The ocean carbon cycle is represented by fluxes (yellow arrows), which include the annual net transfer of carbon dioxide (CO2) between the atmosphere and ocean surface. The carbon inventory (rectangles) indicates that the deep ocean is a large storage reservoir and important to the Earth’s climate system.
Source
Riccardo Pravettoni, UNEP/GRID-Arendal, <http://www.grida.no/resources/7555>
