Ocean bottom pressure

The two GRACE satellites are making detailed measurements of Earth's gravity field with a revolutionaring way of investigating Earth's water reservoirs, large-scale solid earth changes, ice cover, and oceans. 

This animation is from the GRACE Tellus project, and aid in the interpretation of gravity change over the oceans, providing ocean bottom pressure (OBP) derived from the GRACE satellites. OBP is the sum of the mass of the atmosphere and ocean in a 'cylinder' above the seafloor.