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#!html
The NEMO configurations
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[[PageOutline(1-3,Table of contents,,numbered)]]
Person in charge: Christian Ethé
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# 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 ##
### Installation and Compiling ###
{{{
mkdir $WORKDIR/NEMO_STD ; cd $WORKDIR/NEMO_STD
svn co http://forge.ipsl.jussieu.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
### 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 ##
### 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.[[BR]]
These files are described here: https://forge.ipsl.jussieu.fr/igcmg_doc/wiki/Doc/Models/NEMO
### 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
}}}
### Submit the job ###
{{{
#!sh
on jean-zay : sbatch Job_eOR1L3P-IA-CORE
on irene : ccc_msub Job_eOR1L3P-IA-CORE
}}}
## Performances ##
The performances of the NEMO configuration can be find here: http://forge.ipsl.jussieu.fr/igcmg/wiki/PerformancesIPSLCM6