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CICE grid generation from MOM supergrid #6

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CICE grid generation from MOM supergrid #6

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39277fe
Added Gen_CICE_grid.py to generate CICE grid from mom supergrid
ezhilsabareesh8 Feb 26, 2024
b7d84fa
Use np.deg2rad instead of constants
ezhilsabareesh8 Feb 26, 2024
0213e6e
x index shifted to NE corner from cell centre
ezhilsabareesh8 Feb 26, 2024
b902158
Updated ULAT and ULON indices
ezhilsabareesh8 Feb 27, 2024
47a0014
Update attributes to match grid.nc
ezhilsabareesh8 Feb 27, 2024
092d995
update attributes to match grid.nc
ezhilsabareesh8 Feb 27, 2024
8cd8480
Updated script filenames
ezhilsabareesh8 Feb 28, 2024
09be9fb
Added TAREA and UAREA variables
ezhilsabareesh8 Mar 1, 2024
f7434b2
Added versioning information
ezhilsabareesh8 Mar 3, 2024
90f1e35
Amended versioning information
ezhilsabareesh8 Mar 3, 2024
d3b4360
UAREA wrapping changed similar to esmgrids
ezhilsabareesh8 Mar 7, 2024
aa89836
dx and dy are defined on the edges in mom, and include the bottom/lef…
anton-seaice Mar 7, 2024
4b85704
turn on compression
anton-seaice Mar 7, 2024
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24 changes: 9 additions & 15 deletions grid_generation/Gen_CICE_grid.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,32 +60,27 @@ def generate_cice_grid(in_superGridPath, output_file):
TLAT = np.deg2rad(in_superGridFile['y'][1::2, 1::2])
TLON = np.deg2rad(in_superGridFile['x'][1::2, 1::2])

# MPI
HTN = in_superGridFile['dx'] * 100.0 # convert to cm
HTN = HTN[1::2, ::2] + HTN[1::2, 1::2]

@anton-seaice anton-seaice Mar 7, 2024

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Screenshot 2024-03-07 at 4 15 14 pm

In the mom_grid, dx has units ('nyp','nx'). These correspond to the edges in y and the middle in x. So, the y coordinate (i.e. rows) should be 2::2

HTE = in_superGridFile['dy'] * 100.0 # convert to cm
HTE = HTE[::2, 1::2] + HTE[1::2, 1::2]

# The angle of rotation is a corner cell centres and applies to both t and u cells.
ANGLE = np.deg2rad(in_superGridFile['angle_dx'][2::2, 2::2])
ANGLET= np.deg2rad(in_superGridFile['angle_dx'][1::2, 1::2])

# Area
AREA = (in_superGridFile['area'])
TAREA = AREA[::2,::2] + AREA[1::2,1::2] + AREA[::2,1::2] + AREA[1::2,::2]

array_to_roll = AREA[2::2,2::2]

# Roll the array along axis 0 and concatenate the last row as the first row
rolled_array_axis0 = np.concatenate((
np.roll(array_to_roll, -1, axis=0),
array_to_roll[-1:, :]), axis=0)

# Roll the rolled array along axis 1 and concatenate the last column as the first column
rolled_array = np.concatenate((
np.roll(rolled_array_axis0, -1, axis=1),
rolled_array_axis0[:, -1:]), axis=1)

UAREA = AREA[1::2,1::2] + np.concatenate((np.roll(AREA[1::2, 2::2], -1, axis=1), AREA[1::2, 2::2][:, :1]), axis=1) + np.concatenate((np.roll(AREA[2::2, 1::2], -1, axis=0), AREA[2::2, 1::2][:1, :]), axis=0) + rolled_array
# UAREA need to wrap around the globe. Copy ocn_area and
# add an extra column at the end. Also u-cells cross the
# tri-polar fold so add an extra row at the top.
area_ext = np.append(AREA[:], AREA[:, 0:1], axis=1)
area_ext = np.append(area_ext[:], area_ext[-1:, :], axis=0)

@anton-seaice anton-seaice Mar 7, 2024

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I think this line only works because the top row is symmetrical? It doesn't actual seem to fold it... ?


UAREA = area_ext[1::2, 1::2] + area_ext[2::2, 1::2] + \
area_ext[2::2, 2::2] + area_ext[1::2, 2::2]

# Close input files
in_superGridFile.close()
Expand Down Expand Up @@ -156,7 +151,6 @@ def generate_cice_grid(in_superGridPath, output_file):
angleT[:] = ANGLET
tarea[:] = TAREA
uarea[:] = UAREA

# Close the file
nc.close()

Expand Down