| 1 | # NEMO periodicity |
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| 2 | |
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| 3 | NEMO periodicity is defined as follow :<br/> |
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| 4 | <dl> |
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| 5 | <dt>closed boundary (in_perio=0)</dt> |
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| 6 | <dd>ghost cells (solid walls) are imposed at all model boundaries.</dd> |
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| 7 | @image html perio0_20.png |
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| 8 | @image latex perio0_20.png |
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| 9 | <dt>cyclic east-west boundary (in_perio=1)</dt> |
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| 10 | <dd>first and last rows are closed, whilst the first column is set to the value of the last-but-one column and the last column to the value of the second one.</dd> |
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| 11 | @image html perio1_20.png |
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| 12 | @image latex perio1_20.png |
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| 13 | <dt>symmetric boundary condition across the equator. (in_perio=2)</dt> |
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| 14 | <dd>last row, and first and last columns are closed. </dd> |
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| 15 | @image html perio2_20.png |
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| 16 | @image latex perio2_20.png |
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| 17 | <dt>North fold boundary with a T -point pivot (in_perio=3)</dt> |
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| 18 | <dd>first row, and first and last columns are closed. </dd> |
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| 19 | @image html perio3_20.png |
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| 20 | @image latex perio3_20.png |
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| 21 | <dt>North fold boundary with a T -point pivot and cyclic east-west boundary (in_perio=4)</dt> |
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| 22 | <dd>first row is closed. The first column is set to the value of the last-but-one column and the last column to the value of the second one. </dd> |
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| 23 | @image html perio4_20.png |
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| 24 | @image latex perio4_20.png |
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| 25 | <dt>North fold boundary with a F -point pivot (in_perio=5)</dt> |
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| 26 | <dd>first row, and first and last columns are closed. </dd> |
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| 27 | @image html perio5_20.png |
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| 28 | @image latex perio5_20.png |
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| 29 | <dt>North fold boundary with a F -point pivot and cyclic east-west boundary (in_perio=6)</dt> |
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| 30 | <dd>first row is closed. The first column is set to the value of the last-but-one column and the last column to the value of the second one.</dd> |
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| 31 | @image html perio6_20.png |
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| 32 | @image latex perio6_20.png |
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| 33 | </dl> |
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| 34 | @sa For more information about NEMO periodicity, see _Model Boundary Condition_ chapter in [NEMO documentation](http://www.nemo-ocean.eu/About-NEMO/Reference-manuals)) |
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