This is a data sonification of the amount of energy absorbed by the world's oceans between 1980 and 1989. For a given three-month period, if more energy was absorbed, the chord being played is denser and sparser if less was absorbed. The pitches are selected from the 11-limit tonality diamond.

There's more about it in the "Info" section on the web piece, which plays 1970-2025, and on the Bandcamp page.