Set up a simulation with routage simple

Author: J. Ghattas
Last revision: 2022/03/17, J. Ghattas

Routage simple is developped by Yann Meurdesoif using the same physics as the standard routage but having another parallelization. It is currently available in branch ORCHIDEE_2_2.

Do as follow if running without libIGCM

• Use revision 7526 or more recent on branch ORCHIDEE_2_2. Compile as default.
• Use file ${R_IN}/SRF/ROUTING/routing_simple.nc instead of standard routing.nc file. The file should keep the name routing_simple.nc in the run directory. R_IN=/projsu/igcmg/IGCM at ciclad and exists as well at jean-zay, irene and obelix.
• In orchidee.def (or run.def) set:

  RIVER_ROUTING=y
  ROUTING_METHOD = simple
  

• Use all xml files in ORCHIDEE/src_xml including context_routing_orchidee.xml
• Add in iodef.xml after inclusion of the context_orchidee.xml:

  <context id="orchidee" src="./context_routing_orchidee.xml"/>
  

• There is a new restart file specific for the routage simple. It is created at first start of the model. It is called routing_restart.nc when written and to restart the simulation it should be called routing_start.nc.
• A new output file is written called diag_routing.nc. Some output are also avaialble in sechiba_history.nc.

Do as follow when using libIGCM

• With LMDZOR
  • Install LMDZOR_v6.2_work. Update to have above revision 7526 or later for the source code in modipsl/modeles/ORCHIDEE and the latest revision of the modipsl/config/LMDZOR_v6 folder.
  • Create a new experiment using LMDZOR/clim_pdControl
  • In your experiment folder, copy COMP/orchidee.card_routage_simple into COMP/orchidee.card
  • If you want another experiment, see the difference to add in orchidee.card by comparing EXPERIMENTS/LMDZOR/clim_pdControl/COMP/orchidee.card and EXPERIMENTS/LMDZOR/clim_pdControl/COMP/orchidee.card_routage_simple
• With ORCHIDEE offline (under edition)
  • Install ORCHIDEE_2_2. You will get the HEAD of modeles/ORCHIDEE and config/ORCHIDEE_OL. Compile as usual.
  • Copy the experiment you want to use and make following modifications:
    • Set in PARAM/run.def:

      RIVER_ROUTING=y
      ROUTING_METHOD = simple
      

    • Modify in COMP/sechiba.card (routing_simple.nc, context_routing_orchidee.xml, restart file, routage_diag.nc) more details to come.
    • Add xml file in COMP/orchidee_ol.card (or orchideedriver.card if using experiment with the new driver)