NO, Concentration (um) 0.25 3.25 + POA Concentration (um) 0.0125 0.20 + 10 10 20 20 depth (m) 30 30 40 40 50 50 If the surface mixed layer is 20 meters deep and the primary productivity in the surface mixed layer is 10 mg Cm day (on average), estimate how long it would take before the phytoplankton ran out of nutrients? Which nutrient is limiting? Hints: The atomic masses of carbon, nitrogen and phosphorus are 12, 14, and 31 g/mole, respectively. One cubic meter equals 1000 liters. uM is the same as umol/L. You will need to use the Redfield ratio