I considered the relation between carbon dioxide (CO2) and the oceans as a surface or interface phenomena. The oceans are remarkably shallow in relation to the lateral extent. Similarly the atmosphere is remarkably thin.
The dominant common physical attribute is the vast surface area. The dominant driving force is the sun.
The oceans breathe carbon dioxide in and out every day. The sun warms the ocean surface and CO2 is released. The oceans cool at night and absorb CO2. It is the same with the seasons and the El Nino/ La Nina events.
Former Dean of Engineering (1976-1988) and Pro-Vice Chancellor of Monash University
This note and illustration from Lance Endersbee follow an earlier post entitled ‘Atmospheric Carbon Dioxide Levels Follow Sea Surface Temperatures’ and can be read here: http://www.jennifermarohasy.com/blog/archives/002303.html