Avg PO4^3- []'s in the deep and surface ocn's are 2.11 and 0.71umolkg^-1. Calc the residence time of PO4^3- in the deep ocn considering the carbon budget(Figure below) Write the general equation, calculation and units.
------ represents a Box outline
Surface---------------------------------
[P]surface
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(arrows moving up and down through surface and deep) ventilation =4.6 m/y
;;;;=(sinking)
Jc = 5.0Gt/y
deep------------;;;;--------------------
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;;;;=(sinking)
Bc = 0.15Gt/y
sediments-------------------------------
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