! Vertical mixing coefficients for biological tracers for nonlinear
! model and basic state scale factor in adjoint-based algorithms:
! [1:NBT,Ngrids].
AKT_BAK == 12*1.0d-6 ! m2/s
AKT_BAK at here is invalid because model doesn't calculate AKT for passive tracers and uses AKT of salinity to calculate vertical diffusion for passive tracers. It might mislead users.