See [2244].
New parameters ropp_MDFV, ropp_MDTV, ropp_ZERO, ropp_ZDTV have been defined in main ROPP_UTILS module file ropp_utils/ropp_utils.f90. These are now used by all other modules and routines. The ropp_MDFV value is set to a very large 'missing' value, and can be easily adjusted by the user in the one location at compile time if required. The ropp_MDTV is still set at -9000 to be suitable for use with any files generated using ROPP-3 or prior software.
The _FillValue attribute is now set to ropp_MDFV in writing a new netCDF file with routine ropp_io/ropp/ropp_io_write_ncdf_def.f90.
Ticket closed as fixed.