/[MITgcm]/MITgcm/verification/global_with_exf/README
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revision 1.2 by heimbach, Tue Nov 12 20:57:00 2002 UTC revision 1.4 by dimitri, Fri Aug 15 01:42:44 2003 UTC
# Line 1  Line 1 
1  heimbach@mit.edu 07-Nov-2002.   heimbach@mit.edu 07-Nov-2002.
2  This verification experiment is almost identical to the  This verification experiment is almost identical to the
3  global_ocean.90x40x15 experiment, except that it uses  global_ocean.90x40x15 experiment, except that it uses
4  the exf (and cal) package instead of the  the exf (and cal) package instead of the
# Line 13  the following 2 modifications are necess Line 13  the following 2 modifications are necess
13  2. in exf_set_climsst.F:  2. in exf_set_climsst.F:
14     comment the 'quality' check, i.e. avoid the setting     comment the 'quality' check, i.e. avoid the setting
15     to freezing temperature if less than climtempfreeze.     to freezing temperature if less than climtempfreeze.
16    
17    ================================
18    
19    menemenlis@jpl.nasa.gov 05-Aug-2003
20    
21    Input-field spatial interpolation has been added to pkg/exf.
22    It is enabled by defining CPP option USE_EXF_INTERPOLATION
23    in EXF_CPPOPTIONS.h or in ECCO_CPPOPTIONS.h
24    Both bi-linear and bi-cubic interpolation schemes are supported.
25    
26    This package is a placeholder until a more general coupler
27    is made available by the ESMF project.  The output grid can be
28    arbitrary (cubed-sphere should be OK), but it is assumed that
29    the input grid is Cartesian with arbitrary latitude increments
30    in the y-direction and with equidistant longitude increments in
31    the x-direction.  The input grid must encompass the complete
32    output grid in the y-direction (i.e., extrapolation is not
33    supported).  It is also assumed that the grid is periodic in
34    the x-direction; to use the interpolation routine with a
35    non-periodic domain, make sure there is sufficient padding
36    at the edges, i.e., two points for bicubic and one for bilinear
37    interpolation.
38    
39    The verification/global_with_exf experiment has been modified
40    to use the USE_EXF_INTERPOLATION option, the input grids
41    being defined by variables *_lon0, *_lon_inc, *_lat0, *_lat_inc
42    *_nlon and *_nlat in input/dat.exf and input/data.exf_clim
43    
44       *_lon0, *_lat0    :: lon and lat of sw corner of global input grid
45       *_lon_inc         :: scalar x-grid increment
46       *_lat_inc         :: vector y-grid increments
47       *_nlon and *_nlat :: input x-grid and y-grid size
48    
49    In this particular example the input and output grids are
50    the same, so the results of the verification experiment remain
51    unchanged from before.
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