[Wrf-users] Adaptive Time-step output times mismatch/incorrect

[David Ovens]

Rahul, 

I am not sure if this bug is the same that I found earlier in 3.2,
since I noticed an output bug with a time_step of 216 seconds and
adaptive time stepping was turned off.  But, take a look at your
external/esmf_time_f90/ESMF_Clock.F90 around line 1024.  It should
look like this:

              IF ( ( .NOT. ( pred1 ) ) .AND. &
                   ( ( pred2 ) .OR. ( pred3 ) ) ) THEN
                 alarm%alarmint%Ringing = .TRUE.
!                 alarm%alarmint%PrevRingTime = clock%clockint%CurrTime
                 alarm%alarmint%RingTimeSet = .FALSE.  !it is a one time alarm, it rang, now let it resort to interval
#if 1
! logic above is sufficient to set the PrevRingTime, it is now.
                 IF ( positive_timestep ) THEN

I hope that does it for you.

David
-- 
David Ovens		 e-mail: ovens at atmos.washington.edu
Research Meteorologist    phone: (206) 685-8108
Dept of Atm. Sciences      plan: Real-time MM5 forecasting for the
Box 351640                        Pacific Northwest
University of Washington          http://www.atmos.washington.edu/mm5rt
Seattle, WA  98195               Weather Graphics and Loops
                                  http://www.atmos.washington.edu/~ovens/loops


On Fri, Jun 25, 2010 at 10:53:29AM -0700, Rahul Mahajan wrote:
> Hi,
> I am using the adaptive time-stepping options in WRFV3.2.
> 
> I have set the following options in namelist.input that control the dump to
> the wrfout_d0X files
> 
> step_to_output_time = .true.
> adjust_output_times = .true.
> 
> According to the documentation, if the above options are used, the output
> times in the wrfout_d0X files for the nests should match the
> history_interval times. However, they dont. Is there a fix that makes sure
> that the output times in the nest be at the requested times? The parent
> domain always outputs at the specified history interval.
> 
> Here is an example: Say I want to output ever 10 mins, then the output times
> in the parent and the nest are:
> ncdump -v Times wrfout_d01
> Times =
>   "2008-08-10_00:00:00",
>   "2008-08-10_00:10:00",
>   "2008-08-10_00:20:00",
>   "2008-08-10_00:30:00",
>   "2008-08-10_00:40:00",
>   "2008-08-10_00:50:00",
>   "2008-08-10_01:00:00",
>   "2008-08-10_01:10:00",
>   "2008-08-10_01:20:00",
>   "2008-08-10_01:30:00",
>   "2008-08-10_01:40:00",
>   "2008-08-10_01:50:00",
>   "2008-08-10_02:00:00",
>   "2008-08-10_02:10:00",
>   "2008-08-10_02:20:00",
>   "2008-08-10_02:30:00",
>   "2008-08-10_02:40:00",
>   "2008-08-10_02:50:00",
>   "2008-08-10_03:00:00",
>   "2008-08-10_03:10:00",
>   "2008-08-10_03:20:00",
>   "2008-08-10_03:30:00",
>   "2008-08-10_03:40:00",
>   "2008-08-10_03:50:00",
>   "2008-08-10_04:00:00",
>   "2008-08-10_04:10:00",
>   "2008-08-10_04:20:00",
>   "2008-08-10_04:30:00",
>   "2008-08-10_04:40:00",
>   "2008-08-10_04:50:00",
>   "2008-08-10_05:00:00",
>   "2008-08-10_05:10:00",
>   "2008-08-10_05:20:00",
>   "2008-08-10_05:30:00",
>   "2008-08-10_05:40:00",
>   "2008-08-10_05:50:00",
>   "2008-08-10_06:00:00" ;
> }
> 
> ncdump -v Times wrfout_d02
> Times =
>   "2008-08-10_00:00:00",
>   "2008-08-10_00:10:00",
>   "2008-08-10_00:20:16",
>   "2008-08-10_00:30:16",
>   "2008-08-10_00:40:38",
>   "2008-08-10_00:50:45",
>   "2008-08-10_01:01:07",
>   "2008-08-10_01:11:31",
>   "2008-08-10_01:21:35",
>   "2008-08-10_01:31:37",
>   "2008-08-10_01:41:54",
>   "2008-08-10_01:52:14",
>   "2008-08-10_02:02:15",
>   "2008-08-10_02:12:29",
>   "2008-08-10_02:22:37",
>   "2008-08-10_02:33:02",
>   "2008-08-10_02:43:23",
>   "2008-08-10_02:53:23",
>   "2008-08-10_03:03:23",
>   "2008-08-10_03:13:32",
>   "2008-08-10_03:23:32",
>   "2008-08-10_03:33:32",
>   "2008-08-10_03:43:32",
>   "2008-08-10_03:53:32",
>   "2008-08-10_04:03:32",
>   "2008-08-10_04:13:44",
>   "2008-08-10_04:23:58",
>   "2008-08-10_04:34:22",
>   "2008-08-10_04:44:24",
>   "2008-08-10_04:54:39",
>   "2008-08-10_05:04:55",
>   "2008-08-10_05:15:05",
>   "2008-08-10_05:25:18",
>   "2008-08-10_05:35:25",
>   "2008-08-10_05:45:35",
>   "2008-08-10_05:55:50" ;
> }
> 
>   As you can see, the output times in the nest quickly gets out of sync and
> is no longer at the requested interval or at the requested times.
> Furthermore, the end time in the nest is not even outputted to file. (This
> can be a critical issue if the history_interval is large and the nest does
> not reach the end time exactly)
> 
> If the frames_per_outfile is set to 1 for all domains, the final time file
> for domain 2 is not even created.
> 
> Any help in this matter will be greatly appreciated.

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