lbc_lnk in TOP_SRC

In LOBSTER, lbc_lnk is called for the prognostic variables in the uppermost layer only:

LOBSTER/trcbio.F90:            CALL lbc_lnk( zw2d(:,:,jl),'T', 1. )
LOBSTER/trcbio.F90:            CALL lbc_lnk( zw3d(:,:,:,jl),'T', 1. )
LOBSTER/trcbio.F90:            CALL lbc_lnk( trbio(:,:,1,jl),'T', 1. )
LOBSTER/trcexp.F90:      CALL lbc_lnk( sedpocn, 'T', 1. )
LOBSTER/trcini_lobster.F90:      CALL lbc_lnk( cmask, 'T', 1. )

While in PISCES, it is called for the entire water column:

PISCES/p4zsed.F90:         CALL lbc_lnk( zcmask , 'T', 1. )      ! lateral boundary conditions on cmask   (sign unchanged)
PISCES/p4zsed.F90.v1:         CALL lbc_lnk( zcmask , 'T', 1. )      ! lateral boundary conditions on cmask   (sign unchanged)
PISCES/p4zsed.F90.v2:         CALL lbc_lnk( zcmask , 'T', 1. )      ! lateral boundary conditions on cmask   (sign unchanged)
PISCES/trcsms_pisces.F90:        CALL lbc_lnk( trn(:,:,:,jn), 'T', 1. )
PISCES/trcsms_pisces.F90:        CALL lbc_lnk( trb(:,:,:,jn), 'T', 1. )
PISCES/trcsms_pisces.F90:        CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. )
PISCES/trcsms_pisces.F90:           CALL lbc_lnk( trn(:,:,:,jn), 'T', 1. )

While CFC and C14b do not use "lbc_lnk" subroutine.