A sharp spike in Greenland temperatures since 1995 showed the giant northern island is 2.7 degrees (1.5 degrees Celsius) hotter than its 20th-century average.
A sharp spike in Greenland temperatures since 1995 showed the giant northern island is 2.7 degrees hotter than its 20th-century average, the warmest in more than 1,000 years, according to new ice core data.
“We keep on rising temperatures between 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.” The ice cores are used to make a chart of proxy temperatures for Greenland running from the year 1000 to 2011. It shows temperatures gently sloping cooler for the first 800 years, then wiggling up and down while sloping warmer until a sharp and sudden spike hotter from the 1990s on. One scientist compared it to a hockey stick, a description used for other long-term temperature data showing climate change.
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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New ice core analysis shows sharp Greenland warming spikeA sharp spike in Greenland temperatures since 1995 showed the giant northern island 2.7 degrees (1.5 degrees Celsius) hotter than its 20th-century average, the warmest in more than 1,000 years, according to new ice core data.
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