NEMO ORCA2 : Standard configuration of NEMO IPSL CMIP5 coupled model

This page describes how to run 2 standard configurations of the NEMO Model on Titane

• ORCA2_LIM : a coupled ocean / sea-ice configuration based on the ORCA tripolar grid at 2° horizontal resolution with climatological forcing
• ORCA2_LIM_PISCES : ORCA2_LIM above configuration with PISCES biogeochemical model

For information

• The version of NEMO is the one corresponding to the v3_2 and located here : ​http://forge.ipsl.jussieu.fr/nemo/browser/branches/CMIP5_IPSL
• The outputs will not exactly be the same than the ones of the coupled model for AR5

Extraction

mkdir NEMO_STD  ;  cd NEMO_STD

svn_ano
cd modipsl/util
./model NEMO

Installation and Compilation

Suggestion : Compile and run on 32 processors ( equivalent on elapsed time to 4 processors on NEC_SX8 )

vi modeles/NEMO/OPA_SRC/par_oce.F90
   jpni = 4
   jpnj = 8

cd modipsl/modeles/UTIL
./fait_config ORCA2_LIM   [ or ORCA2_LIM_PISCES ]
cd ../../config/ORCA2_LIM [ or ORCA2_LIM_PISCES ]
../../util/ins_make
gmake clean ; gmake

Create a Job

cd IGCM00  ;  vi config.card

#============================
#-- PBS Class (required on brodie mono/multi)
##JobClass=mono
JobClass=multi
#============================
#-- Total Number of Processors
JobNumProcTot=5
#JobNumProcTot=1
#============================
#-- Run Options : 
JobRunOptions=''
#JobRunOptions='"-np "${BATCH_NUM_PROC_TOT}"'
#============================

cd ORCA2_LIM [ or ORCA2_LIM_PISCES ] ../../../util/ins_job

}}}

Run the model

In this example, we run at all 5 years of ORCA2_LIM [ ORCA2_LIM_PISCES ] splitted in runs of 1 year ( not of 1 month as for IPSLCM5A )

#============================
#-- leap, noleap, 360d
CalendarType=noleap
#-- Begin and end of Job
#-- "YYYY-MM-DD"
DateBegin=2001-01-01
DateEnd=2005-12-31
#============================
#-- 1Y, 1M, 5D, 1D
PeriodLength=1Y
#============================

The output frequency of the files are also different from the ones of IPSLCM5A. So the files PARAM/iodef.xml are not the same

#========================================================================
#D-- OCE -
[OCE]
WriteFrequency="1Y 1M 5D 1D"


#========================================================================
#D-- ICE -
[ICE]
WriteFrequency="5D"


#========================================================================
#D-- MBG -
[MBG]
WriteFrequency="1Y 1M 5D"