The NEMO configurations
Table of contents
Person in charge: Christian Ethé
1. Description
The NEMO configuration described here is an ocean-sea ice configuration based on the version 3.6 stable of NEMO (Nucleus for European Models of the Ocean), which includes three major components: the ocean physics NEMO-OPA, the sea-ice dynamics and thermodynamics NEMO-LIM3 and the ocean biogeochemistry NEMO-PISCES. The available resolutions builded on the ORCA quasi-isotropic global tripolar grid are 2°, 1° and 1/4°. The 1° (eORCA1) and 1/4° (eORCA025) are extended to the south so as to better represent the contribution of Antarctic under-ice shelf seas to the Southern ocean freshwater cycle. Notice that the biogeochemical model PISCES can be run coupled online with the dynamics ( ORCA1-LIM3-PISCES for example ) or in a "stand-alone" ( ORCA2-LIM3-PISCES). This NEMO configuration has been builded to be able to perfom the OMIP6 experiments ( omip1 and omip2 protocol) ; thus some specific sources code are available through the shaconemo repository.
To find out more about the model description and the reference configurations, go here: http://www.nemo-ocean.eu/About-NEMO. To use and extract NEMO, you first need to register and choose a login/passwd
2. Technical details
2.1. The configuration on mod.def
#-H- NEMO_v6.1 NEMOGCM for CMIP6 exercise #-H- NEMO_v6.1 libIGCM trunk rev 1534 #-H- NEMO_v6.1 XIOS branch xios-2.5 rev 1903 #-M- NEMO_v6.1 platform-extract@listes.ipsl.fr #-C- NEMO_v6.1 trunk/libIGCM 1548 10 libIGCM . #-C- NEMO_v6.1 branches/2015/nemo_v3_6_STABLE/NEMOGCM 9455 7 . modeles #-C- NEMO_v6.1 trunk/ORCA1_LIM3_PISCES 275 17 . modeles/NEMOGCM/CONFIG #-C- NEMO_v6.1 trunk/eORCA025_LIM3 275 17 . modeles/NEMOGCM/CONFIG #-C- NEMO_v6.1 trunk/eORCA025_LIM3_PISCES 275 17 . modeles/NEMOGCM/CONFIG #-C- NEMO_v6.1 trunk/ORCA1_OFF_PISCES 275 17 . modeles/NEMOGCM/CONFIG #-C- NEMO_v6.1 CONFIG/UNIFORM/v6/NEMO_v6 6072 8 NEMO_v6 config #-C- NEMO_v6.1 XIOS/branchs/xios-2.5 1903 12 XIOS modeles
2.2. Setting up pre-builded NEMO configurations
2.2.1. Installation and Compiling
mkdir $WORKDIR/NEMO_STD ; cd $WORKDIR/NEMO_STD svn co http://forge.ipsl.fr/igcmg/svn/modipsl/trunk modipsl cd modipsl/util ./model NEMO_v6.1
Several built-in configurations are provided to evaluate the skills and performances of the model ( cd ../config/NEMO_v6 ). They can be used as first easy set-up and as template for setting up a new configuration :
- ORCA2_LIM3_PISCES : the fully coupled global ocean on 2° horizontal grid and 31 vertical levels, with 10 levels in the top 100m
gmake ORCA2LIM3PISCES
- ORCA2_OFF_PISCES : stand-alone PISCES biogeochemical model on ORCA2 - dynamical fields are pre-calculated and read with specific time frequency
gmake ORCA2OFFPISCES
- ORCA1_LIM3_PISCES : the fully coupled global ocean on 1° horizontal grid, extended to the south and 75 vertical levels ( from 1~m at the surface to 10~m at 100~m depth, and reaches 200~m at the bottom)
gmake ORCA1LIM3PISCES
- ORCA1_LIM3_PISCES_CMIP6 : the ORCA1_LIM3_PISCES but to run the OMIP6 experiments
gmake ORCA1LIM3PISCES
- ORCA1_OFF_PISCES : stand-alone PISCES biogeochemical model on ORCA1
gmake ORCA1OFFPISCES
- ORCA025_LIM3 : the global ocean on 1/4° horizontal grid, without the PISCES model
gmake ORCA025LIM3
- ORCA025_LIM3_PISCES : the fully coupled global ocean on 1/4° horizontal grid
gmake ORCA025LIM3PISCES
2.2.2. Creating the job
For example : To perform an interannual COREII atmospheric forcing using the built eORCA1_LIM3_PISCES
cd modipsl/config/NEMO_v6 cp EXPERIMENTS/ORCA1_LIM3_PISCES/ia/config.card . ../../libIGCM/ins_job
2.3. Running the model
2.3.1. Input files: atmospheric forcings, initial states, namelists
The card files ( opa9.card for orca1_lim and pisces.card for pisces) contain the list of files needed to perform the simulation.
These files are described here.
2.3.2. The run
This example is a 62 years CORE2 forcing interannual run of ORCA1_LIM3_PISCES split in 1-year jobs.
JobName=eOR1L3P-IA-CORE #----- Short Name of Experiment ExperimentName=ORCA1ia #----- DEVT TEST PROD SpaceName=DEVT LongName="ORCA1_LIM3_PISCES NEMO configuration" TagName=ORCA1_LIM3_PISCES #D- Choice of experiment in EXPERIEMENTS directory ExpType=ORCA1_LIM3_PISCES/ia #============================ #-- leap, noleap, 360d CalendarType=noleap #-- Begin and end of Job #-- "YYYY-MM-DD" DateBegin=1948-01-01 DateEnd=2009-12-31 #============================ #-- 1Y, 1M, 5D, 1D PeriodLength=1Y
2.3.3. Submit the job
on jean-zay : sbatch Job_eOR1L3P-IA-CORE on irene : ccc_msub Job_eOR1L3P-IA-CORE
2.4. Performances
The performances of the NEMO configuration can be find here: http://forge.ipsl.fr/igcmg/wiki/PerformancesIPSLCM6
