Even very small changes in ocean volume add up to a lot of sea level rise. (skepticalscience.com)
Consider that oceans surface water is a tiny part of the complete ocean volume. (dotearth.blogs.nytimes.com)
These estimates were made based on the various contributors to sea level rise: thermal expansion of ocean volume as a result of warming, the melting of glaciers and Greenland and Antarctic ice sheets, changing ocean dynamics such as the slowing of the Gulf Stream, and vertical land movement. (sciencedaily.com)