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Land Use Map

How to update LAND USE vegetation in ORCHIDEE. This change the vegetation veget_max along years. There are two sort of maps :

1. Big files with all historical maps inside as in

   BC/SRF/OL2/PFTmap_1850to2005_AR5_LUHa.rc2.nc
   

2. The same datas split in one file per year in the directory

   BC/SRF/OL2/PFTmap_1850to2005_AR5_LUHa.rc2/PFT_map_${year}.nc
   

Rules for Land Use :

• Except for the first initialization without restart, the vegetation map is always change at the end of the year (midnight, the last day of december). Then STOMATE can compute LAND COVER CHANGE fluxes for the next year with old and new veget_max. Then the new veget_max is saved in the restart for january.

• If you set parameter VEGET_UPDATE = 0Y, ORCHIDEE will read only one map in the Land Use file gives by the VEGET_YEAR parameter (the index of the map in the file and NOT the corresponding year).

• If you set VEGET_UPDATE = nY (n is an INTERGER gt one), the veget_max will be updated the first time and each n years exactly. There is a new variable veget_year in the sechiba restart to keep the last value.

• An index veget_year is saved in the restart. It is the index of the veget_max map in the PFT map file saved in the restart.

• During the run, if the index is greater than the number of map in the file, it will return to one automaticly.

• If you want to use a PFT map file in case two (only one year per file) or just change PFT map file, you must use SECHIBA parameter VEGET_REINIT (=y/n). It will change the index to 1. Then the first map will be read for the new PFT map file.