Change Surface Boundary Conditions


How to change Surface Boundary forcing files

ORCA2_LIM description: http://www.nemo-ocean.eu/Using-NEMO/Configurations/ORCA2_LIM

for nemo version till 3_2_2 :

When you download
./model NEMO
by default you have a configuration with climatological forcing, bulk clio formulae, and you use common account of IPSL

from nemo version 3_3 :

When you download NEMOGCM
by default you have a configuration with climatological forcing, bulk core formulae, forcing files COREII, not common account of IPSL is used.

Change from climatolgical (bulk_clio) to interannual (bulk_core)

(with DRAKKAR forcing files)

If you want to change forcing method to have an Interannaul run with bulk_core formulae
you have to :

  • in ORCA2_LIM/IGCM00/COMP/opa9.card:
  1. if you don't use IPSL's common accout you have to comment line:
OPA_version=v3_2

NOTE : that v3_2 corresponding forcing files for tag version of NEMO.

  1. Choose interannual run

Interannual_Run='''y''' 

  1. List Surface Boundary Condition original files name ( got by the job )
List_jobsbc=(radlw_DFS4-ORCA2, radsw_DFS4-ORCA2, q2_DFS4-ORCA2, t2_DFS4-ORCA2, u10_DFS4-ORCA2, v10_DFS4-ORCA2, snow_DFS4-ORCA2, precip_DFS4-ORCA2)

NOTE : It is very important to control variable name in netcdf files. In namelist you have to put exactly the same variable name that you have in netcdf files.

  • in ORCA2_LIM/IGCM00/PARAM/namelist:
  1. Activation of bulk core formulae in Surface Boundary Condition function ( namsbc )
ln_blk_core = .true.  
(and ln_blk_clio = .false.)
  • in ORCA2_LIM/IGCM00/config.card:
  1. Change Calendar Type? and Perdio Length?
CalendarType=noleap
PeriodLength=1M
R_BC=/path/directory/with/DFS4_files_and_sbc

(note: DFS4_files_and_sbc directory has to have DFS4 forcing files, and boundary conditions files.
In my directory I changed precip and snow file's names, because I removed suffix _12, to have same names for all variables)

  1. Rebuild job

for nemo version v_3_3

  cd NEMOGCM/EXTERNAL
  ./util/ins_job

till nemo version v_3_2_2

  cd modipsl
  ./util/ins_job

Change from interannaul (bulk_core) to climatolgical (bulk_clio)

  1. Choose climatological run
  • in ORCA2_LIM/IGCM00/COMP/opa9.card you have to :

Interannual_Run='''n''' 
  1. List Surface Boundary Condition original files name ( got by the job )
List_jobsbc'''=(flx, taux_1m, tauy_1m)

NOTE : It is very important to control variable name in netcdf files. In namelist you have to put same variable name that you have in netcdf files.

  • in ORCA2_LIM/IGCM00/PARAM/namelist :
  1. Activation of bulk clio formulae in Surface Boundary Condition function ( namsbc )
ln_blk_clio = .true. 
(and ln_blk_core = .false.)
  • in ORCA2_LIM/IGCM00/config.card:
  1. Change Calendar Type? and Period Length?
CalendarType=noleap
PeriodLength=1Y
  1. Rebuild job

for nemo version v_3_3

  cd NEMOGCM/EXTERNAL
  ./util/ins_job

till nemo version v_3_2_2

  cd modipsl
  ./util/ins_job

Change from climatolgical (bulk_clio) to climatological (bulk_core)

(with CORE2 forcing files)

If you want to change forcing method to have a Climatological run with bulk_core formulae
you have to :

NOTE: if forcing files are not on ORCA2 grid you have to interpolate them. (see: http://www.nemo-ocean.eu/Using-NEMO/Pre-and-post-processing-packages/Pre-Processing/cdo-interpolation )

  1. List Surface Boundary Condition original files name ( get by the job )
List_jobsbc=(u_10.15JUNE2009_orca2, v_10.15JUNE2009_orca2, ncar_rad.15JUNE2009_orca2, t_10.15JUNE2009_orca2, q_10.15JUNE2009_orca2, ncar_precip.15JUNE2009_orca2)

NOTE : It is very important to control variable name in netcdf files. In namelist you have to put exactly the same variable name that you have in netcdf files.

  • in ORCA2_LIM/IGCM00/PARAM/namelist :
  1. Activation of bulk core formulae in Surface Boundary Condition function ( namsbc )
ln_blk_core = .true.  
(and ln_blk_clio = .false.)
  1. Example of namelist :
&namsbc_core namsbc_core CORE bulk formulea
file name frequency (hours) variable time interpol. clim 'yearly'/ weights rotation
(if <0 months) name (logical) (T/F) 'monthly' filename pairing
sn_wndi ='u_10.15JUNE2009_orca2' 6 'U_10_MOD' .false. .true. 'yearly'
sn_wndj ='v_10.15JUNE2009_orca2' 6 'V_10_MOD' .false. .true. 'yearly'
sn_qsr ='ncar_rad.15JUNE2009_orca2' 24 'SWDN_MOD' .false. .true. 'yearly'
sn_qlw ='ncar_rad.15JUNE2009_orca2' 24 'LWDN_MOD' .false. .true. 'yearly'
sn_tair ='t_10.15JUNE2009_orca2' 6 'T_10_MOD' .false. .true. 'yearly'
sn_humi ='q_10.15JUNE2009_orca2' 6 'Q_10_MOD' .false. .true. 'yearly'
sn_prec ='ncar_precip.15JUNE2009_orca2' -1 'RAIN' .false. .true. 'yearly'
sn_snow ='ncar_precip.15JUNE2009_orca2' -1 'SNOW' .false. .true. 'yearly'
sn_tdif ='taudif_core' 24 'taudif' .false. .true. 'yearly'
cn_dir ='./' root directory for the location of the bulk files
ln_2m = .false. air temperature and humidity referenced at 2m (T) instead 10m (F)
ln_taudif = .false. HF tau contribution: use "mean of stress module - module of the mean stress" data ?
rn_pfac = 1. multiplicative factor for precipitation (total & snow)
  • in ORCA2_LIM/IGCM00/config.card:
  1. Change Calendar Type? and Perdio Lenght?
CalendarType=noleap
PeriodLength=1M
R_BC=/path/directory/with/CORE2_climatological_interpolates_files_and_sbc

(note: CORE2_climatological_interpolates_files_and_sbc directory has to have CORE2 climatological, interpolated forcing files, and boundary conditions files.)

  1. Rebuild job

for nemo version v_3_3

  cd NEMOGCM/EXTERNAL
  ./util/ins_job

till nemo version v_3_2_2

  cd modipsl
  ./util/ins_job

Last modified 10 years ago Last modified on 2011-02-09T14:04:20+01:00