Changes between Initial Version and Version 1 of Users/ReferenceConfigurations/GYRE_PISCES

Timestamp:

2016-12-01T18:06:55+01:00 (7 years ago)

Author:

cbricaud

Comment:

--

Users/ReferenceConfigurations/GYRE_PISCES

@@ +1 @@
+== GYRE ==
+
+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.[[BR]]
+
+
+== 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):[[BR]]
+
+
+1 - Choose the grid size:[[BR]]
+
+In CONFIG/GYRE/EXP00, edit your namelist_cfg file to change the jp_cfg, jpi, jpj, jpk namelist variables in &namcfg:[[BR]]
+
+||JP_CFG        ||JPI   ||JPJ   ||JPK   ||Number of points      ||Equivalent to||
+||1             ||  30  ||  20  ||101   ||60600                 ||GYRE 1°      ||
+||25            || 750  || 500  ||101   ||37875000              ||ORCA 1/2°    ||
+||50            ||1500  ||1000  ||101   ||151500000             ||ORCA 1/4°    ||
+||150           ||4500  ||3000  ||101   ||1363500000            ||ORCA 1/12°   ||
+||200           ||6000  ||4000  ||101   ||2424000000            ||ORCA 1/16°   ||
+
+2 - 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[[BR]]
+
+ 
+{{{
+nn_bench    =    1     !  Bench mode (1/0): CAUTION use zero except for bench
+
+}}}
+
+3 - 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 equivallent, use rn_rdt=1200.)[[BR]]
+
+   
+{{{
+rn_rdt      = 1200.     !  time step for the dynamics
+}}}
+ 
+
+4- Optionnal, 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 add key_dynspg_ts, and recompile/ create your executable again (makenemo...).[[BR]]
+In your namelist_cfg file, in edit namelist_cfg and in the &namsplit namelist, add the following line:[[BR]]
+
+ 
+{{{
+ 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.[[BR]]
+
+The GYRE cpp keys, namelists and scripts can be explored in the GYRE configuration directory (NEMOGCM/CONFIGURATION/GYRE and NEMOGCM/CONFIGURATION/GYRE/EXP00) , in the NEMO browser (using the same login as the web site).[[BR]]
+
+Find here monthly mean outputs of 10 years run - trunk of 1 year -[[BR]]
+Download the files from the [http://prodn.idris.fr/thredds/catalog/ipsl_public/reee451/NEMO_OUT/GYRE/catalog.html DODS server of IDRIS ]