Auxiliary data files for EXTRAP/NINENN, EXTRAP/WEIGHT, INTERP/SURFMESH, INTERP/GAUSSIAN, MOZAIC, and SUBGRID

The auxiliary data files containing the weights and addresses used in these transformations have a similar structure; their names are given in Table 7.1.

The files nweights, mweights and gweights can be created by OASIS3 if their corresponding $NIO = 1 (see EXTRAP/NINENN, INTERP/SURFMESH, INTERP/GAUSSIAN in sections 6.3 and 6.4).

The name of the (sub)grid-mapping files for MOZAIC, EXTRAP/WEIGHT and SUBGRID analyses can be chosen by the user and have to be indicated in the namcouple (see respectively sections 6.3 and 6.4 and 6.5). These files have to be generated by the user before starting the coupled run.

The structure of these files is as follows:

      ...
      CHARACTER*8 cladress,clweight
      INTEGER iadress(jpnb,jpo)
      REAL weight(jpnb,jpo)
      OPEN(unit=90, file='at31topa', form='unformatted')
      WRITE(clweight,'(''WEIGHTS'',I1)') knumb
      WRITE(cladress,'(''ADRESSE'',I1)') knumb
      WRITE (90) cladress
      WRITE (90) iadress
      WRITE (90) clweight
      WRITE (90) weight

where

• jpnb is the maximum number of neighbors used in the transformation ($NVOISIN in the namcouple)
• jpo is the total dimension of the target grid
• at31topa is the name of the grid-mapping data file ($CFILE in namcouple)
• knumb is the identificator of the data set ($NID in namcouple)
• cladress is the locator of the address dataset
• clweight is the locator of the weight dataset
• iadress (i,j) is the address on the source grid of the neighbor used for the mapping of the target grid point. The address is the index of a grid point within the total number of grid points.
• weight(i,j) is the weight affected to the neighbor used for the transformation of the target grid point

For file nweights, there is an additional brick composed of a CHARACTER*8 variable (formed by the characters INCREME and by the data set identificator) and of an INTEGER array(N) which is the iteration number within EXTRAP/NINENN at which the extrapolation of the grid point is effectively performed.