| Version 2 (modified by peylin, 5 years ago) (diff) |
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Spin Up of the Carbon variables
Principle
The carbon stocks and fluxes take a relatively long time to be in equilibrium when starting from zero.
- Above ground C stocks/fluxes: The spin up is much longer
- Below ground C stocks/fluxes
Standard protocol
A standard protocol is provided in the TRENDY model intercomparison project. The protocol comprises:
- a long simulation equivalent to several thousands of years should be done, recycling the meteorological forcing (usually recycling the first 10 years of forcing) and choosing the atmospheric CO2 concentration of "preindustrial conditions"; This brings the above and below ground C pools into equilibrium. It should be done either with:
- the analytical spin up activated: in this case a relatively shorter simulation should be done in order to brind the above ground C pools (tree biomass) into equilibrium => this provides and "equilibrium" for the input of C to the soil; the analytical spin up then allows to bring the soil carbon pools in one matrix inversion given that the soil carbon dynamic follows first order kinetic equations.
- or the force soil routine or the ==> This first step lead to an equilibrium of all reservoirs with the chosen climate and atmospheric CO2 concentration
- a transient simulation
