Multidecadal Oscillations in the Pacific and the Atlantic are acknowledged to be the result of natural processes. We have shown the warm phase of the PDO leads to more El Ninos and general warmth and the cold phase to more La Ninas and widespread coolness. The warm mode of the AMO also produces general warmth across much of the Northern Hemisphere including Greenland and the Arctic. When you combine the two cycles, you can explain much of the temperature variances of the past 110 years for the United States, Greenland and the Arctic.
Warm waters from both ocean basins during the ocean’s warm modes contribute to periodic summer ice decreases approximately every 60 years going back two hundred years.
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