Shown to the right is a box model of an ocean-atmosphere system. J denotes particulate organic...

 

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Shown to the right is a box model of an ocean-atmosphere system. J denotes particulate organic matter export from the surface mixed layer to the deep ocean via the biological pump. The model assumes that: o the system is in steady state, and each box is thoroughly mixed; o the rate of mixing between the surface and deep ocean, Vmix, is 6.05 x 104 m/xr; o river input and sedimentation are small enough to be ignored (don't add river input and burial arrows into the model!); atmosphere O surface mixed layer Vmix o the surface mixed layer is in equilibrium with the atmosphere at all times (saturated with atmospheric gases); o C:N:P:(-0) stoichiometry during respiration follows Eq 6.24 of Emerson and Hedges (2008); and o the density of seawater is 1.000 kg/L for both surface and deep boxes for ease of calculation. Note that this also means that 1 mol/kg = 1 mmol/m. 106CO2 + 16HNO3 + H3PO4 + 80H2O C106H179038N16P(OM) + 1530. deep ocean (6.24) Please answer the following. Pay close attention to units! a) Temperature and salinity of the surface mixed layer are 5C and 35, respectively. Please report the dissolved O concentration in the surface ocean in units of mol kg. b) The DIP concentration in the surface mixed layer and deep ocean are 0.3 mol kg- and 1.8 mol kg-, respectively. At what rate is P exported out of the surface box in the form of particulate organic matter (i.e., what is the value of Jp)? Report your answer in units of mol-P yr. c) What is the concentration of dissolved O in the deep ocean? Please report your answer in mol kg- (1) You can construct a budget for O in the deep ocean, then link it to P through stoichiometry. (2) Find AOU using known values of O and DIP. Vmix Shown to the right is a box model of an ocean-atmosphere system. J denotes particulate organic matter export from the surface mixed layer to the deep ocean via the biological pump. The model assumes that: o the system is in steady state, and each box is thoroughly mixed; o the rate of mixing between the surface and deep ocean, Vmix, is 6.05 x 104 m/xr; o river input and sedimentation are small enough to be ignored (don't add river input and burial arrows into the model!); atmosphere O surface mixed layer Vmix o the surface mixed layer is in equilibrium with the atmosphere at all times (saturated with atmospheric gases); o C:N:P:(-0) stoichiometry during respiration follows Eq 6.24 of Emerson and Hedges (2008); and o the density of seawater is 1.000 kg/L for both surface and deep boxes for ease of calculation. Note that this also means that 1 mol/kg = 1 mmol/m. 106CO2 + 16HNO3 + H3PO4 + 80H2O C106H179038N16P(OM) + 1530. deep ocean (6.24) Please answer the following. Pay close attention to units! a) Temperature and salinity of the surface mixed layer are 5C and 35, respectively. Please report the dissolved O concentration in the surface ocean in units of mol kg. b) The DIP concentration in the surface mixed layer and deep ocean are 0.3 mol kg- and 1.8 mol kg-, respectively. At what rate is P exported out of the surface box in the form of particulate organic matter (i.e., what is the value of Jp)? Report your answer in units of mol-P yr. c) What is the concentration of dissolved O in the deep ocean? Please report your answer in mol kg- (1) You can construct a budget for O in the deep ocean, then link it to P through stoichiometry. (2) Find AOU using known values of O and DIP. Vmix

Answer rating: 100% (QA)

a To determine the dissolved O2 concentration in the surface ... View the full answer