== '''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]]

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

You have to change [[BR]]
    * in modipsl/config/ORCA2_LIM/IGCM00/COMP/opa9.card :

1. use ${year} for loop [[BR]]
2. create directory to put new forcing files ( or use common account : https://forge.ipsl.jussieu.fr/nemo/wiki/private/libIGCM/common_account )[[BR]]
3. Location of files

ListNonDel= (${R_BC}/OCE/${config_UserChoices_TagName}/radlw_DFS4-ORCA2_${year}.nc, qlw_core), \ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/radsw_DFS4-ORCA2_${year}.nc, qsw_core), \ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/q2_DFS4-ORCA2_${year}.nc, q2_core), \ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/t2_DFS4-ORCA2_${year}.nc, t2_core), \ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/u10_DFS4-ORCA2_${year}.nc, u10_core),\ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/v10_DFS4-ORCA2_${year}.nc, v10_core),\ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/precip_DFS4-ORCA2_${year}_12.nc, precip_core),\ [[BR]]
            (${R_BC}/OCE/${config_UserChoices_TagName}/snow_DFS4-ORCA2_${year}_12.nc, snow_core),\ [[BR]]

'''NOTE : ''' it is important to give to same output name that you can find in namelist ( like qw_lcore, etc... )

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

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

   ln_blk_core = .true. 

2. set correct frequency, name and interpolation in CORE bulk formulae ( namsbc_core )

               !   file name        ! frequency (hours) ! variable   ! time interpol. !  clim   ! 'yearly' or ! weights  ! rotation !
               !                    !  (if <0  months)  !   name     !    (logical)   !  (T/F)  !  'monthly'  ! filename ! pairing  !
   sn_wndi     =    'u10_core'      ,       6.          , 'u10'      ,    .true.      , .false. ,  'yearly'   , ''       ,  ''
   sn_wndj     =    'v10_core'      ,       6.          , 'v10'      ,    .true.      , .false. ,  'yearly'   , ''       ,  ''
   sn_qsr      =    'qsw_core'      ,       6.          , 'swdn'     ,    .true.      , .false. ,  'yearly'   , ''       ,  ''
   sn_qlw      =    'qlw_core'      ,       6.          , 'lwdn'     ,    .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'   ,       6.          , 'precip'   ,    .true.      , .false. ,  'monthly'  , ''       ,  ''
   sn_snow     =    'snow_core'     ,       6.          , '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]]