Climate Pacemaker: The AMOC

Science Matters

We hear a lot about CO2 as climate’s “control knob, but about the oceans’ pacemaker, AMOC? Not so much.

In the Water World post, I referenced the match between SSTs (sea surface temperatures) as recorded in HadISSAT and the IPO, an index of SSTs in the Eastern Pacific: North, Central and South. This is a brief discussion of the Atlantic role in shaping climate patterns, especially in Europe and North America.

The Big Picture

Since global average temperatures are dominated by the oceans as measured by SSTs, it is significant that multidecadal cycles are presently shifting from warmer phases to cooler. The PDO entered its cooler period recently, and the current weak El Nino is evidence of this. (Pacific Decadal Oscillation is an index of Northeastern Pacific based upon ~30-year periods, warm when El Ninos dominate, and cool when La Ninas rule.)

Atlantic Multidecadal Oscillation (AMO). Source: http://www.appinsys.com/globalwarming/SixtyYearCycle.htm

Now the…

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