Environment & Energy
Related: About this forumAmazon Basin Now Net Carbon/Methane Source, Latest Readings Show
Back in 2005, and again in 2010, the vast Amazon rainforest, which has been aptly described as the worlds lungs, briefly lost its ability to take in atmospheric carbon dioxide. Its drought-stressed trees were not growing and respiring enough to, on balance, draw carbon out of the air. Fires roared through the forest, transforming trees into kindling and releasing the carbon stored in their wood back into the air.
These episodes were the first times that the Amazon was documented to have lost its ability to take in atmospheric carbon on a net basis. The rainforest had become whats called carbon-neutral. In other words, it released as much carbon as it took in. Scientists saw this as kind of a big deal.
This summer, a similar switch-off appears to be happening again in the Amazon. A severe drought is again stressing trees even as it is fanning wildfires to greater intensity than during 2005 and 2010. Early satellite measures seem to indicate that something even worse may be happening the rainforest and the lands it inhabits are now being hit so hard by a combination of drought and fire that the forest is starting to bleed carbon back. This gigantic and ancient repository of atmospheric carbon appears to have, at least over the past two months, turned into a carbon source.
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(High levels of carbon dioxide, in the range of 410 to 412 parts per million, and methane in the atmosphere over the Amazon rainforest during July and August of 2016 is a preliminary indicator that the great forest may be, for this period, acting as a carbon source. Image source: The Copernicus Observatory.)
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In this tragic context of heat, drought, ocean acidification and deforestation, it appears that the grace period that the Earths carbon sinks have given us to get our act together on global warming is coming to an end. Heating the Earth as significantly as we have is causing these sinks to start to break down to be able to draw in less carbon, as was the case with the Amazon rainforest in 2005 and 2010. At these points in time, the sink was carbon-neutral. It was no longer providing us with the helpful service of drawing carbon out of the atmosphere and storing it in trees or soil. But, more ominously, in 2016, it appears that the Amazon may also to be starting to contribute carbon back to the atmosphere.
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(High surface methane readings over the Amazon in excess of 2,000 parts per billion is a drought and wildfire signature. It is also a signal that the rainforest during this period was emitting more carbon than it was taking in. Image source: The Copernicus Observatory.)
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https://robertscribbler.com/2016/08/05/carbon-sinks-in-crisis-it-looks-like-the-worlds-largest-rainforest-is-starting-to-bleed-greenhouse-gasses/
CrispyQ
(36,413 posts)Our "news" channels focus on every stupid, mean thing Donald Trump says & not a word on stories like this. They are complicit. I wonder if some of today's windbags will ever look back & think, "Damn, I should have done my job!"
n2doc
(47,953 posts)And unfortunately it will probably take a great deal of mass suffering to get the world to wake up. I hope it doesn't come to that, but I suspect it will.
OKIsItJustMe
(19,937 posts)[font size=5]Stanford scientists find Amazon rain forest responds quickly to extreme climate events[/font]
[font size=4]The carbon balance in the Amazon can change quickly in response to heat and drought conditions.[/font]
By Ker Than
[font size=3]A new study examining carbon exchange in the Amazon rain forest following extremely hot and dry spells reveals tropical ecosystems might be more sensitive to climate change than previously thought.
The findings, published online on April 28 in the journal Global Change Biology, have implications for the fate of the Amazon and other tropical ecosystems if greenhouse gas emissions continue to climb.
It was already known that the 2010 drought had caused large carbon loss from the Amazon. However, the more detailed information developed in the new study allowed the researchers to analyze both the carbon and climate conditions that occurred in different parts of the Amazon as the drought evolved. This new analysis suggests that the loss of carbon may have preceded the onset of drought conditions, when the climate was unusually hot but not yet unusually dry.
The group also found that in the eastern Amazon, CO₂ was still being emitted to the atmosphere in large pulses throughout 2011, months after the severe heat and drought events had occurred. This legacy effect could indicate that tropical rainforests can take several years to recover from a major drought, Alden said.
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See also: http://www.democraticunderground.com/1127103150
NNadir
(33,457 posts)...the Amazon all better.
If Press releases from academic institutions counted, all those "solar breakthrough" announcements we've been hearing here for more than a decade would have saved the world.
They did nothing. We are in the worst position for climate change in which we have ever been.