Greenland Ice Cores Show Temps Were Much Warmer 4,000 Years Ago
Jørgen Peder Steffensen is an ice core research professor at the Niels Bohr Institute at the University of Copenhagen. His team has reconstructed the last 10,000 years of Greenland’s climate history using ice core data.
It bears the fingerprints of climatic conditions of more than 120,000 years.
When they removed the drill from the ice core, they leave a hole and insert a thermometer in the hole to map out the temperature through the three-kilometer ice sheet.
And that temperature, done within a thousandth-of-a-degree accuracy, the ice has not forgotten how cold or warm it was on the surface at the time the snow fell.
So using those temperatures, they reconstructed the temperatures of the last 10,000 years.
They found that if they go back about 4,000 years ago, they have temperatures that were two-and-a-half degrees warmer on average than today.
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