!--------------------------------------------------------------------------
   !---------------------------- caldyn_vert ----------------------------------
   !$OMP DO SCHEDULE(STATIC)
   DO ij=1,primal_num
      DO l = llm-1,1,-1
         ! cumulate mass flux convergence from top to bottom
         convm(l,ij) = convm(l,ij) + convm(l+1,ij)
      END DO
      l=1
      dmass_col(ij) = convm(l,ij)
      DO l = 2,llm
         ! Compute vertical mass flux (l=1,llm+1 set to zero at init)
         wflux(l,ij) = mass_bl(l,ij) * dmass_col(ij) - convm(l,ij)
      END DO
   END DO
   !$OMP END DO
   ! make sure wflux is up to date
   !$OMP BARRIER
   !$OMP DO SCHEDULE(STATIC)
   DO edge = 1, edge_num
      ij_left = left(edge)
      ij_right = right(edge)
      DO l = 2, llm
         wwuu(l,edge) = .5*(wflux(l,ij_left)+wflux(l,ij_right))*(u(l,edge)-u(l-1,edge))
      END DO
   END DO
   !$OMP END DO
   ! make sure wwuu is up to date
   !$OMP BARRIER
   !$OMP DO SCHEDULE(STATIC)
   DO ij = 1, primal_num
      DO l = 1, llm
         convm(l,ij) = mass_dbk(l,ij) * dmass_col(ij) ! FIXME : we shoud prognose mass_col
      END DO
   END DO
   !$OMP END DO
   !$OMP DO SCHEDULE(STATIC)
   DO edge = 1, edge_num
      ij_left = left(edge)
      ij_right = right(edge)
      DO l = 1, llm
         du(l,edge) = du(l,edge) - (wwuu(l,edge)+wwuu(l+1,edge)) / (rhodz(l,ij_left)+rhodz(l,ij_right))
      END DO
   END DO
   !$OMP END DO
   DO iq=1,nqdyn
      !$OMP DO SCHEDULE(STATIC)
      DO ij = 1, primal_num
         DO l = 2, llm
            dtheta_rhodz(l,ij,iq) = dtheta_rhodz(l,ij,iq) + 0.5*(theta(l,ij,iq)+theta(l-1,ij,iq))*wflux(l,ij)
         END DO
      END DO
      !$OMP END DO
      !$OMP DO SCHEDULE(STATIC)
      DO ij = 1, primal_num
         DO l = 1, llm-1
            dtheta_rhodz(l,ij,iq) = dtheta_rhodz(l,ij,iq) - 0.5*(theta(l,ij,iq)+theta(l+1,ij,iq))*wflux(l+1,ij)
         END DO
      END DO
      !$OMP END DO
   END DO
   !---------------------------- caldyn_vert ----------------------------------
   !--------------------------------------------------------------------------