Sources of Phosphorus to Estuaries

The cycling and availability of P in estuaries is largely dependent upon P speciation. Consequently, total P (TP) has traditionally been divided into total dissolved P (TDP) and total particulate P (TPP) fractions (Juday et al., 1927), which can further be divided 

Reservoir Reservoir amount, A (mol x 10-12) Y Fluxes (mol area-1 x 10-12) Residence time (years) 

POP (0.5 soil derived 0.4 shale derived) PIP, Fe-bound (P adsorbed to 0.9 (maximum) 

Total river + Eolian phosphorus flux Total prehuman potentially reactive 10.8-17.8 

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