| 1 | ### =========================================================================== |
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| 2 | ### |
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| 3 | ### Periodicity of ORCA fields |
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| 4 | ### |
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| 5 | ### =========================================================================== |
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| 6 | ## |
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| 7 | ## Warning, to install, configure, run, use any of Olivier Marti's |
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| 8 | ## software or to read the associated documentation you'll need at least |
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| 9 | ## one (1) brain in a reasonably working order. Lack of this implement |
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| 10 | ## will void any warranties (either express or implied). |
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| 11 | ## O. Marti assumes no responsability for errors, omissions, |
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| 12 | ## data loss, or any other consequences caused directly or indirectly by |
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| 13 | ## the usage of his software by incorrectly or partially configured |
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| 14 | ## personal. |
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| 15 | ## |
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| 16 | ## SVN information |
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| 17 | __Author__ = "$Author$" |
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| 18 | __Date__ = "$Date$" |
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| 19 | __Revision__ = "$Revision$" |
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| 20 | __Id__ = "$Id$" |
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| 21 | __HeadURL = "$HeadURL$" |
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| 22 | |
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| 23 | def lbc (ptab, nperio=6, cd_type='T', psgn=1.0) : |
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| 24 | """ |
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| 25 | ptab : Input array |
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| 26 | rank 2 at least : patb[...., lat, lon] |
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| 27 | nperio : Type of periodicity |
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| 28 | 1, 4, 6 : Cyclic on i dimension (generaly longitudes) |
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| 29 | 2 : Obsolete (was symmetric condition at southern boundary ?) |
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| 30 | 3, 4 : North fold T-point pivot (legacy ORCA2) |
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| 31 | 5, 6 : North fold F-point pivot (ORCA1, ORCA025, ORCA2 with new grid for paleo) |
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| 32 | cd_type : Grid specification : T, U, V or F |
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| 33 | psgn : For change of sign for vector components |
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| 34 | |
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| 35 | See NEMO documentation for further details |
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| 36 | """ |
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| 37 | |
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| 38 | jpi = ptab.shape[-1] |
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| 39 | |
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| 40 | # |
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| 41 | #> East-West boundary conditions |
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| 42 | # -------------------------------- |
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| 43 | |
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| 44 | if nperio in [1, 4, 6] : |
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| 45 | # ... cyclic |
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| 46 | ptab [...,:, 0] = ptab [...,:,-2] |
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| 47 | ptab [...,:, -1] = ptab [...,:, 1] |
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| 48 | |
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| 49 | # |
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| 50 | #> North-South boundary conditions |
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| 51 | # ---------------------------------- |
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| 52 | if nperio in [3, 4] : # North fold T-point pivot |
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| 53 | if cd_type in [ 'T', 'W' ] : # T-, W-point |
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| 54 | ptab[..., -1, 1: ] = psgn * ptab[..., -3, -1:0:-1 ] |
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| 55 | ptab[..., -1, 0 ] = psgn * ptab[..., -3, 2 ] |
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| 56 | ptab[..., -2, jpi//2: ] = psgn * ptab[..., -2, jpi//2:0:-1 ] |
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| 57 | |
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| 58 | if cd_type == 'U' : |
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| 59 | ptab[..., -1, 0:-1 ] = psgn * ptab[..., -3, -1:0:-1 ] |
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| 60 | ptab[..., -1, 0 ] = psgn * ptab[..., -3, 1 ] |
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| 61 | ptab[..., -1, -1 ] = psgn * ptab[..., -3, -2 ] |
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| 62 | ptab[..., -2, jpi//2-1:] = psgn * ptab[..., -2, jpi//2+1:0:-1] |
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| 63 | |
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| 64 | if cd_type == 'V' : |
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| 65 | ptab[..., -2, 1: ] = psgn * ptab[..., -3, jpi-1:0:-1 ] |
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| 66 | ptab[..., -1, 1: ] = psgn * ptab[..., -4, -1:0:-1 ] |
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| 67 | ptab[..., -1, 0 ] = psgn * ptab[..., -4, 2 ] |
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| 68 | |
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| 69 | if cd_type == 'F' : |
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| 70 | ptab[..., -2, 0:-1 ] = psgn * ptab[..., -3, -1:0:-1 ] |
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| 71 | ptab[..., -1, 0:-1 ] = psgn * ptab[..., -4, -1:0:-1 ] |
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| 72 | ptab[..., -1, 0 ] = psgn * ptab[..., -4, 1 ] |
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| 73 | ptab[..., -1, -1 ] = psgn * ptab[..., -4, -2 ] |
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| 74 | |
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| 75 | if nperio in [5, 6] : # North fold F-point pivot |
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| 76 | if cd_type in ['T', 'W'] : |
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| 77 | ptab[..., -1, 0: ] = psgn * ptab[..., -2, -1::-1 ] |
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| 78 | |
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| 79 | if cd_type == 'U' : |
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| 80 | ptab[..., -1, 0:-1 ] = psgn * ptab[..., -2, -2::-1 ] |
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| 81 | ptab[..., -1, -1 ] = psgn * ptab[..., -2, 0 ] |
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| 82 | |
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| 83 | if cd_type == 'V' : |
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| 84 | ptab[..., -1, 0: ] = psgn * ptab[..., -3, -1::-1 ] |
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| 85 | ptab[..., -2, jpi/2: ] = psgn * ptab[..., -2, jpi/2-1::-1 ] |
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| 86 | |
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| 87 | if cd_type == 'F' : |
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| 88 | ptab[..., -1, 0:-1 ] = psgn * ptab[..., -3, -2::-1 ] |
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| 89 | ptab[..., -1, -1 ] = psgn * ptab[..., -3, 0 ] |
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| 90 | ptab[..., -2, jpi//2:-1] = psgn * ptab[..., -2, jpi//2-2::-1 ] |
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| 91 | |
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| 92 | return ptab |
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| 93 | |
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| 94 | ## =========================================================================== |
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| 95 | ## |
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| 96 | ## That's all folk's !!! |
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| 97 | ## |
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| 98 | ## =========================================================================== |
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