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. 

*

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