[Wrf-users] NCL scripts
HEDDE Thierry 137147
thierry.hedde at cea.fr
Tue Oct 3 23:52:27 MDT 2017
Hi Nafiseh,
If you type NCL scripts for WRF" in Google, you'll find directly the site : https://www.ncl.ucar.edu/Applications/wrf.shtml
To start with WRF graphics I would advise you to use Panoply form the NASA : https://www.giss.nasa.gov/tools/panoply/
Panoply enables you to look at your data directly (like LandUse), NCL is great for automatic image generation or more elaborated outputs but is not so easy to use!
Best regards
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Message: 1
Date: Mon, 02 Oct 2017 17:25:27 -0400
From: Nafiseh Haghtalab <haghtala at msu.edu>
To: Wrf-users at ucar.edu
Subject: [Wrf-users] NCL scripts
Message-ID: <20171002172527.12234c5r40ra5ubr at mail.msu.edu>
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Dear users,
How can I download some of the ncl scripts to plot my wrfout file?
I need to plot land use, precip, topography, and produce some graphs.
Thanks,
Nafiseh Haghtalab
PhD Candidate,
Department of Geography, Environment, and Spatial Sciences, Michigan State University
------------------------------
Message: 2
Date: Tue, 3 Oct 2017 11:59:16 +0300
From: Barry Lynn <barry.h.lynn at gmail.com>
To: HEDDE Thierry 137147 <thierry.hedde at cea.fr>
Cc: "wrf-users at ucar.edu" <wrf-users at ucar.edu>, "wrfhelp at ucar.edu"
<wrfhelp at ucar.edu>
Subject: Re: [Wrf-users] Some Notes About CFLS
Message-ID:
<CAN7Bv2481fbrmP831LPhO_=rGMQ3mwzdYyTGOkEejWN2PQzW_w at mail.gmail.com>
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Hi Thierry:
Thanks for making me aware of this.
It looks like it could be very helpful.
At the moment, with the setup I have, I haven't had a CFL complaint yet, but the run has a long way to go.
I wonder how sensitive results are to time step. I mention this because if you are trying to compare forecasts at different resolutions and the time steps are different (meaning as a multiple of grid spacing), then this might affect the validity of the comparison.
Barry
On Tue, Oct 3, 2017 at 10:44 AM, HEDDE Thierry 137147 <thierry.hedde at cea.fr>
wrote:
> Hi Barry and thanks for the CFLs notes
>
> I would add to point 5 (reduce time step)
> 6) Use the adaptative_time_step option which is working well with WRF
> 3.9.1 Here is the classical tuning, I'm using for it (-1 means :
> automatic) for a 2 domains run (9km, 3km) fed with gfs 0.25?
>
> &domains
> use_adaptive_time_step = .true.,
> step_to_output_time = .true.,
> target_cfl = 1.2, 1.2
> target_hcfl = .84, .84,
> max_step_increase_pct = 5, 51,
> starting_time_step = -1, -1,
> max_time_step = -1, -1,
> min_time_step = -1, -1,
> adaptation_domain = 1,
>
> I'm testing it for my operational daily prognostics over France and as
> far as now, I've noticed no crash, it's quicker and the prognostic
> quality looks the same (qualitatively) The timestep is mainly at 8*DX
> during the run but sometimes adapts itself down to 4*DX Cheers Thierry
>
> -----Message d'origine-----
> De : Wrf-users [mailto:wrf-users-bounces at ucar.edu] De la part de
> wrf-users-request at ucar.edu Envoy? : lundi 2 octobre 2017 17:10 ? :
> wrf-users at ucar.edu Objet : Wrf-users Digest, Vol 158, Issue 1
>
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> Today's Topics:
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> 1. Some Notes About CFLS (Barry Lynn)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 1 Oct 2017 19:36:17 +0300
> From: Barry Lynn <barry.h.lynn at gmail.com>
> To: wrf-users at ucar.edu
> Cc: wrfhelp <wrfhelp at ucar.edu>
> Subject: [Wrf-users] Some Notes About CFLS
> Message-ID:
> <CAN7Bv264m961RoHS2DXr42pJkF8yiHEutjBTXQ3Ok1by990FfA at mail.
> gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello:
>
> I had some problems with CFLS when setting up my 12/4 km domain.
>
> I had particular points which (at almost every time step) had CFL "errors."
>
> There are few things to do about this.
>
> 1) Change epssm to be closer to 0.5, rather than 0.1 (or 0.2).
>
> 2) Set smooth_option = 2 (this smoothes near the boundaries of the
> inner
> domain.)
>
> 3) Set smooth_cg_top = .true. (smoothes topography near boundary of
> outer
> domain.)
>
> These steps together can reduce the number of CFLs.
>
> 4) damp_opt = 3 (reduces upper level instability; CFLs occurring at
> upper levels).
>
> However, one other, but very important note, is to be sure to place
> the boundaries of the inner domain away from steep terrain (see
> attached pdf. I had CFLS near the right boundary until I moved the
> right upper boundary into the water.)
>
> 5) Lastly, if you get CFLs during severe or strong storms, you may
> have to reduce the timestep from 6 to 5 or even 4 times the grid size
> (at least until you've passed the period of greater model instability).
>
> Barry Lynn
>
>
>
> --
> Barry H. Lynn, Ph.D
> Senior Lecturer,
> The Institute of the Earth Science,
> The Hebrew University of Jerusalem,
> Givat Ram, Jerusalem 91904, Israel
> Tel: 972 547 231 170
> Fax: (972)-25662581
>
> C.E.O, Weather It Is, LTD
> Weather and Climate Focus
> http://weather-it-is.com
> Jerusalem, Israel
> Local: 02 930 9525
> Cell: 054 7 231 170
> Int-IS: x972 2 930 9525
> US 914 432 3108
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--
Barry H. Lynn, Ph.D
Senior Lecturer,
The Institute of the Earth Science,
The Hebrew University of Jerusalem,
Givat Ram, Jerusalem 91904, Israel
Tel: 972 547 231 170
Fax: (972)-25662581
C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108
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Message: 3
Date: Tue, 3 Oct 2017 17:55:35 +0400
From: Michael Weston <mjweston at masdar.ac.ae>
To: <wrf-users at ucar.edu>
Subject: [Wrf-users] SQVISC, what is it and what unit?
Message-ID: <40cce2ac-ec36-1d89-ba02-7cc4d4b66099 at masdar.ac.ae>
Content-Type: text/plain; charset="utf-8"; Format="flowed"
Dear WRF users,
Can anyone please tell me what SQVISC is, what unit it is in and where this constant comes from?
It is, I suppose, the square of the viscosity of air, based on Cheng and Zhang 2009 and how it is used in the code, but I cannot work out which unit it is in.
module_sf_noahmplsm.F
REAL, PARAMETER :: SQVISC = 258.2
It is also used here:
module_bl_myjpbl.F: & ,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_bl_myjurb.F: & ,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_bl_qnsepbl.F: &
,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_bl_shinhong.F: &
,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_sf_myjsfc.F: & ,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_sf_noahmplsm.F: REAL, PARAMETER :: SQVISC = 258.2
module_sf_qnsesfc.F: & ,SQPR=0.84,SQSC=0.84,SQVISC=258.2,TVISC=2.1E-5 &
module_sf_urban.F: & ,SQVISC = 258.2)
Any assistance would be appreciated
Thank you
--
*Michael****Weston**
*Research Engineer
*A Part of Khalifa University of Science and Technology*
PO Box 54224, Abu Dhabi,
United Arab Emirates
Office +971 2 810 9510
Email mjweston at masdar.ac.ae <mailto:mjweston at masdar.ac.ae> http://www.masdar.ac.ae <http://www.masdar.ac.ae/>
**
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