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Earth’s greatest extinction event happened in a one-two punch 252 million years ago. Research now suggests that the second pulse of extinction, during which nearly all marine species vanished from the planet, happened in the wake of huge volcanic eruptions that spewed out carbon dioxide and made the oceans more acidic.
The Permian-Triassic Boundary extinction took place over a 60,000 year period, researchers say. Acidification of the oceans lasted for around 10,000 years.
The team analyzed rocks unearthed in the United Arab Emirates - which were on the ocean floor at the time - to develop a climate model to work out what drove the extinction. The rocks preserve a detailed record of changing oceanic conditions at the time.
Dr Matthew Clarkson, of the University of Edinburgh's School of GeoSciences, who coordinated the study, said: "Scientists have long suspected that an ocean acidification event occurred during the greatest mass extinction of all time, but direct evidence has been lacking until now. This is a worrying finding, considering that we can already see an increase in ocean acidity today that is the result of human carbon emissions."
A new study led by scientists with The University of Texas at Arlington demonstrates for the first time how elemental carbon became an important construction material of some forms of ocean life after one of the greatest mass extinctions in the history of Earth more than 252 million years ago.
"Much of the volcanic activity was connected with the extensive Siberian flood basalt known as the Siberian Traps that emerged through Permian aged coal deposits and, of course, the burning of coal created CO2," Nestell said.
in the wake of huge volcanic eruptions that spewed out carbon dioxide and made the oceans more acidic.
originally posted by: ANNED
CO2 had very little to do with the Permian–Triassic extinction event.
CO2 was about 3000 ppm.
But you had high methane releases along with toxic levels of hydrogen sulfide.
plus a lot of Sulfur dioxide that is a lot worse at increasing acidity of the oceans.
Where was also low levels of O2 less then half of the levels now. around 10%
This story is just a another scare story from the AGW people and has few real facts behind it and a lot of BS.
Suggested mechanisms for the latter include one or more large bolide impact events, massive volcanism, coal or gas fires and explosions from the Siberian Traps,and a runaway greenhouse effect triggered by sudden release of methane from the sea floor due to methane clathrate dissociation or methane-producing microbes known as methanogens; possible contributing gradual changes include sea-level change, increasing anoxia, increasing aridity, and a shift in ocean circulation driven by climate change.
The extinction primarily affected organisms with calcium carbonate skeletons, especially those reliant on stable CO2 levels to produce their skeletons, for the increase in atmospheric CO2 led to ocean acidification.
In addition, an increase in CO2 concentration leads to ocean acidification, consistent with the preferential extinction of heavilyt calcified taxa and signals in the rock record that suggest a more acidic ocean.