[ncl-talk] gsn_csm_pres_hgt

[Laura Fowler]

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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