fo...

care2.com 18 Apr '11, 1am

Pink dolphins are found only in the Amazon River and are said to be the most intelligent of the five species of dolphins i...

Tropical countries aim for global forest pact

Tropical countries aim for global forest pact

news.mongabay.com 18 Apr '11, 4am

Tropical countries aim for global forest pact mongabay.com April 18, 2011 Rainforest in Panama. Photo by Rhett A Butler Re...

Forest carbon map released for the US via @mongabay

Forest carbon map released for the US via @mong...

news.mongabay.com 20 Apr '11, 8pm

Birnam Wood in the 21st Century: northern forest invading Arctic tundra as world warms (03/07/2011) In Shakespeare's play ...

Islands off the Croatian Coast [image] #NASA

earthobservatory.nasa.gov 16 Apr '11, 10pm

Along the coast of Croatia lies a multitude of islands of varying shapes and sizes. Archaeological finds indicate that som...