“This will result in high temperatures and consequently enhanced melting of the Greenland ice sheet,” she said. “We don’t know yet whether it will beat the 2012 level, but it’s close.”
Nullis cited data from Denmark’s Polar Portal, which measures the daily gains and losses in surface mass of the Greenland Ice Sheet.
“In July alone, it lost 160 billion tonnes of ice through surface melting. That’s roughly the equivalent of 64 million Olympic-sized swimming pools. Just in July. Just surface melt - it’s not including ocean melt as well.”
The Greenland Ice Sheet covers 80% of the island and has developed over many thousands of years, with layers of snow compressed into ice.
The dome of ice rises to a height of 3,000 meters and the total volume of the ice sheet is approximately 2,900,000 cubic kilometres, which would raise global sea levels by 7 metres if it melted entirely, according to the Polar Portal website.
Greenland had not had exceptional weather this year until June, but its ice had been melting rapidly in recent weeks, she said.
The warmer air also had implications for Arctic ice extent, which was nearly the lowest on record as of July 15, Nullis said.
She said increasingly frequent and intense heatwaves were linked to manmade climate change.
“What we saw with this one was that temperature records weren’t just broken, they were smashed.”
She cited a study by the Britain’s Met Office which found that by 2050, record-breaking heatwaves would happen every other year.