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the “ natural ” carbon cycle speciation of CO 2 in seawater

the “ natural ” carbon cycle speciation of CO 2 in seawater. Geol. 5700-008 week 2. the long-term C-cycle. organic. inorganic. CaSiO 3 + CO 2 CaCO 3 + SiO 2. CO 2 + H 2 O CH 2 O + O 2. Berner ‘ 03. natural carbon stocks and flows. ocean DIC: 38,000 DOC: 600

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the “ natural ” carbon cycle speciation of CO 2 in seawater

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  1. the “natural” carbon cyclespeciation of CO2 in seawater Geol. 5700-008 week 2

  2. the long-term C-cycle organic inorganic CaSiO3 + CO2 CaCO3 + SiO2 CO2 + H2O CH2O + O2 Berner ‘03

  3. natural carbon stocks and flows ocean DIC: 38,000 DOC: 600 living C: 1 land living C: 500 dead C: 1500 70 60 GTC/y atmosphere 700 metamorphism CaCO3 + SiO2CaSiO3 + CO2<0.1 weathering CaSiO3 + CO2 CaCO3 + SiO2 <0.1 sedimentary rocks CaCO3 + OC: 50,000,000 fossil fuels: 5000 stocks in GTC (gigatons C = 1015 g C) transfer fluxes in GTC/year Archer ‘07

  4. What is tc-labile w.r.t met + wx? ocean DIC: 38,000 DOC: 600 living C: 1 land living C: 500 dead C: 1500 70 60 GTC/y atmosphere 700 metamorphism CaCO3 + SiO2CaSiO3 + CO2<0.1 weathering CaSiO3 + CO2 CaCO3 + SiO2 <0.1 sedimentary rocks CaCO3 + OC: 50,000,000 fossil fuels: 5000 stocks in GTC (gigatons C = 1015 g C) transfer fluxes in GTC/year Archer ‘07

  5. CO2and temperature (Vostok, Ant.) Petit et al. 1999

  6. atm +170 surface ocean+30 biota +400 to +600 deep ocean -600 to -800 H-G perturbation budget (GTC) ~ Sundquist ‘93

  7. quantification G-H increase in atm. C burden by mass: mass atm. in moles = 1.73E20M CO2 mole fraction increase = 80 ppm = 80 mM_c/M_atm product = 1.38E22 uM_c= 1.38E16M_c = 13.8 petaM_c *12g/M_c = 166 PgC (=GTC) Equilibrium increase in surface ocean DIC from homogenous ocean buffer factor (B) = 10: ∂pCO2_pert_atm/pCO2_init_atm= B * ∂DIC_pert_oce/DIC_init_oce 280 ppm CO2_pert_atm/ 200 ppm CO2_init_atm = 1.40 = +40% 0.4/10 * 900GTC_oce_init = +36 GTC (see following TM presentation for full explanation of “B”) Change in land biota (from simple whole ocean d13C mass balance constraint): H-G Dd13C_oce = -0.3 per mil present whole ocean d13C_abs = 0 per mil (by definition) land biosphere  d13C_avg = -20 per mil (mean photosynthetic discrimination) 38000 GTC_init (0 per mil) = X_pert GTC (-20 per mil) + (38,000 - X_pert GTC) (-0.3 per mil) X_pert = +570 GTC (per mil = ppt deviation from measurement standard)

  8. glacial age physical perturbations preindustrial DIC+TA x 1.03 S x 1.03 T= -1 K LGM Zeebe & Wolf-Gladrow ‘01

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