Fig. 5: Four-box biogeochemical model results.
From: Marine phosphorus and atmospheric oxygen were coupled during the Great Oxidation Event
a P concentration in the proximal ocean box. b Atmospheric O2 concentration. c Fraction of inorganic carbon that is buried as organic carbon (forg). d, e Isotopic composition of DIC (δ13CDIC) in the proximal, distal and deep- ocean boxes. PAL present atmospheric level. DIC dissolved inorganic carbon. Green shading reflects model sensitivity range for 95% of results. Dashed grey lines in panel b indicate geochemical proxy evidence for atmospheric O2 level and average δ13Ccarb value for the Lomagundi Event.
