AMO & PDO Cycles


By Paul Homewood


It is well established that both the Atlantic Multidecadal & the Pacific Decadal Oscillations affect global temperatures. According to NOAA, the AMO alternatively obscures and exaggerates global warming.




And Roy Spencer tells us :


The Pacific Decadal Oscillation (PDO) is an internal switch between two slightly different circulation patterns that occurs every 30 years or so in the North Pacific Ocean. It was originally described in 1997 in the context of salmon production. It has a positive (warm) phase that tends to warm the land masses of the Northern Hemisphere, as well as a negative (cool) phase.




Things get particularly interesting though, when you put the two cycles together, as below.




  • In the 1930’s, both PDO and AMO warm phases come together.
  • Both cold phases come together in the 1960’s and 70’s, the time of the…

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