!-----------------------------------------------------------------------
&nam_traadv    !   advection scheme for tracer 
!-----------------------------------------------------------------------
   ln_traadv_cen2   =  .true.   !  2nd order centered scheme   
   ln_traadv_tvd    =  .false.  !  TVD scheme                
   ln_traadv_muscl  =  .false.  !  MUSCL scheme             
   ln_traadv_muscl2 =  .false.  !  MUSCL2 scheme + cen2 at boundaries  
   ln_traadv_ubs    =  .false.  !  UBS scheme                 
/