!!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
!! NEMO/TOP1 :  1 - tracer definition                     (namtrc    )
!! namelists    2 - dynamical tracer trends               (namtrc_trd)
!!              3 - tracer advection                      (namtrc_adv)
!!              4 - tracer lateral diffusion              (namtrc_ldf)
!!              5 - tracer vertical physics               (namtrc_zdf)
!!              6 - tracer newtonian damping              (namtrc_dmp)
!>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
!'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
&namtrc     !   tracers definition
!,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
   nn_dttrc      =  1        !  time step frequency for passive sn_tracers      
   nn_writetrc   =  0        !  time step frequency for sn_tracer outputs
   ln_top_euler  = .true.    !  use Euler timestepping for TOP
   ln_rsttr      = .false.   !  start from a restart file (T) or not (F)
   nn_rsttr      =   0       !  restart control = 0 initial time step is not compared to the restart file value
                           !                  = 1 do not use the value in the restart file
                           !                  = 2 calendar parameters read in the restart file
   cn_trcrst_in  = "restart_trc"   !  suffix of pass. sn_tracer restart name (input)
   cn_trcrst_out = "restart_trc"   !  suffix of pass. sn_tracer restart name (output)
   ln_trcdta     =  .false.        !  Initialisation from data input file (T) or not (F)
!
!              !    name   !           title of the field              !   units    ! initial data ! save   !
!              !           !                                           !            ! from file    ! or not ! 
!              !           !                                           !            ! or not       !        !
   sn_tracer(1)   = 'DUMMY   ' , 'Dummy tracer      '                 ,  'dummy-units' ,  .false.     ,  .true.
/
!-----------------------------------------------------------------------
&namtrc_adv    !   advection scheme for passive tracer 
!-----------------------------------------------------------------------
   ln_trcadv_cen2    =  .false.  !  2nd order centered scheme   
   ln_trcadv_tvd     =  .true.   !  TVD scheme
   ln_trcadv_muscl   =  .false.  !  MUSCL scheme
   ln_trcadv_muscl2  =  .false.  !  MUSCL2 scheme + cen2 at boundaries
   ln_trcadv_ubs     =  .false.  !  UBS scheme
   ln_trcadv_qck     =  .false.  !  QUICKEST scheme
   ln_trcadv_msc_ups =  .false.  !  use upstream scheme within muscl
/
!-----------------------------------------------------------------------
&namtrc_ldf    !   lateral diffusion scheme for passive tracer 
!-----------------------------------------------------------------------
   ln_trcldf_diff   =  .true.   !  performs lateral diffusion (T) or not (F)
!                               !  Type of the operator : 
   ln_trcldf_lap    =  .true.   !     laplacian operator       
   ln_trcldf_bilap  =  .false.  !     bilaplacian operator     
                                !  Direction of action  :
   ln_trcldf_level  =  .false.  !     iso-level                
   ln_trcldf_hor    =  .false.  !     horizontal (geopotential)         (require "key_ldfslp" when ln_sco=T)
   ln_trcldf_iso    =  .true.   !     iso-neutral                       (require "key_ldfslp")
!                               !  Coefficient
   rn_ahtrb_0       =     0.    !     background eddy diffusivity for ldf_iso [m2/s]
/
!-----------------------------------------------------------------------
&namtrc_zdf        !   vertical physics
!-----------------------------------------------------------------------
   ln_trczdf_exp   =  .false.  !  split explicit (T) or implicit (F) time stepping
   nn_trczdf_exp   =   3       !  number of sub-timestep for ln_trczdfexp=T
/
!-----------------------------------------------------------------------
&namtrc_rad        !  treatment of negative concentrations 
!-----------------------------------------------------------------------
/
!-----------------------------------------------------------------------
&namtrc_dmp    !   passive tracer newtonian damping
!-----------------------------------------------------------------------
/

!-----------------------------------------------------------------------
&namtrc_dta    ! initial conditions
!-----------------------------------------------------------------------
/

!-----------------------------------------------------------------------
&namtrc_bc     ! boundary conditions
!-----------------------------------------------------------------------
/

!-----------------------------------------------------------------------
&namtrc_trd       !   diagnostics on tracer trends        ('key_trdtrc')
!                          or mixed-layer trends          ('key_trdmld_trc')
!----------------------------------------------------------------------
/

!-----------------------------------------------------------------------
&namtrc_dia       !   parameters for passive tracer additional diagnostics
!----------------------------------------------------------------------
/