== '''Change Surface Boundary Conditions''' ==
[[BR]]

[[PageOutline]]
   
=== How to change Surface Boundary forcing files ===
 
ORCA2_LIM description: http://www.nemo-ocean.eu/Using-NEMO/Configurations/ORCA2_LIM 

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

=== 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 [[BR]]
you have to :

    * in modipsl/config/ORCA2_LIM/IGCM00/COMP/'''opa9.card''':

 0. 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 [[BR]]
 
 {{{
Interannual_Run='''y''' [[BR]]
 }}}
 
 2. List Surface Boundary Condition original files name ( get by the job ) [[BR]]

 {{{
 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)
 }}}

 '''NOTA BENE : ''' 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. [[BR]]

    * in modipsl/config/ORCA2_LIM/IGCM00/PARAM/'''namelist''':

 4. Activation of bulk core formulae in Surface Boundary Condition function ( namsbc )

 {{{
 ln_blk_core = .true.  [[BR]]
 (and ln_blk_clio = .false.)
 }}}

    * in modipsl/config/ORCA2_LIM/IGCM00/'''config.card''':

 5. Change CalendarType and PerdioLength 

 {{{
 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.''' [[BR]]
 In my directory I changed precip and snow file's names, because I removed suffix _12, to have same names for all variables)

 6. Rebuild job

{{{
  cd modipsl
  ./util/ins_job
}}}
 

=== Change from interannaul (bulk_core) to climatolgical (bulk_clio) ===

 1. Choose climatological run [[BR]]

    * in modipsl/config/ORCA2_LIM/IGCM00/COMP/opa9.card you have to :
 
 {{{
 Interannual_Run='''n''' 
 }}}

 2. List Surface Boundary Condition original files name ( get by the job ) [[BR]]

 {{{
 List_jobsbc'''=(flx, taux_1m, tauy_1m)
 }}}

 '''NOTA BENE : ''' 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.[[BR]]


    * in modipsl/config/ORCA2_LIM/IGCM00/PARAM/namelist :

 3. Activation of bulk clio formulae in Surface Boundary Condition function ( namsbc )

 {{{
 ln_blk_clio = .true. 
 (and ln_blk_core = .false.)
 }}}

    * in modipsl/config/ORCA2_LIM/IGCM00/'''config.card''':

 4. Change CalendarType and PeriodLength 

 {{{
 CalendarType=noleap
 PeriodLength=1Y
 }}}

 5. Rebuild job

{{{
  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 [[BR]]
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)
 }}}

 '''NOTA BENE : ''' 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. [[BR]]


    * in modipsl/config/ORCA2_LIM/IGCM00/PARAM/'''namelist''' :

 3. Activation of bulk core formulae in Surface Boundary Condition function ( namsbc )

 {{{
 ln_blk_core = .true.  [[BR]]
 (and ln_blk_clio = .false.)
 }}}

 4. 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 modipsl/config/ORCA2_LIM/IGCM00/'''config.card''':

 5. Change CalendarType and PerdioLenght 

 {{{
 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.''')

 6. Rebuild job

{{{
  cd modipsl
  ./util/ins_job
}}}