Within a horizontal surface at depth level k, grid points and cells are arranged such that a grid point (where subscript i is the longitude index, j is the latitude index, and k is the depth index) is located at the northeast vertex of cell . Conversely, the grid point is located at the southwest vertex of cell . The southwestern most column of T-cells has indices ``i=1'' and ``jrow=1''. Similarly, the northeasternmost column of T-cell within the grid has indices ``i=imt'' and ``jrow=jmt''. This horizontally staggered grid system is replicated and distributed vertically between the ocean surface and bottom of the domain. T i,k=1,j is the first cell below the surface and T i,k=km,j is the deepest cell. Unlike in the horizontal, T cells and U cells are not staggered vertically so all T cells and U cells with index k are at the same depth.