Baseline some initial logic to remove 'checksum' from

an existing file.

Fixes ufs-community#781.

sorc/global_cycle.fd/read_write_data.f90

@@ -177,6 +177,9 @@ subroutine write_data(lensfc,idim,jdim,lsoil, &
    dum2d = reshape(slifcs, (/idim,jdim/))
    error = nf90_put_var( ncid, id_var, dum2d)
    call netcdf_err(error, 'writing slmsk record' )
+
+   call remove_checksum(ncid, id_var)
+
  endif
 
  if(present(tsffcs)) then
@@ -573,6 +576,31 @@ subroutine write_data(lensfc,idim,jdim,lsoil, &
 
  end subroutine write_data
 
+ subroutine remove_checksum(ncid, id_var)
+
+ implicit none
+
+ integer, intent(in)       :: ncid, id_var
+
+ integer                   :: error
+
+ error=nf90_inquire_attribute(ncid, id_var, 'checksum')
+
+ if (error == 0) then ! attribute was found
+
+   error = nf90_redef(ncid)
+   call netcdf_err(error, 'entering define mode' )
+
+   error=nf90_del_att(ncid, id_var, 'checksum')
+   call netcdf_err(error, 'deleting checksum' )
+
+   error= nf90_enddef(ncid)
+   call netcdf_err(error, 'ending define mode' )
+
+ endif
+
+ end subroutine remove_checksum
+
  !> Read latitude and longitude for the cubed-sphere tile from the
  !! 'grid' file.  Read the filtered and unfiltered orography from
  !! the 'orography' file.