[Wrf-users] Re: Wrf-users Digest, Vol 32, Issue 20

[anil rohilla]

Dear Elif SERTEL,
     You can use WRF2Grads software for converting your output to grads
format.It will produce grads output in same interval as in your output file.


regards

On 4/27/07, wrf-users-request at ucar.edu <wrf-users-request at ucar.edu> wrote:
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> Today's Topics:
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>    1. FW: Using Diffusion TKE equation at 1 km (Kemp, Eric M.)
>    2. Minimum TKE with Mellor-Yamada-Janjic PBL (Kemp, Eric M.)
>    3. about model output (Elif SERTEL)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 26 Apr 2007 14:17:07 -0400
> From: "Kemp, Eric M." <Eric.Kemp at ngc.com>
> Subject: [Wrf-users] FW: Using Diffusion TKE equation at 1 km
> To: <wrf-users at ucar.edu>
> Message-ID: <52B67E1F32707847B44B4B7B1238E363020D5504 at xmbv3801>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
> Dear wrf-users:
>
> I am attempting to model TKE with the WRF-ARW model using a horizontal
> resolution of 1 km and fairly high vertical resolution (~25 m in lowest 2
> km, ~250 m in next 8 km, then ~500 m).  The IC and
> LBCs are provided by the NCEP NAM model.  I am currently testing the TKE
> diffusion option (km_opt = 2) with
> diffusion calculated in physical space (diff_opt=2) and the PBL scheme
> turned off (bl_pbl_physics = 0).
> Unfortunately these runs are producing NANs in the output file for
> multiple variables.  I have tested with both surface layer formulations
> (sf_sfclay_physics = 1 and 2), but I see no improvement.  I have however had
> success when running with the Smagorinsky 2D deformation scheme (km_opt=4)
> and TKE provided by the MYJ PBL scheme (bl_pbl_physics=2).  The time step is
> 3 and 1/3 seconds.
>
> My question:  Can the diffusion TKE option be used at 1 km?  Are there
> other settings that should be changed to use it?
>
> Thanks,
>
> Eric Kemp
> Northrop Grumman Corporation/TASC
>
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> ------------------------------
>
> Message: 2
> Date: Fri, 27 Apr 2007 11:52:44 -0400
> From: "Kemp, Eric M." <Eric.Kemp at ngc.com>
> Subject: [Wrf-users] Minimum TKE with Mellor-Yamada-Janjic PBL
> To: <wrf-users at ucar.edu>
> Cc: "Alliss, Randall J." <Randall.Alliss at ngc.com>, "Felton,     Billy D."
>         <Billy.Felton at ngc.com>
> Message-ID: <52B67E1F32707847B44B4B7B1238E363020D5509 at xmbv3801>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
>
> Dear wrf-users:
>
> My group is attempting to simulate TKE with the WRF-ARW model at 1 km
> resolution.  We have noticed from both simulations and the source code that
> the minimum TKE permitted from the MYJ TKE scheme is 0.1 m^2 s^-2.  We
> understand there needs to be non-zero TKE for the turbulence closure to
> work, but we would like to know how this current threshold was chosen.  An
> earlier paper by Gerrity et al. (MWR, 1994) lists the TKE initial condition
> for the Eta model as 0.00001 m^2 s^-2.  A number of this magnitude might
> be more realistic in the stable free atmosphere.
>
> -Eric
>
> Eric M. Kemp
> Northrop Grumman Corporation/TASC
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> ------------------------------
>
> Message: 3
> Date: Fri, 27 Apr 2007 11:55:05 -0400 (EDT)
> From: "Elif SERTEL" <esertel at envsci.rutgers.edu>
> Subject: [Wrf-users] about model output
> To: wrf-users at ucar.edu
> Message-ID:
>         <3245.172.23.42.253.1177689305.squirrel at webmail.envsci.rutgers.edu
> >
> Content-Type: text/plain;charset=iso-8859-1
>
> Dear Users,
>
> I have 6 hourly model output results obtained from WRF-NMM. I used
> grib2ctl utility and convert my outputs into GrADS format. However after
> converting them, I am having 2 hours as time interval. How should I obtain
> 6 hour interval (like my model outputs) for my GrADS file?
>
> Best wishes,
> Elif.
>
> --
> Visitor Fulbright Researcher
> Rutgers University
> Departmet of Environmental Sciences
> http://www.envsci.rutgers.edu/~esertel/
>
> Res. and Teach. Assist. Elif SERTEL
> Istanbul Technical University
> Civil Engineering Faculty,
> Remote Sensing Division
> http://www.ins.itu.edu.tr/esertel/
>
>
>
>
> ------------------------------
>
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> End of Wrf-users Digest, Vol 32, Issue 20
> *****************************************
>



-- 
ANIL KUMAR ROHILLA
Meteorologist
Long Range Forecasting  Section
NATIONAL CLIMATE CENTER
O/o ADGM(Research)
India Meteorological Department
Shivaji Nagar
PUNE-411005.
INDIA
Mobile: 09422023277
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