Is a Planet's Protective Bubble from Solar Emissions a Prerequisite to Habitability?
New Light on Our Accelerating Universe --"Not as Fast as We Thought"

Volcano-Powered Ocean Acidification Caused the Planet's Greatest Mass Extinction





"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, said Matthew Clarkson, of the University of Edinburgh's School of GeoSciences. "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."

Changes to the Earth's oceans, caused by extreme volcanic activity, triggered the greatest extinction of all time, a new study suggests. The event, which took place 252 million years ago, wiped out more than 90 per cent of marine species and more than two-thirds of the animals living on land.

It happened when Earth's oceans absorbed huge amounts of carbon dioxide from volcanic eruptions, researchers say.
This changed the chemical composition of the oceans - making them more acidic - with catastrophic consequences for life on Earth, the team says.

The study, co-ordinated by the University of Edinburgh, is the first to show that highly acidic oceans were to blame.
The findings are helping scientists understand the threat posed to marine life by modern-day ocean acidification. The amount of carbon added to the atmosphere that triggered the mass extinction was probably greater than today's fossil fuel reserves, the team says.

However, the carbon was released at a rate similar to modern emissions. This fast rate of release was a critical factor driving ocean acidification, researchers say. 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.

Ocean acidification was the driving force behind the deadliest phase of the extinction, which dealt a final blow to an already unstable ecosystem, researchers say. Increased temperatures and widespread loss of oxygen in the oceans had already put the environment under pressure.

Oceans can absorb some carbon dioxide but the large volume released - at such a fast rate - changed the chemistry of the oceans, the team says.

The mass extinction of both marine and land-based animals demonstrates that extreme change took place in all of Earth's ecosystems, the team says.

The team analysed 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.

The study, published in the journal Science, was carried out in collaboration with the University of Bremen, Germany, and the University of Exeter, together with the Universities of Graz, Leeds, and Cambridge.

Funding was provided by the International Centre for Carbonate Reservoirs, Natural Environment Research Council, The Leverhulme Trust, German Research Foundation and the Marsden Fund.

The Daily Galaxy via University of Edinburgh

Image credit: With special thanks to photographer Miles Morgan


This makes more sense than man-made global warming. If it is true.

This showes one thing qquite clearly: what ever we might think is the truth... the last word isn't spoken ... yet.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Your comment could not be posted. Error type:
Your comment has been posted. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.


Post a comment

Your Information

(Name is required. Email address will not be displayed with the comment.)