[ncl-talk] PLOTTING 95% STATISTICAL SIGNIFICANT WIND VECTORS

[Zeinab Salah]

Hi Dickson,

I have model output for u and v components every 6 hours, and I want to ask
you:
1- Is it better to calculate monthly mean of wind direction or calculate
the prevailing wind direction in this month?
2- Does the monthly mean of the direction give reasonable information?,
since if you have a perfect east wind and a perfect west wind and you want
to find the direction of their average.
3- Is there any function in NCL to calculate the dominant wind direction?
4- How do you calculate the composite of wind direction?

Thank you in advance.

Best regards,
Zeinab

‫في الجمعة، 22 مايو 2020 في 7:36 م تمت كتابة ما يلي بواسطة ‪dickson mbigi
via ncl-talk‬‏ <‪ncl-talk at ucar.edu‬‏>:‬

> Kindly hep/guidance,
> I did composite analysis of wind data and I need to plot only significant
> wind vectors. So far, I went through a related thread "
> https://www.ncl.ucar.edu/Support/talk_archives/2010/1031.html" but I
> couldnt figure out how to make it because it was not clear in this regard
> especially in carrying out t-test and subsequent plotting.
>
> Attached is my script which actual contain the whole  idea from the
> mentioned thread on performing t-test (refer line 127-149). Actually, the
> script plots zonal wind anomalies and overlaid wind vectors (attached
> picture).
>
> NB: Wind data is from NCEP-NCAR Reanalysis 1
>
> I would highly appreciate for any help.
>
> *Kindest regards,*
> *Dickson Mbigi,*
> *Institute of Atmospheric Physics,*
> *Chinese Academy of Sciences, China.*
>
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