[ncl-talk] Vertical motion with zonal wind

[Jenny Taylor]

Mary,

I was trying with the following attached script. But vertical motion near
the equator, as well as the 30S and 30N, shows rising motion in the output
which is not correct in real term. Please kindly look into my script and
figure and inform me what I am missing or doing any wrong in this.

Data structure is below;

Variable: t
Type: float
Total Size: 655360 bytes
            163840 values
Number of Dimensions: 4
Dimensions and sizes:   [time | 1] x [lev_p | 20] x [lat | 64] x [lon | 128]
Coordinates:
            time: [ 791.. 791]
            lev_p: [950..50]
            lat: [-87.8638..87.8638]
            lon: [ 0..357.1875]
Number Of Attributes: 1
  _FillValue :  9.96921e+36

Variable: u
Type: float
Total Size: 655360 bytes
            163840 values
Number of Dimensions: 4
Dimensions and sizes:   [time | 1] x [lev_p | 20] x [lat | 64] x [lon | 128]
Coordinates:
            time: [ 791.. 791]
            lev_p: [950..50]
            lat: [-87.8638..87.8638]
            lon: [ 0..357.1875]
Number Of Attributes: 1
  _FillValue :  9.96921e+36

Variable: v
Type: float
Total Size: 655360 bytes
            163840 values
Number of Dimensions: 4
Dimensions and sizes:   [time | 1] x [lev_p | 20] x [lat | 64] x [lon | 128]
Coordinates:
            time: [ 791.. 791]
            lev_p: [950..50]
            lat: [-87.8638..87.8638]
            lon: [ 0..357.1875]
Number Of Attributes: 1
  _FillValue :  9.96921e+36

Variable: w
Type: float
Total Size: 655360 bytes
            163840 values
Number of Dimensions: 4
Dimensions and sizes:   [time | 1] x [lev_p | 20] x [lat | 64] x [lon | 128]
Coordinates:
            time: [ 791.. 791]
            lev_p: [950..50]
            lat: [-87.8638..87.8638]
            lon: [ 0..357.1875]
Number Of Attributes: 1
  _FillValue :  9.96921e+36


Thanking you,
Jenny


On Thu, Feb 22, 2018 at 1:17 AM, Mary Haley <haley at ucar.edu> wrote:

> Jenny,
>
> In order to do plot overlays of different variables, you need to use the
> "overlay" procedure in NCL.
>
> ----------------------------------------------------------------
>
> The overlay procedure works one of two ways:
>
> [1] It overlays data from one plot (called the "overlay" plot) into the
> data space of another plot (called the "base" plot).
>
> The two plots must have intersecting data spaces for this to work. By
> "data space", I mean the range of the X and Y axes of the two plots must
> intersect. Otherwise, you will not see the overlay plot at all.
>
> For an example, see overlay_8.ncl at:
>
> http://www.ncl.ucar.edu/Applications/overlay.shtml#ex8
>
> [2] It simply "lines up" the two plots in the same rectangular region and
> draws them. It's not as common to do overlays this way, because it requires
> that you do all the work of making sure the two plots are in the same data
> space.
>
> For an example, see overlay_9.ncl at:
>
> http://www.ncl.ucar.edu/Applications/overlay.shtml#ex9
>
> ----------------------------------------------------------------
>
> It doesn't matter whether you are doing contour plots, vector plots, or XY
> plots: you can overlay any of these on another one using the "overlay"
> procedure.
>
> The "overlay" examples page has several other scripts showing how to use
> the overlay procedure. In particular, you might want to look at
> overlay_1.ncl, overlay_6.ncl, and/or wrf_gsn_5.ncl:
>
> http://www.ncl.ucar.edu/Applications/overlay.shtml
>
> If you continue to have problems, please post back to ncl-talk and include
> your script and a "printVarSummary" of the data you are trying to plot.
>
> Thanks,
>
> --Mary
>
>
> On Fri, Feb 16, 2018 at 9:59 AM, Jenny Taylor <jenny63taylor91 at gmail.com>
> wrote:
>
>> Dear NCL Users,
>>
>> I am trying to plot vector wind field at different pressure level for
>> latitute range 40N-40S. I am following the below mention script;
>> https://www.ncl.ucar.edu/Applications/Scripts/h_lat_7.ncl
>>
>> I am trying to overlay vertical motion (rising/sinking) in vector arrows
>> and zonal wind in color scheme.
>>
>> Can anyone suggest me, in that case which funtion I need to use in it?
>> Any help will be appriciated.
>>
>> Thanks,
>> Jenny
>>
>> _______________________________________________
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>
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