Multiple WRF-4DVar outputs

[jamcguir]

I have successfully ran WRF-4DVar, but I had a question regarding the output. Aside from the domain, the only changes I made to the namelist as listed below. The output I'm getting (single file, "wrfvar_output") is a single timestep (according to ncdump), and each of the 25 created "af" files are valid for the same analysis date.

In other words, 4D-Var seems to make only a single file for a single timestep, the "wrfvar_output" file at analysis_date. I had thought that there would be multiple timesteps between time_window_min and time_window_max, instead of just this one.

Is there a way to get multiple times written out? Or would I have to use the "wrfvar_output" back into WRF and do this for every hour (Like 3D-Var)? Thanks!

&wrfvar3
num_fgat_time=25,
/
&wrfvar18
analysis_date="2009-02-20_12:00:00.0000",
/
&wrfvar21
time_window_min="2009-02-20_12:00:00.0000",
/
&wrfvar22
time_window_max="2009-02-21_12:00:00.0000",
/
&wrfvar23
/
&time_control
run_hours=24,
start_year=2009,
start_month=02,
start_day=20,
start_hour=12,
end_year=2009,
end_month=02,
end_day=21
end_hour=12,

[you2]

Hi jamcguir ,

I believe wrfvar_output should be a single time file because it is only for initial condition. One can never get a multiple time wrfvar_output file. Using update_bc to update the boundaries, and then we are all set.

Here, may I ask you a question? Since you have successfully run 4dvar (I assume version 3.2), have you check the increment in the low level u wind of 2008020512Z tutorial case? My test on that case generates a very large low level u wind (>-80m/s), and I do not know if this is the result we suppose to have in that tutorial case.

Thanks,

you2

[aroma37]

Hi, jamcguir & you2

I envied your success of 4dvar.
My question don't fit your topic, but I believe in your answer.

I try WRF 4dvar for running. but I failure.
but I succeed nl and tl process of 4dvar.

ad process don't make output.
This is error message, when I execute wrfplus.exe in ad folder.

WRF V2.0.3.1 MODEL
DYNAMICS OPTION: Eulerian Mass Coordinate
INPUT LANDUSE = USGS
LANDUSE TYPE = USGS FOUND 33 CATEGORIES 2 SEASONS
WATER CATEGORY = 16 SNOW CATEGORY = 24
STEPRA,STEPCU,STEPBL 10 1 1
med_auxinput_in : opening auxinput3_d01_2008-02-05_12:00:00 for reading. 0
-------------- FATAL CALLED ---------------
FATAL CALLED FROM FILE: input_wrf.b LINE: 78
wrf_get_dom_ti_integer getting dimension information from dataset
-------------------------------------------
wrf_abort

I check dimension information in namelist.input, and wrfinput_d01(ncdump -h wrfinput_d01)
repeat numerous times.
What's the matter my process ? Please help me, jamcguir & you2