Commits on Apr 9, 2021

1. +Enhanced support for novel axes in MOM_io …

     Added support for new IO capabilities that are needed by SIS2 to use the MOM6
   framework and infrastructure code, but should also be useful within MOM6
   itself.  These new capabilities include writing global attributes to files,
   using create_file named axes that are not derived from a MOM6 grid type, and new
   options and elements in the vardesc type to support a wider array of axes and to
   provide the position of the grid staggering via an integer position variable
   instead of the short character strings that had been used.
   
     As a part of this commit, there are the new opaques type axis_info and
   attribute_info, and the new routines set_axis_info, delete_axis_info,
   set_attribute_info and delete_attribute_info to facilitate these new
   capabilities, as well as the publicly visible function position_from_horgrid to
   translate the vardesc%hor_grid character strings into the integer position flag
   used elsewhere in the MOM6 and FMS codes.  Within the MOM_io_infra, there is a
   new variant of the overloaded interface write_meta to handle writing global
   attributes. There are also two new optional arguments to create_file and
   reopen_file, and two new optional arguments to var_desc, modify_vardesc, and
   query_vardesc.  All answers and output are bitwise identical.

   

   Hallberg-NOAA committed Apr 9, 2021
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