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Users/ReferenceConfigurations/GYRE_PISCES – NEMO


Last edition: Wikinfo(changed_ts)? by Wikinfo(changed_by)?

Idealized configuration representing double gyres in the North hemisphere, Beta-plane with a regular grid spacing at 1° horizontal resolution (and possible use as a benchmark by easily inscreasing grid size), 101 vertical levels, forced with analytical heat, freshwater and wind-stress fields.
This configuration is coupled to PISCES biogeochemichal model.

Running GYRE as a benchmark

This simple configuration can be used as a benchmark since it is easy to increase resolution (and in this case no physical meaning of outputs):

  1. Choose the grid size

In CONFIG/GYRE/EXP00, edit your namelist_cfg file to change the jp_cfg, jpi, jpj, jpk variables in &namcfg:

jp_cfg jpi jpj jpk Number of points Equivalent to
1 30 20 101 60600GYRE 1°
25 750 500 101 37875000ORCA 1/2°
50 1500 1000 101 151500000ORCA 1/4°
150 4500 3000 101 1363500000ORCA 1/12°
200 6000 4000 101 2424000000ORCA 1/16°
  1. In namelist_cfg again, avoid problems in the physics (and results will not be meaningful in terms of physics) by setting nn_bench = 1 in &namctl
       nn_bench    =    1     !  Bench mode (1/0): CAUTION use zero except for bench
  1. If you increase domain size, you may need to decrease time-step (for stability) by changing rn_rdt value in &namdom (i.e. for jp_cfg = 150, ORCA12 equivalent, use rn_rdt = 1200)
       rn_rdt      = 1200.     !  time step for the dynamics
  1. Optional, in order to increase the number of MPI communication for benchmark purposes: you can change the number of sub-timesteps computed in the time-splitting scheme each iteration. First change the list of active CPP keys for your experiment, in CONFIG/"your configuration name"/cpp_"your configuration name".fcm : replace key_dynspg_flt by key_dynspg_ts and recompile/create your executable again
       makenemo [...] add_key 'key_dynspg_ts' del_key 'key_dynspg_flt'

In your namelist_cfg file, edit the &namsplit namelist by adding the following line:

   nn_baro       =    30               !  Number of iterations of barotropic mode/

nn_baro = 30 is a kind of minimum (we usually use 30 to 60).So than increasing the nn_baro value will increase the number of MPI communications.

The GYRE CPP keys, namelists and scripts can be explored in the GYRE configuration directory (NEMOGCM/CONFIG/GYRE and NEMOGCM/CONFIG/GYRE/EXP00).

Find here monthly mean outputs of 1 year run

Last modified 5 years ago Last modified on 2017-05-17T11:55:05+02:00