Hello,
Please read and examine:
http://www.ncl.ucar.edu/Applications/skewt.shtml
-------
http://www.ncl.ucar.edu/Applications/skewt.shtml
[1] As noted in the documentation
It is designed to reproduce the "USAF Skew-t, log p diagram (form
dod-wpc 9-16-1).
The USAF skew-t only goes to 100mb.
You would have to copy the code
%> $NCARG_ROOT/lib/ncarg/nclscripts/csm/skewt_func.ncl my.skewt_func.ncl
and alter the code.
[2] See Example 1
[3] CAPE calculation is somewhat sensitive to where the
ascent is started. There are a number of CAPE codes tested
and none agreed. There are two CAPE calculations: one by
the WRF project and another that is included with NCL but is not
documented.
[4] I think the easiest way to accomplish )say) every 5th wind would be
to do something like
uu = u
vv = v
uu@_Fillvalue = u@_FillValue
uu@_Fillvalue = u@_FillValue
uu(::5) = u(::5)
vv(::5) = v(::5)
[5] Isn't that the adibatic lapse rate!
Again, you would have to modify the code.
[6] When you open the work station
wks = gsn_open_wks ("png", "skewt")
Good luck
On 3/9/14, 9:19 AM, Gökhan Sever wrote:
> Hello,
>
> I have some questions about a Skew-T Log-P plot produced in NCL. Consider
> the attached Weisman and Klemp (1982) type sounding as a reference, created
> from an idealized WRF simulation output.
>
> 1) How to set y-axis upper limit to, say 10 mb instead of the default 100
> mb?
>
> 2) How to change the green-white alternating background to white only?
>
> 3) The input data before calling skewT_PlotData are interpolated (using 100
> vertical levels instead of 50) in my case, otherwise CAPE estimation seems
> to be off by a couple hundred J/kg. However, as an artifact, there are so
> many wind barbs are plotted. Is there a way to plot barbs, say at every 5
> points?
>
> 4) How to move the barb axis or height axis so that the plot looks more
> compact? I am only interested in u-wind, so these two axes really can be
> combined.
>
> 5) What is the straight grey line ascending from in between 8-12 g/kg
> mixing ratio lines up above? Is there a way to suppress it?
>
> 6) Is there a way to save SkewT plot directly to png or jpg? It's easy to
> save in PDF, however I couldn't figure out a way to directly saving as a
> png or jpg.
>
> Many thanks.
>
>
>
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Received on Mon Mar 10 10:30:16 2014
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