I'm sure whatever affects one ocean will affect all of them either directly or indirectly. With all of the talk of ice melts, where the rise may come from land based ice, that slides into the ocean when once it would have been frozen tight, one of the primary causes of sea level rise will be due to the fact that like all but a few things, water expands when it warms. While the temperature rises may seem small, the volumes involved mean the expansion can be significant. That's not to mention the increased amount of energy held in the water, which can contribute to stronger storms, and rougher seas. The ocean is a big place, and for the temperature to rise by one degree, means a vast amount of energy stored.