Help Needed with Observation Nudging in WRF Using Lidar Data

E

Erenw

New member
Hi everyone,

I'm trying to boost the accuracy of my WRF simulation by using observation nudging with some lidar data I've got. Since the OBSGRID.exe tool isn't suitable for this type of data, I took a shot at creating the OBS_DOMAIN101 file myself using Python as per the observation nudging guide.

I've attached the Python script and the output file OBS_DOMAIN101 here. I've run the obs_nudge with what I think is the right namelist setup, but it seems like the obs data isn't making a difference—the results are the same as without nudging, I think no obs data is read.

Is there anyone who can take a look and tell me if I'm doing something wrong? Any help would be really appreciated!

Thanks a lot!
''
&time
auxinput11_interval_s = 1, 1, 1,
auxinput11_end_h = 48, 48, 24,
auxinput11_end_h = 48,

&fdda
obs_nudge_opt = 1, 1, 1,
max_obs = 15000,
fdda_start = 0., 0., 0.,
fdda_end = 99999., 99999., 99999.,
obs_nudge_wind = 1, 1, 1,
obs_coef_wind = 6.0E-4, 6.0E-4, 6.0E-4,
obs_nudge_temp = 1, 1, 1,
obs_coef_temp = 6.0E-4, 6.0E-4, 6.0E-4,
obs_nudge_mois = 1, 1, 1,
obs_coef_mois = 6.0E-4, 6.0E-4, 6.0E-4,
obs_rinxy = 240., 240., 240.,
obs_rinsig = 0.1,
obs_twindo = 0.6666667,0.6666667,0.6666667,
obs_npfi = 10,
obs_ionf = 180, 180, 2,2,
obs_idynin = 0,
obs_dtramp = 40.,
obs_prt_freq = 10, 10, 10,10,
obs_prt_max = 10
obs_ipf_errob = .true.
obs_ipf_nudob = .true.
obs_ipf_in4dob = .true.
obs_ipf_init = .true.
/
''
 

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Last edited:
Hi,
Can you also share your namelist.oa file, namelist.input file, as well as your met_em* files? I'd like to try to run a test using your file and your specific set-up. The met_em* files are likely going to be too large to attach, so see the home page of this forum for instructions on sharing large files. Thanks!
 
Thanks, I made it work. i correct some format errors like SPACEs strictly adhering the guide. Now i am trying to integrate more observation stations and looking forward to assessing the potential improvements.
 
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