Bc:halo-Copy

Two-dimensional B-grid of the CICE sea-ice model (Hunke et al., Los Alamos Sea Ice Model), the horizontal mesh of the momentum/stress/transport components: `i` (x) and `j` (y) are the cell axes of N_I x N_J T cells (the grid cells that carry the ice state), `corner` is the 4-member axis of the cell-corner (staggered U-point) stress values (corner 1 = NE = the U point U(i,j) at the cell's north-east corner, 2 = NW, 3 = SW, 4 = SE), and `ncat` is the thickness-category axis of NCAT categories.