In this section we present the simulations performed following the same protocol used in simulations for ORCHIDEE trunk rev 3109.

The protocol consists in tree parts:

• Spin-up : 340 years spin-up with CRU-NCEP forcing, cycling on 1901-1910. No restart.
• Transient : Land cover map is changing annually. Forcing is still cycling over 1901-1910. Restart from spin-up simulation simulation.
• Historical : Historical simulation using CRU-NCEP. Restart from transient simulation.

For further details see the FG1low.CWRR.3109, FG1translow.CWRR.3109, FG2low.CWRR.3109 simulations in ​https://forge.ipsl.jussieu.fr/orchidee/wiki/ReferenceSimulations/3109

BUGS During the first test, at the historical step, the simulation crashed. A big bug was found related to the allometric rule coding. The problem comes from the NewX function in stomate_growth_fun_all.f90. The function aim is to find the Cs_target which respects the allometric rules, knowing Cl_target, but this function does not work properly. In some cases it does not find any solution for Cs_target and the model crashes. This function is not always called, but only in the cases when the allometric rules are not respected. As a first approximation degree we decide not to call NewX function.

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The code is modified starting from the branch ORCHIDEE_CN revision 3238. The simulation follows the protocol described above and consists in 3 parts: reflowCN3238.SPINUP.NewX: Spin-up reflowCN3238.TRANS.NewX: Transient reflowCN3238.RUN.NewX: Historical