The ocean captures and release heat over long periods of time. Thereby providing a central role in stabilizing Earth’s climate system. The ocean heat content shows yearly and decades-long variations, since natural climate patterns, such as El Niño and The Pacific Decadal Oscillation (PDO) influence the heat content but also regional climate.
The Ocean heat content since 1960-2015, Photo soucrce: NASA, Modifief by: ERM-Siam Co., Ltd.
The figure is shown an increase in ocean heat content. The red line is referred to ocean heat content in pentadal average 0-700 m, the blue line is referred to ocean heat content in pentadal average 0-2000 m. Both are shown that ocean heat content has continuously increased (Kennedy, 2015).