The PDO manifests as cool upwelling in the northeast Pacific — the upwelling brings with it cold bottom water and associated nutrients which results in decadal shifts in biological activity (e.g. Mantua, 1997). (watertechbyrie.com)
Research shows that decadal shifts of subsurface Atlantic Water temperatures, along the North Atlantic Current, are associated with a progression of heat anomalies from the Gulf Stream region that coincide with sea surface temperatures extending to cover most of the subpolar and tropical North Atlantic; a signal similar to that of the Atlantic Multidecadal Oscillation. (usclivar.org)
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