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New paper: Arctic temperatures peaked before 1950, declining since

November 19, 2013

Watts Up With That?

New paper using Oxygen 18 isotope tracking finds the Arctic temperatures peaked before 1950, and have been stable to declining since. Natural variability is cited as the cause.

A new paper published in Climate of the Past reconstructs temperatures over the past 1100 years from Eastern Arctic ice cores. The dating was done by Oxygen 18 isotope dating and the O18 data shows the highest Eastern Arctic temperatures of the 20th century occurred in the 1920’s-1940’s. The data shows that after that peak, there was a cooling or a warming ‘pause’ over the remainder of the 20th century.

The peak in the 1920’s likely explains this classic WUWT post showing observations from 1922:

The Arctic ocean is warming up, icebergs are growing scarcer and in some places the seals are finding the water too hot, according to a report to the Commerce Department yesterday from Consul Ifft, at Bergen, Norway.

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