Fig. 6. Model fits (solid lines) to the profiles of porewater phosphate, organic P (equal to Pres), Fe-bound P (PFe), authigenic P (equal to PNH4Cl 1 PCFA), and the sum of these three solid phase P fractions. The horizontal dotted line indicates the depth of bioturbation. The vertical solid line in the authigenic P profiles represents the PNH4Cl 1 PCFA concentration which is not related with in situ authigenic P formation (i.e. P associated with fish debris or carbonates, easily exchangeable P, or redeposited francolite). The vertical dotted lines represent the scenario where limited francolite formation takes place (i.e.ka 1026; leaving all other parameters the same).
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