(*)Correct scaling of DT_OBC_SEG_UPDATE_OBGC

  Added a missing dimensional rescaling factor in the get_param call for the
recently added variable DT_OBC_SEG_UPDATE_OBGC in initialize_MOM, which would
have caused certain cases to fail the dimensional consistency tests.  All
answers are bitwise identical in cases that do not use dimensional rescaling,
but answers will change (and be corrected) in some cases that use dimensional
consistency tests.

src/core/MOM.F90

@@ -300,7 +300,10 @@ module MOM
                                      !! calculated, and if it is 0, dtbt is calculated every step.
   type(time_type) :: dtbt_reset_interval !< A time_time representation of dtbt_reset_period.
   type(time_type) :: dtbt_reset_time     !< The next time DTBT should be calculated.
-  real            :: dt_obc_seg_period   !< The time interval between OBC segment updates for OBGC tracers
+  real            :: dt_obc_seg_period   !< The time interval between OBC segment updates for OBGC
+                                         !! tracers [T ~> s], or a negative value if the segment
+                                         !! data are time-invarant, or zero to update the OBGC
+                                         !! segment data with every call to update_OBC_segment_data.
   type(time_type) :: dt_obc_seg_interval !< A time_time representation of dt_obc_seg_period.
   type(time_type) :: dt_obc_seg_time     !< The next time OBC segment update is applied to OBGC tracers.
 
@@ -2186,12 +2189,11 @@ subroutine initialize_MOM(Time, Time_init, param_file, dirs, CS, restart_CSp, &
                  units="s", default=default_val, do_not_read=(dtbt > 0.0))
   endif
 
-  CS%dt_obc_seg_period = -1.0
   call get_param(param_file, "MOM", "DT_OBC_SEG_UPDATE_OBGC", CS%dt_obc_seg_period, &
                "The time between OBC segment data updates for OBGC tracers. "//&
                "This must be an integer multiple of DT and DT_THERM. "//&
                "The default is set to DT.", &
-               units="s", default=US%T_to_s*CS%dt, do_not_log=.not.associated(CS%OBC))
+               units="s", default=US%T_to_s*CS%dt, scale=US%s_to_T, do_not_log=.not.associated(CS%OBC))
 
   ! This is here in case these values are used inappropriately.
   use_frazil = .false. ; bound_salinity = .false.