"Many Photos" - Scientists to start drilling in Antarctica and searching for the 'oldest ice in the world'

A project to begin drilling for the oldest ice in the world on the east Antarctica ice sheet has officially got the go-ahead.

The ambitious mission's aim is to provide a continuous record of Earth's atmosphere and climate stretching back 1.5 million years.

Researchers will study bubbles of carbon dioxide and other gases trapped inside ice cores up to 1.8 miles (3km) long in the hope of understanding more about Earth's past climate. 

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A project to begin drilling for the oldest ice in the world on the east Antarctica ice sheet has officially gotten the go-ahead. The ambitious mission's aim is to give a continuous record of Earth's atmosphere and climate stretching back 1.5 million years

A 14-person team will go to Antarctica in December on the £11 million (€13 million) Beyond EPICA project, involving 14 institutions from ten countries, to begin drilling into the ice.

Ice buried deep within the ice sheet on Antarctica preserves these historic clues and the team hope the material will help them understand Earth's climate flipped, known as the mid-Pleistocene transition.

This period saw the world shift from a rhythm of switching between warm and cold phases every 40,000 years, to a cycle every 100,000 years. 

The expedition hopes to shed light on why this happened and how much the world is likely to warm in the years ahead. 

Researchers will use the bubbles of carbon dioxide and other gases trapped inside ice cores to provide a window into the Earth's past climate. A 14-person team will go to Antarctica in December on the £11 million (€13 mn) Beyond EPICA project

Ice buried deep within the ice sheet on Antarctica preserves clues to past climatic change dating back more than a million years. The team hope that this material will give them clues for why Earth's ice ages flipped, known as the mid-Pleistocene transition

This period saw the world shift from a rhythm of switching between warm and cold phases every 40,000 years, to a cycle every 100,000 years. The expedition hopes to shed light on why this happened and how much the world is likely to warm in the years ahead

'Something happened about 900,000 years ago. The ice age cycles changed from every 40,000 years or so, to every 100,000 years; and we don't know why,' Doctor Catherine Ritz from the Institute of Environmental Geosciences in Grenoble, France, told BBC News.

'And it's rather important, because if we want to forecast what will happen to the climate in the future, with the increase in greenhouse gases, then we will have to use models, and these models will be calibrated on what happened in the past.'

The team have spent the past three years using radar to look below the ice, searching for the best place to drill.

They found that a site known as Little Dome C is the most likely to yield ice.

The whole process will take around six years to complete; five to fully extract the core and at least a further year to examine the ice. 

The oldest ice ever to be drilled was unearthed 15 years ago and dates back 800,000 years but this misses the mid-Pleistocene transition, which took place approximately 1.25 million to 700 thousand years ago.

The team say they are confident they will find ice old enough but they said there is no guarantee it will go back as far as they'd like. 

WHAT DO RECENT STUDIES REVEAL ABOUT ANTARCTICA?

A special issue of Nature has published a series of studies looking at how monitoring Antarctica from space is providing crucial insights into its response to a warming climate. 

Here are their key findings: 

Three trillion tonnes of ice has been lost from Antarctica since 1992

The Antarctic Ice Sheet lost around three trillion tonnes of ice between 1992 and 2017, according to research led by Leeds University.

This figure corresponds to a mean sea-level rise of about eight millimetres (1/3 inch), with two-fifths of this rise coming in the last five years alone.

The finds mean people in coastal communities are at greater risk of losing their homes and becoming so-called climate refugees than previously feared.

In one of the most complete pictures of Antarctic ice sheet change to date, an international team of 84 experts combined 24 satellite surveys to yield the results.

It found that until 2012 Antarctica lost ice at a steady rate of 76 billion tonnes per year - a 0.2mm (0.008 inches) per year contribution to sea level rise.

However, since then there has been a sharp, threefold increase.

At some point since the last Ice Age, the West Antarctic Ice Sheet was smaller than it is today

Researchers previously believed that since the last ice age, around 15,000 years ago, the West Antarctic Ice Sheet (WAIS) was getting smaller

However, new research published by Northern Illinois University shows that between roughly 14,500 and 9,000 years ago, the ice sheet below sea level was even smaller than today.

Over the following millennia, the loss of the massive amount of ice that was previously weighing down the seabed spurred an uplift in the sea floor.

Then the ice sheet began to regrow toward today's configuration.

