1) O2 fluxes occur from ocean to atmosphere and vice-versa; 2) These fluxes are regionally dependent, with high latitudes
mostly seeing O2
moving from atmosphere to ocean, and the tropics seeing the opposite pattern; 3) Fluxes are driven by both thermal and biological processes; 4) Globally, the atmosphere loses about 49 Tmol yr - 1; this
sounds large but is described by the authors as «relatively small.»