Changes in sea surface height can indicate the amount of heat in the ocean because the ocean expands when it is heated and contracts when it is cooled. (oceanmotion.org)
Using the satellite observations, compiled by the leading sea level research group's site, one can download sea surface height anomalies from the beginning of the 21st century. (c3headlines.com)
Then how do you explain the gravity / sea surface height data? (realclimate.org)