Antarctica Reveals Ancient Sea Level Rise of up to 20 Meters
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July 22, 2013

Antarctica Reveals Ancient Sea Level Rise of up to 20 Meters

 

 

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"The Pliocene Epoch had temperatures that were two or three degrees higher than today and similar atmospheric carbon dioxide levels to today, says Dr Tina Van De Flierdt, co-author from the Department of Earth Science and Engineering at Imperial College London. "Our study underlines that these conditions have led to a large loss of ice and significant rises in global sea level in the past. Scientists predict that global temperatures of a similar level may be reached by the end of this century, so it is very important for us to understand what the possible consequences might be.

The researchers, from Imperial College London, and their academic partners studied mud samples to learn about ancient melting of the East Antarctic ice sheet. They discovered that melting took place repeatedly between five and three million years ago, during the Pliocene Epoch, which may have caused sea levels to rise approximately ten meters that saw similar rises in the ice sheets of West Antarctica and Greenland of up to 20 meters.

Understanding this glacial melting during the Pliocene Epoch may give us insights into how sea levels could rise as a consequence of current global warming. This is because the Pliocene Epoch had carbon dioxide concentrations similar to now and global temperatures comparable to those predicted for the end of this century."

The East Antarctic ice sheet is the largest ice mass on Earth, roughly the size of Australia. The ice sheet has fluctuated in size since its formation 34 million years ago, but scientists have previously assumed that it had stabilised around 14 million years ago.

The team in today's study were able to determine that the ice sheet had partially melted during this "stable" period by analysing the chemical content of mud in sediments. These were drilled from depths of more than three kilometres below sea level off the coast of Antarctica.

Analysing the mud revealed a chemical fingerprint that enabled the team to trace where it came from on the continent. They discovered that the mud originated from rocks that are currently hidden under the ice sheet. The only way that significant amounts of this mud could have been deposited as sediment in the sea would be if the ice sheet had retreated inland and eroded these rocks, say the team.

The academics suggest that the melting of the ice sheet may have been caused in part by the fact that some of it rests in basins below sea level. This puts the ice in direct contact with seawater and when the ocean warms, as it did during the Pliocene, the ice sheet becomes vulnerable to melting.

"Scientists previously considered the East Antarctic ice sheet to be more stable than the much smaller ice sheets in West Antarctica and Greenland, even though very few studies of East Antarctic ice sheet have been carried out," says 
Carys Cook, a co-author with Grantham Institute for Climate Change at Imperial. "Our work now shows that the East Antarctic ice sheet has been much more sensitive to climate change in the past than previously realised. This finding is important for our understanding of what may happen to the Earth if we do not tackle the effects of climate change."

The next step will see the team analysing sediment samples to determine how quickly the East Antarctic ice sheet melted during the Pliocene. This information could be useful in the future for predicting how quickly the ice sheet could melt as a result of global warming.

The Daily Galaxy via Imperial College London

Image Credit: NASA

Comments

Interestingly enough, at this point East Antarctica seems to be cooling slightly. The only detected warming is on the peninsula, which is the west side.

Yeah were on a downward drop again, have been since the 70's. But its small fluctuations.
The ice cores we rely on can't provide a decent comparison against modern day measurements as they don't date back far enough to be accurate.
But I think its pretty obvious were such an inconsiderate and selfish species also locked into capitalist ideals, media and commercialization, were unlikely to pull back enough to prevent any possible global disaster.
Gotta keep trying but it's the governments making inadequate gestures to appease us that's really going to screw us over, don't believe the hype and protest were you can, gotta keep increasing the pressure and avoid banks :p hit em where it hurts


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