Fig. 2: Nonlinear effects on CFA, total P burial, and Corg/Preac.
From: The role of calcium in regulating marine phosphorus burial and atmospheric oxygenation
PCFA (circles) represents burial concentration of CFA-associated phosphorus in marine sediments. BE (diamonds) represents the burial efficiency of reactive phosphorus in marine sediments. Corg/Preac represents the burial ratio between organic carbon and reactive P. a–d The effects upon PCFA, BE, and Corg/Preac of bottom-water oxygen concentration a, seawater dissolved calcium concentration b, flux of organic carbon to the sediment–seawater interface (Joc) c, and bioturbation d. For bioturbation, the four parameters included in the model (DB0, a0, xbt, and xbi) were increased linearly from zero to modern average values, whereas a linear increase of 16% was applied to porosity. Bioturbation is parameterized here as a coupled biodiffusion and bioirrigation term. See Supplementary Tables 1–5 for full list of model parameters.
