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'''Author''' : AUTHOR_NAME 

'''ticket''' : #665

'''Branch''' : [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2015/dev_r5656_Met_Office_3_diurnalSST dev_r5656_Met_Office_3_diurnalSST ] 
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=== Description ===

Add the Takaya et al(2010) warm layer model and Artale et al(2002) cool skin model to NEMO.

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=== Testing ===
Testing could consider (where appropriate) other configurations in addition to NVTK].

||NVTK Tested||!'''YES!'''||
||Other model configurations||!'''YES!'''||
||Processor configurations tested||[ Standard configurations as tested by SETTE ]||
||If adding new functionality please confirm that the [[BR]]New code doesn't change results when it is switched off [[BR]]and !''works!'' when switched on||!'''YES'''||

(Answering UNSURE is likely to generate further questions from reviewers.)

'Please add further summary details here'

=== Bit Comparability ===
||Does this change preserve answers in your tested standard configurations (to the last bit) ?||!'''YES'''||
||Does this change bit compare across various processor configurations. (1xM, Nx1 and MxN are recommended)||!'''YES'''||
||Is this change expected to preserve answers in all possible model configurations?||!'''YES'''||
||Is this change expected to preserve all diagnostics? [[BR]]!,,!''Preserving answers in model runs does not necessarily imply preserved diagnostics. !''||!'''YES'''||

If you answered !'''NO!''' to any of the above, please provide further details:

 * Which routine(s) are causing the difference?
 * Why the changes are not protected by a logical switch or new section-version
 * What is needed to achieve regression with the previous model release (e.g. a regression branch, hand-edits etc). If this is not possible, explain why not.
 * What do you expect to see occur in the test harness jobs?
 * Which diagnostics have you altered and why have they changed?Please add details here........

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=== System Changes ===
||Does your change alter namelists?||!'''YES !'''||
||Does your change require a change in compiler options?||!'''NO !'''||

If any of these apply, please document the changes required here.......

A new namelist called namdiu has been added that controls the diurnal models.  I have added this namelist to namelist_ref in the shared directory.  By default, and to preserve the standard behaviour, the namelist has the cool skin and warm layer models switched off (i.e logical ln_diurnal=.FALSE.).
 
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=== Resources ===
!''Please !''summarize!'' any changes in runtime or memory use caused by this change......!''

There should be no changes if running with ln_diurnal=.FALSE. If ln_diurnal=.TRUE. then memory is required for two extra 2-D fields.  The warm layer and cool skin models (if ln_diurnal=.TRUE.) will also add additional computation, but the models are cheap and this should not be significant.

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=== IPR issues ===
||Has the code been wholly (100%) produced by NEMO developers staff working exclusively on NEMO?||!'''YES !'''||

If No:

 * Identify the collaboration agreement details
 * Ensure the code routine header is in accordance with the agreement, (Copyright/Redistribution etc).Add further details here if required..........