There is only one ocean; they are all connected. As the polar ice caps melt, the water goes into the ocean and the ocean rises.
You can call it decadaloscillation, blame it on El Niño and La Niña and explain it by hot and cold expansion and contraction, but the fact is the ice is melting and the ocean is rising.
The one item never mentioned is the loss of weight on our poles as the ice melts. It is having an effect on Earth’s rotation, jet stream, water distribution and seasons.
In December 2013, an article published in New Scientist said Earth’s poles are shifting because of climate change, and it might be of interest to believers and nonbelievers of climate change.