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

[[PageOutline]]
   
=== How to change Surface Boundary forcing files ===
 
By default from nemo web site :  

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

you have forcing files for bulk CLIO formulae

If you want to use other atmospheric forcing methods you can chose :

analytical [[BR]]
flux  [[BR]]
bulk ( CLIO formulae ) [[BR]]
bulk ( CORE formulae ) [[BR]]
coupled  [[BR]]
[[BR]]


    * in modipsl/config/ORCA2_LIM/IGCM00/COMP/opa9.card you have to :

1. decomment '''OPA_version''' if you want to use COMMON ACCOUNT [[BR]]
 ( https://forge.ipsl.jussieu.fr/nemo/wiki/private/libIGCM/common_account ) [[BR]]

2. choose if you want to do an [[BR]]
 interannul run ( '''Interannual_Run=y''' ) [[BR]]
 climatological run ( '''Interannual_Run=n''' ) [[BR]]

3. Choose forcing method ( like in the following examples ) 


=== Example : using CORE bulk formulae ===

    * In modipsl/config/ORCA2_LIM/IGCM00/COMP/opa9.card you have to :

 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)[[BR]]

 '''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]]

 List Surface Boundary Condition files name expected by NEMO ( same as the ones in namelist ) [[BR]]

 '''List_runsbc'''=(qlw_core, qsw_core, q2_core, t2_core, u10_core, v10_core, snow_core, precip_core)

 '''NOTA BENE''' : you can leave List_runsbc=(), and this means that List_runsbc=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) 

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

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

   ln_blk_core = .true. 

 Set correct frequency, name and interpolation in CORE bulk formulae ( namsbc_core )

  ||      ||   file name  ||  frequency (hours) (if <0  months) || variable name || time interpol. (logical) || clim (T/F) || 'yearly' or monthly || weights filename || rotation  pairing||
  || sn_wndi  || 'u10_core' ||  6. || 'u10' ||.true. ||.false. || 'yearly' || ' '  || ' '||
  || sn_wndj  || 'v10_core' ||  6. || 'v10' || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_qsr   || 'qsw_core' ||  6. || 'radsw'|| .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_qlw   || 'qlw_core' ||  6. || 'radlw'|| .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_tair  || 't2_core'  ||  6. ||' t2'  || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_humi  || 'q2_core'  ||  6. || 'q2'  || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_prec  || 'precip_core'|| -1.|| 'precip'|| .true.|| .false.|| 'monthly'|| ' ' ||' '||
  || sn_snow  || 'snow_core'|| -1.|| 'snow'|| .true.|| .false.|| 'monthly'|| ' '  ||' '||
! [[BR]]
   cn_dir      = './'      !  root directory for the location of the bulk files  [[BR]]
   ln_2m       = .true.    !  air temperature and humidity referenced at 2m (T) instead 10m (F)  [[BR]]
   alpha_precip= 1.        !  multiplicative factor for precipitation (total & snow)  [[BR]]

=== Example : using CLIO bulk formulae ===

    * in modipsl/config/ORCA2_LIM/IGCM00/COMP/opa9.card you have to :

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

 '''List_jobsbc'''=(flx, taux_1m, tauy_1m)[[BR]]

 '''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]]

 List Surface Boundary Condition files name expected by NEMO ( same as the ones in namelist ) [[BR]]

 '''List_runsbc'''=(flx, taux_1m, tauy_1m)

'''NOTA BENE''' : you can leave List_runsbc=(), and this means that List_runsbc=List_jobsbc=(flx, taux_1m, tauy_1m)

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

1. activation of bulk clio formulae in Surface Boundary Condition function ( namsbc )

   ln_blk_clio = .true. 

2. set correct frequency, name and interpolation in CLIO bulk formulae ( namsbc_clio )

||      ||   file name  ||  frequency (hours) (if <0  months) || variable name || time interpol. (logical) || clim (T/F) || 'yearly' or monthly || weights filename || rotation  pairing||
  || sn_utau  || 'taux_1m' ||  -1 || 'sozotaux' ||.false. ||.true. || 'yearly' || ' '  || ' '||
  || sn_wndj  || 'v10_core' ||  6. || 'v10' || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_qsr   || 'qsw_core' ||  6. || 'radsw'|| .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_qlw   || 'qlw_core' ||  6. || 'radlw'|| .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_tair  || 't2_core'  ||  6. ||' t2'  || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_humi  || 'q2_core'  ||  6. || 'q2'  || .true.|| .false.|| 'yearly' || ' '  || ' '||
  || sn_prec  || 'precip_core'|| -1.|| 'precip'|| .true.|| .false.|| 'monthly'|| ' ' ||' '||
  || sn_snow  || 'snow_core'|| -1.|| 'snow'|| .true.|| .false.|| 'monthly'|| ' '  ||' '||

   sn_vtau     = 'tauy_1m'    ,       -1.         , 'sometauy' ,    .false.     , .true.  , 'yearly'  , ''       , ''
   sn_wndm     = 'flx'        ,       -1.         , 'socliowi' ,    .false.     , .true.  , 'yearly'  , ''       , ''
   sn_tair     = 'flx'        ,       -1.         , 'socliot2' ,    .false.     , .true.  , 'yearly'  , ''       , ''
   sn_humi     = 'flx'        ,       -1.         , 'socliohu' ,    .false.     , .true.  , 'yearly'  , ''       , ''
   sn_ccov     = 'flx'        ,       -1.         , 'socliocl' ,    .false.     , .true.  , 'yearly'  , ''       , ''
   sn_prec     = 'flx'        ,       -1.         , 'socliopl' ,    .false.     , .true.  , 'yearly'  , ''       , ''
!
   cn_dir      = './'      !  root directory for the location of the bulk files are