| | 282 | '''HACK_VEGET_MAX_NEW''' can be used to prescribe veget_max from run.def rather than a PFT map. This is a useful feature to debug simplified test cases with land cover changes. One possible approach to set up a simple test case is to run ORCHIDEE for 1 year (but could be any length depending on your needs) with IMPOSE_VEG = y, VEGET_UPDATE = 0Y. Set the SECHIBA_VEGMAX according to your test case (for example SECHIBA_VEGMAX__06=0.5 SECHIBA_VEGMAX__10=0.5 all others set to 0). Next set-up the model to start from the restart of the previous set-up. This new set-up should not be longer than 1y (the model should run for longer than 1 y but the hack will be implemented every year). Set IMPOSE_VEG = n (this is needed to make veget_update work), VEGET_UPDATE = 1Y (this is needed to make HACK_VEGET_MAX_NEW work), HACK_VEGET_MAX_NEW = y and now set FRAC_NOBIO_NEW and VEGET_MAX_NEW to your needs. For example VEGET_MAX_NEW__06 = 1 and VEGET_MAX_NEW__10 = 0.0 (note that VEGET_MAX_NEW is defined at the PFT level). For more complex test also FRAC_NOBIO_NEW can be set (defined at the pixel level). In the example above the 0.5 fraction of grasslands (PFT10) will be converted into summergreen deciduous forest (PFT6). |
