A sharp spike in Greenland temperatures since 1995 showed the giant northern island 1.5 C hotter than its 20th-century average, according to new ice core data.
New ice core study shows clear signal of warming, explains why it hadn't been seen beforeIce calves in front of Russel Glacier, Kangerlussuaq, Greenland, at the end of July 2022. A new study shows Greenland is warmer than it's been in 1,000 years.
But the ice cores also hadn't been updated since 1995. Newly analyzed cores, drilled in 2011, show a dramatic rise in temperature in the previous 15 years, according to"We keep on rising temperatures between the 1990s and 2011," said study lead author Maria Hoerhold, a glaciologist at the Alfred Wegener Institute in Germany. "We have now a clear signature of global warming.
Glaciologist Johannes Freitag holds an ice core at the AWI lab. The team drilled five new cores and used the difference between two different types of oxygen isotopes found in the ice to calculate temperature. What had been happening in Greenland is that natural weather variability, undulations because of an occasional weather system called Greenland blocking, in the past had masked human-caused climate change, Hoerhold said.Past data also showed Greenland not warming as fast as the rest of the Arctic, which is now warming four times faster than the global average. But the island appears to be catching up.
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