How are decadal oscillations linked to global warming?

To put if briefly, decadal oscillations are the recurring patterns and fluctuations of temperatures of ocean surfaces over the Pacific Ocean. It will either be in a ‘negative phases’ and ‘positive phases’ and it will fluctuate every 20 to 30 years. A negative phase is associated with oceanic cooling, mixing of deep waters and surface waters. A warmer phases seems to increase global warming, increasing global and oceanic temperatures. If an El Niño or La Niña event coincides, the effects can be amplified.