The December 2015 North Pole Warming Event and the Increasing Occurrence of Such Events.

Sci Rep · 2016 · PMC5157030 · PMID 27976745

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an increasing trendno p-value reported

6 and clearly reveal an increasing trend in the mean and 99 th percentile values for both the surface air temperature and the precipitable water since the late 1950 s.

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