[ncl-talk] wrf_Hill2d

[Dennis Shea]

Not sure  how to answer. This is 'kinda' a mixed WRF model and NCL question.

The "wrf_Hill2d.ncl" example was written by  WRF people, not NCL developers.
Part of this question relates to WRF model [fortran] input via the
(fortran) '*namelist'* which allows  *passing keyword-value pairs*. It is
not NCL.
I have no idea what the units are.

[ FTR: NCL does have a function that mimics fortran's NAMELIST:
*keyword_values*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/keyword_values.shtml>
]

Further, an error was discovered in the function [ *wrf_user_intrp3d
<https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_intrp3d.shtml>
*] used by the example. Please read the "*Description"* section of the
function's documentation. This includes:  This function is deprecated in
NCL version 6.6.0. Use *wrf_user_interp_level*
<https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_interp_level.shtml>
for horizontal interpolations and *wrf_user_vert_cross*
<https://www.ncl.ucar.edu/Document/Functions/WRF_arw/wrf_user_vert_cross.shtml>
for vertical cross sections.


[1] re: "Just to be sure, is x axis "west-east grid point" and y axis
"height in meter"?"

(a) x axis "west-east grid point"
      *I think* it refers to the 'horizontal path' of the cross section ...
not necessarily a strict  'west-east' path

(b) y axis "height in meter"
      *I think* it refers to either height or pressure axis of the cross
section

WRF experts will have to verify.

===
[2] re: "If yes, with changing the height of hill in the
dyn_em/module_initialize_hill2d_x.F, we should change this line in the
wrf_Hill2d.ncl, too? I've attached the default module_initialize_hill2d_x.F
."

Again, this is better answered by WRF experts.

Good Luck




On Sat, Dec 26, 2020 at 5:38 AM Ehsan Taghizadeh via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> "Correction for the previous email"
> In the previous email, I've asked "Does the value of "100" in the above
> line is the height of hill in the default namelist.input?". It seems the
> height of hill is not in the namelist.input and it sets in the "
> dyn_em/module_initialize_hill2d_x.F". So, I correct my question "Does the
> value of "100" in the above line is the default height of hill in the
> dyn_em/module_initialize_hill2d_x.F?" If yes, with changing the height of
> hill in the dyn_em/module_initialize_hill2d_x.F, we should change this
> line in the wrf_Hill2d.ncl, too? I've attached the default
> module_initialize_hill2d_x.F.
>
> *Sincerely,*
> *Ehsan*
>
> On Saturday, December 26, 2020, 03:52:41 PM GMT+3:30, Ehsan Taghizadeh via
> ncl-talk <ncl-talk at mailman.ucar.edu> wrote:
>
>
> Dear NCL group,
> I hope you are doing great.
> I've used "wrf_Hill2d.ncl" from "
> https://www2.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/wrf_Hill2d.ncl".
> This is a very useful script. Just to be sure, is x axis "west-east grid
> point" and y axis "height in meter"?
> In the script, has been written
>   res at tmYLValues  = fspan(0.,100.,5)
> Does the value of "100" in the above line is the height of hill in the
> default namelist.input? If yes, with changing the height of hill in the
> namelist.input, does we should change this line in the wrf_Hill2d.ncl, too?
> I've attached the default namelist.input.
> I'll be thankful if I hear from you.
>
> *Sincerely,*
> *Ehsan*
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