New data suggests the record in recent decades for the highest level of ice to melt in Antarctica in one day was reached on Christmas Eve.
Around 15 per cent of the continent’s surface melted, according to the Global Forecast System (GFS) by the National Centres for Environmental Prediction (NCEP).
The data comes from the Modèle Atmosphérique Régional (MAR), a model used for meteorological and climatic research.
The American publication Newsweek reports Dr Xavier Fettweis, a climatologist at the University of Liège in Belgium, who tweeted the data on Friday, said this is the highest melt extent in Antarctica in the modern era, since 1979.
He added the production of melt water is a record 230 per cent higher than average since November this year.
That’s despite the melting season not yet being over.
For the first time, Dr Fettweis said, the melting seemed to explain a negative anomaly in data on Antarctica’s surface mass balance (SMB).
This is the net balance between what causes a glacier’s surface to grow or deplete, for instance because it evaporates or melts away.
“It should be noted that this process is currently missing in most of SMB estimations over Antarctica as melt has been negligible until now. But the climate is changing…” Dr Fettweis said.
Dr Fettweis told Newsweek Antarctica has been “significantly warmer than average” this melting season.
However, he stressed the data was from a model, and not an in situ observation.
The melting could be driven by a number of factors, and experts would need to wait two to three melting seasons to confirm what was going on.
“We have observed a crash of the Antarctica polar vortex just before this melting season,” explained Dr Fettweis, referring to low pressure near the pole.
“A weaker polar vortex allows warm air masses to reach easier the ice sheet (which is usually protected by its polar vortex as it was the case the previous summer).
“The fact that the sea ice extent is very low also enhances the possibility of warm air masses to reach the ice sheet.”
Asked whether climate change is to blame, he said: “As for most of the anomalies observed on these last months over the Earth such as in Australia, the signal coming from global warming cannot be ignored here.”
Dr Fettweis said Antarctica had been “protected” by global warming, due in part to a stronger polar vortex over this last decade than usual.
However, he said this no longer seems to be the case, and climate anomalies observed at the continent could no longer be used by climate sceptics to deny global warming was occurring.
Dr Eric Holthaus, a meteorologist and fellow at the University of Minnesota’s Institute on the Environment, shared the data on Twitter.
He wrote: “New data indicates that on Christmas Eve, unusually warm weather melted the most ice across the continent of Antarctica in a single day out of any day in recorded history. 15 per cent of the continent’s surface melted, temporarily.
“We are in a climate emergency,” said Dr Holthaus.
Last month, scientists urged world leaders to take urgent action to tackle climate change, as “abrupt” and “irreversible” climate tipping points that threaten human civilization may have already started
In an article published in the journal Nature, scientists highlighted if the likely interconnected tipping points are met, a domino-effect of “long-term irreversible changes” to the planet could be triggered.
“Evidence that tipping points are underway has mounted in the past decade,” the experts wrote.
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