the

1
the natural carbon cyclespeciation of CO2 in
seawater

• Geol. 5700-004
• week 2

2
natural carbon stocks and flows
ocean DIC 38,000 DOC 600 living C 1
land living C 500 dead C 1500
60 GTC/y
90
90
atmosphere 700
metamorphism CaCO3 SiO2? CaSiO3 CO2 lt0.1
GTC/yr
weathering CaSiO3 CO2 ? CaCO3 SiO2 lt0.1 GTC/yr
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
3
the long-term C-cycle
organic
inorganic
CaSiO3 CO2 CaCO3 SiO2
CO2 H2O CH2O O2
Berner 03
4
what is ?c for different reservoirs?
ocean DIC 38,000 DOC 600 living C 1
land living C 500 dead C 1500
60 GTC/y
90
90
atmosphere 700
metamorphism CaCO3 SiO2? CaSiO3 CO2 lt0.1
GTC/yr
weathering CaSiO3 CO2 ? CaCO3 SiO2 lt0.1 GTC/yr
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
CO2 and temperature (Vostok, Ant.)
Petit et al. 1999
6
G-I perturbation budget (GtC)

• atm 170
• surface ocean 30
• biota 400 to 600
• deep ocean -600 to -800

Sundquist 93
7
glacial age physical perturbations
preindustrial
DICTA x 1.03
S x 1.03
?T -1 K
LGM
Zeebe Wolf-Gladrow 01