[Wrf-users] Error ( WOULD GO OFF TOP) using observation nudging

[Josh Hacker]

Eduardo,

What is the resolution of your grid 3?  You have an instability that has
caused a failure in the Kain-Fritch Cu parameterization.  You might
consider whether you want to use that parameterization for d03 if it is
very find resolution.

Also make sure that your observations are high quality and that you have
checked all the known bugs.

Josh


Eduardo Penabad Ramos wrote:
> Hello!
> 
> I'm starting to test observation nudging capabilities of WRF-ARW (WRF3.0 
> version). I am trying running a 3 nested grids setup, and trying to 
> nudge observations into the finer grid (d03).
> 
> When observation nudging is turned on, it starts to produce this kind of 
> errors...
> 
> Timing for main: time 2009-05-28_13:44:14 on domain   3:    0.60050 
> elapsed seconds.
>   WOULD GO OFF TOP: KF_ETA_PARA I,J,DPTHMX,DPMIN          53          27 NaN
>            5000.000
> 
> Below there is a copy of &fdda namelist:
> 
> &fdda
> obs_nudge_opt = 0,0,1,
> max_obs = 150000,
> fdda_start = 0., 0., 0.,
> fdda_end = 99999., 99999., 99999.,
> obs_nudge_wind = 0,0,0,0,0
> obs_coef_wind = 6.E-4,6.E-4,6.E-4,
> obs_nudge_temp = 1,1,1,
> obs_coef_temp = 6.E-4,6.E-4,6.E-4,
> obs_nudge_mois = 1,1,1,
> obs_coef_mois = 6.E-4,6.E-4,6.E-4,
> obs_rinxy = 50.,50.,50.,
> obs_rinsig = 0.1,
> obs_twindo = 0.666667, 0.666667, 0.666667, ! (in hours)
> obs_npfi = 10,
> obs_ionf = 2, 2, 2,
> obs_idynin = 0,
> obs_dtramp = 10.,
> obs_nobs_prt = 10, 10, 10,
> obs_ipf_errob = .true.
> obs_ipf_nudob = .true.
> obs_ipf_in4dob = .true.
> obs_ipf_init = .true.
>  /
> 
> Any suggestions on this issue? Thanks in advance!
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-- 
Joshua Hacker
Research Applications Laboratory
NCAR/UCAR
email: hacker at ucar.edu
voice: 303-497-8188
fax: 303-497-8386