'The WAIS today is again retreating, but there was a time since the last Ice Age when the ice sheet was even smaller than it is now, yet it didn't collapse,' said Northern Illinois University geology professor Reed Scherer, a lead author on the study.

'That's important information to have as we try to figure out how the ice sheet will behave in the future', he said. 

The East Antarctic Ice Sheet was stable throughout the last warm period

The stability of the largest ice sheet on Earth is an indication to scientists that it could hold up as temperatures continue to rise.

If all the East Antarctic Ice Sheet melted, the sea level would rise by 175 feet (53 metres).

However, unlike the Greenland and West Antarctic ice sheets it seems it would be resistant to melting as conditions warm, according to research from Purdue University and Boston College.

Their research showed that land-based sectors of the East Antarctic Ice Sheet were mostly stable throughout the Pliocene (5.3 to 2.6 million years ago).

This is when carbon dioxide concentrations in the atmosphere were close to what they are today - around 400 parts per million.

'Based on this evidence from the Pliocene, today's current carbon dioxide levels are not enough to destabilise the land-based ice on the Antarctic continent,' said Jeremy Shakun, lead author of the paper and assistant professor of earth and environmental science at Boston College.

'This does not mean that at current atmospheric carbon dioxide levels, Antarctica won't contribute to sea level rise.

'Marine-based ice very well could and in fact is already starting to contribute, and that alone holds an estimated 20 meters of sea level rise,' he said.

Decisions in the next decade will determine whether Antarctica contributes to a metre of sea level rise

One of the largest uncertainties in future sea-level rise predictions is how the Antarctic ice sheet reacts to human-induced global warming.

Scientists say that time is running out to save this unique ecosystem and if the right decisions are not made in the next ten years there will be no turning back.

Researchers from Imperial College London assessed the state of Antarctica in 2070 under two scenarios which represent the opposite extremes of action and inaction on greenhouse gas emissions.

Under the high emissions and low regulations narrative, Antarctica and the Southern Ocean undergo widespread and rapid change, with global consequences.

By 2070, warming of the ocean and atmosphere has caused dramatic loss of major ice shelves, leading to increased loss of grounded ice from the Antarctic Ice Sheet and an acceleration in global sea level rise.

Under the low emissions and tight regulations narrative, reduction of greenhouse gas emissions and implementation of effective policy helps to minimise change in Antarctica, which in 2070 looks much like it did in the early decades of the century.

This results in Antarctica's ice shelves remaining intact, slowing loss of ice from the ice sheet and reducing the threat of sea level rise.

What saved the West Antarctic Ice Sheet 10,000 years ago will not save it today

The retreat of the West Antarctic ice masses after the last Ice Age was reversed surprisingly about 10,000 years ago, scientists found.

In fact it was the shrinking itself that stopped the shrinking: relieved from the weight of the ice, the Earth crust lifted and triggered the re-advance of the ice sheet.

According to research from the Potsdam Institute for Climate Impact Research (PIK) this mechanism is much too slow to prevent dangerous sea-level rise caused by West Antarctica's ice-loss in the present and near future.

Only rapid greenhouse-gas emission reductions can, researchers found.

'The warming after the last Ice Age made the ice masses of West Antarctica dwindle,' said Torsten Albrecht from the Potsdam Institute for Climate Impact Research.

'Given the speed of current climate-change from burning fossil fuels, the mechanism we detected unfortunately does not work fast enough to save today's ice sheets from melting and causing seas to rise.'

The world's ice shelves may be being destabilised by forces from above and below

Researchers found that warm ocean water flowing in channels beneath Antarctic ice shelves is thinning the ice from below so much that the ice in the channels is cracking.

Surface meltwater can then flow into these fractures, further destabilising the ice shelf and increasing the chances that substantial pieces will break away.

The researchers, led by the University of Texas at Austin, documented this mechanism in a major ice break up, or calving, event in 2016 at Antarctica's Nansen Ice Shelf.

The findings are concerning because ice shelves, which are floating extensions of continental glaciers, slow down the flow of ice into the ocean and help control the rate of sea level rise, according to the study.

'We are learning that ice shelves are more vulnerable to rising ocean and air temperatures than we thought,' said Professor Christine Dow, lead author of the study.

'There are dual processes going on here. One that is destabilising from below, and another from above.

'This information could have an impact on our projected timelines for ice shelf collapse and resulting sea level rise due to climate change', he said.

 

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