Carbon Cycle Modeling. Global Carbon Cycle. Carbon Budget: missing sink. Biosphere-atmosphere exchange: photosynthesis and respiration. 6 CO2 + 12 H2O + light → C6H12O6 + 6 O2 + 6 H2O Carbon Dioxide + Water + Light energy → Glucose + Oxygen + Water C6H12O6 + 6O2 → 6CO2 + 6H2O.
Carbon Cycle Modeling
computed using the mean monthly distribution of sea-air pCO difference,
the climatological NCEP 41-year mean wind speed. The yellow-red colors indicate a region characterized by a net release of CO to the atmosphere, and the blue-purple colors indicate a region with a net uptake of CO from the atmosphere. This map yields an annual oceanic uptake flux for CO of 2.2 ± 0.4 Pg C yr .
Annual national wood harvest aggregated to continental values, for 1700 – 2000.
Total global integrated wood harvest 1700-2000 is 86 Pg C.
CO2 = 280 ppmv (560 PgC) + FF
2000 Pg C
37400 Pg C + FF
…equilibrium takes 103-104 yrs
Lands use changes
Why do we need a model of
and biogeochemical cycles?
Hypotheses for the terrestrial sink:
1. CO2 Fertilization
2. Climate Change
3. Land Use
Solving the carbon problem is
twice as hard if the missing sink is caused by land use instead of CO2 fertilization.
Courtesy C. Vorosmarty, UNH