1 HE . VM V . . 3. BONUS QUESTION. Consider a 3-box model of a hypothetical ocean-atmosphere Atmosphere system. Given th

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1 He Vm V 3 Bonus Question Consider A 3 Box Model Of A Hypothetical Ocean Atmosphere Atmosphere System Given Th 1 (127.01 KiB) Viewed 80 times

1 HE . VM V . . 3. BONUS QUESTION. Consider a 3-box model of a hypothetical ocean-atmosphere Atmosphere system. Given the following conditions, please answer the questions below. Surface mixed layer The system is in steady state River input and sediment burial are negligible (and ignored here for simplicity). This also means that biogenic particles are 100% regenerated in the deep ocean. DIP is the limiting nutrient Deep ocean Molar C:N:P ratio in organic matter (soft tissue) is 106:16:1 Ji = flux of element or constituent i to the deep ocean driven by the biological pump Vm = rate of vertical mixing = 1.26 x 1018 kg/yr For every 106 moles of CO2 fixed to make organic matter, At increases by 16 moles (and vice versa during respiration) Effects of DIP uptake/regeneration on At are small enough to be ignored The deep ocean is sufficiently large such that its DIP, DIC and At concentrations remain constant at: [DIP]deep = 2.2 umol kg! [DIC]deep = 2256 umol kg [AT]deep = 2332 umol kg- KH = [CO2]/Pco2 = 3.24 x 102 mol kg atm Ki* = [HCO3-][H][CO2] = 1.41 x 10-6 K2* = [CO3+][H+][HCO3 ] = 1.07 x 109 • Atmospheric Pco2 is controlled by the composition of surface seawater through the approximate relation: K* (2 x DIC - Ay) Pco2 = Κ ΚΗ AT - DIC . . a. What is the Pcoz of the atmosphere that is in equilibrium with a dead version of this ocean (i.e., J= 0)? For simplicity, ignore any temperature effects (i.e., ignore the solubility pump). Hint: Surface and deep oceans have the same solute concentrations in this dead ocean. Report your answer in units of uatm (same as ppm). [4 bonus pts] b. We now inject life into the ocean by introducing diatoms into the surface mixed layer. We turn on the biological pump, and let the system run until it reaches a new steady-state. If the surface DIP concentration under this new condition is 0.2 umol kg !, what is Jp in mol/yr? [3 bonus pts]