[ncl-talk] gsn_csm_pres_hgt

[Mary Haley]

​Hi Laura,

Would you be able to provide a clean version of your script​ and the data,
as per usual?

It seems like what you are doing is correct, and for the record, there is
no special weighting that goes on when the zonal means plot is created.

I was going to try to create an example for you, but your data sounds
unique enough (because it's MPAS and on multiple levels) that it would be
better if I could have your data.

Thanks,

--Mary





On Mon, May 14, 2018 at 5:40 PM, Laura Fowler <laura at ucar.edu> wrote:

> Hello:
>
> I would like to plot latitude versus pressure cross-sections from my
> MPAS outputs (the resolution of my MPAS mesh is about 30 km). The
> first thing that I did was to use the function
> ESMF_regrid_with_weights to regrid each output  to a 0.25 deg x 0.25
> deg horizontal resolution (720x1440) for each vertical level. Then, I
> used the function dim_avg_n_Wrap to calculate the zonal mean prior to
> using gsn_csm_pres_hgt.
>
> The plot "ZonalMeanTemperature.pdf" show the latitude versus pressure
> cross-sections which looks really boxy. In contrast, a 500 hPa map
> does not show the same boxiness with res at gsnZonalMean = True (see
> Temperature_500hPa.pdf). Other levels do not show any "boxiness"
> either.
>
> I assume that the "boxiness" in ZonalMeanTemperature.pdf results
> because I do not weigh the zonal means as a function of the area, but
> not sure, since I simply use dim_avg_n_Wrap.
>
> How can I reduce the boxiness of the pressure versus latitude
> cross-sections. Is there a "correction" of the zonal mean built in the
> function gsnZonalMean? Is there an ncl function that I can apply to
> the zonal mean to help reduce the step change in the temperature as a
> function of the latitude? Or is there an other gsn_csm_pres_hgt that
> includes a weighting function?
>
>
>
> Thanks,
> Laura
>
>
>
>
>
>
> --
> !-----------------------------------------------------------
> --------------------------------------------------
> Laura D. Fowler
> Mesoscale and Microscale Meteorology Division (MMM)
> National Center for Atmospheric Research
> P.O. Box 3000, Boulder CO 80307-3000
>
> e-mail: laura at ucar.edu
> phone: 303-497-1628
>
> !-----------------------------------------------------------
> --------------------------------------------------
>
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