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'''Author''' : Christophe Calone ; Jennifer Simeon ; Christian Ethé ; Gurvan Madec

'''ticket''' : #1009     '''On-line coarsening of meshmask and ocean output '''

'''Branch''' : [https://forge.ipsl.jussieu.fr/nemo/browser/branches/2013/dev_r3411_CNRS4_IOCRS 2013/dev_r3411_CNRS4_IOCRS]

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== On-line CoaRSening (CRS) of mesh mask and ocean output ==
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== Notes ==

• Starting of Jennifer's work.

• We work exclusively on a factor of degradation of 3.

• For the scales factors coarsening e1 and e2 we have took the scale factor no coarsening who is in the middle of the coarsening cell that we multiply by 3.

• For the scale factor coarsening e3 we have took the maximum of the e3 no coarsening in the coarsening cell.

• In lbcnfd and lbcnlk some points was put at 0 and the north fold missed some points (earth points) so we have corrected this

• There is maybe a problem with the band of covering of the scale factor in cause of the band of 0 put in the South by lbclnk. A scale factor never be < 0

• To define the coarsening mask, we use dom_msk_crs define in CRS module. The coarsening fmask is not necessarily just, but it is not using in biology model.

• For corsen every fields we use crsfun_TW or crsfun_UV. The function used depend where the field is define ( grid U,V,W,T )

• We have calculate the kinetic energy, some surprise on the arctic region.

• coarsening of BGC and sea-ice outputs  ===>   to be done

• Modifications for the mpp : 

  - We can't use the function "mpp_init" for define the variables nleit_crs, nldit_crs ... So we calculate its in crsini

  - We have define mjs_crs mje_crs mie_crs mis_crs for every processor

  - Modifications of the borders of buckles CRS

  - Definition of new variables in the switch of grid 
 
  - Define some global variables in local variables in lib_mpp
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