échange de carbone océan-atmosphère

OBS: échange de CO2 océan-atmosphère : s'écrit échange de CO[indice 2] océan-atmosphère.

CONT: Ocean atmosphere carbon exchange. Carbon dioxide ... is a soluble gas [that] dissolves in the oceans and is taken up by marine plants (phytoplankton). A natural cycle results in which CO[subscript 2] is absorbed from the atmosphere in some (generally cooler and more biologically active) parts of the ocean and released back to the atmosphere in other (generally warmer and less biologically active) parts.
OBS: ocean-atmosphere CO2 exchange: written ocean-atmosphere CO[subscript 2] exchange.
OBS: ocean-air CO2 exchange: written ocean-air CO[subscript 2] exchange.