Antarctica’s ‘Doomsday Glacier’ is not only losing ice rapidly from climate change, but it’s getting a double whammy from the heat of the Earth itself, a new study suggests.
The Thwaites Glacier — which has been called the ‘Doomsday Glacier’ due to its impact on sea level rise — is being hit with heat from the Earth’s crust, as it is only 10 to 15 miles deep below West Antarctica, compared to around 25 miles in East Antarctica.
The ‘Doomsday Glacier’ is being hit with heat from the Earth’s crust and climate change
The Earth’s crust is only 10-15 miles deep under West Antarctica, where the Thwaites Glacier (pictured) is located, compared to 25 miles in East Antarctica
This results in an a ‘geothermal heat flow of up to 150 milliwatts per square meter,’ the study’s lead author, Dr Ricarda Dziadek, said in a statement.
According to the BBC, the Thwaites glacier contributes roughly four percent to annual sea-level rise and is now believed to be losing 80 billion tons of ice per year.
Since 1980, it has lost at least 600 billion tons of ice, according to a 2017 analysis done by the New York Times, using data from NASA JPL.
This causes a ‘geothermal heat flow of up to 150 milliwatts per square meter’ and additional heating on the glacier
Thwaites contributes roughly 4% to annual sea-level rise and is now losing 80 billion tons of ice per year. Since 1980, it has lost at least 600 billion tons of ice, experts said previously
Some of the accelerated sea ice loss can be attributed to hidden rivers under the glacier, according to Live Science, but most of it is related to climate change and rising temperatures.
The researchers looked at geomagnetic field datasets of West Antarctica to create new geothermal heat flow maps.
If Thwaites melted completely, it could cause more than six feet of potential sea level rise
These showcase how important the second, but just as important, factor is on the glacier and its subsequent ice loss, even if the exact impact is presently unclear.
‘The temperature on the underside of the glacier is dependent on a number of factors – for example whether the ground consists of compact, solid rock, or of meters of water-saturated sediment,’ explained co-author and AWI geophysicist Dr Karsten Gohl.
‘Water conducts the rising heat very efficiently. But it can also transport heat energy away before it can reach the bottom of the glacier.’
In 2020, researchers obtained the first-ever footage of the underside of the glacier, showing turbulent warm waters under the ice sheet that are causing an ‘unstoppable retreat.’
The temperature of Earth’s crust can vary depending upon location, but it can range between 200C (392F) to 400C (752F) near the Moho, according to National Geographic.
The team found that the heat flow from the Earth’s crust is imperative to look at when thinking about its future.
‘Large amounts of geothermal heat can, for example, lead to the bottom of the glacier bed no longer freezing completely or to a constant film of water forming on its surface,’ Gohl added.
‘Both of which would result in the ice masses sliding more easily over the ground. If, in addition, the braking effect of the ice shelf is lost, as can currently be observed in West Antarctica, the glaciers’ flow could accelerate considerably due to the increased geothermal heat.’
The enormous basin contains more than six feet of additional potential sea level rise and a significant melting could result in the Thwaites Glacier living up to its ‘doomsday’ name.
The research was published Thursday in the journal Communications Earth & Environment.
THE RETREAT OF THE THWAITES GLACIER
The Thwaites glacier is slightly smaller than the total size of the UK, approximately the same size as the state of Washington, and is located in the Amundsen Sea.
It is up to 4,000 metres (13,100 feet thick) and is considered a key in making projections of global sea level rise.
The glacier is retreating in the face of the warming ocean and is thought to be unstable because its interior lies more than two kilometres (1.2 miles) below sea level while, at the coast, the bottom of the glacier is quite shallow.
The Thwaites glacier is the size of Florida and is located in the Amundsen Sea. It is up to 4,000 meters thick and is considered a key in making projections of global sea level rise
The Thwaites glacier has experienced significant flow acceleration since the 1970s.
From 1992 to 2011, the centre of the Thwaites grounding line retreated by nearly 14 kilometres (nine miles).
Annual ice discharge from this region as a whole has increased 77 percent since 1973.
Because its interior connects to the vast portion of the West Antarctic Ice Sheet that lies deeply below sea level, the glacier is considered a gateway to the majority of West Antarctica’s potential sea level contribution.
The collapse of the Thwaites Glacier would cause an increase of global sea level of between one and two metres (three and six feet), with the potential for more than twice that from the entire West Antarctic Ice Sheet.