[gradsusr] W vector on north-south transect

[Jonathan Wynn Smith]

Are you saying the vectors that I have in the figure accurately depict the
vertical motion?

I do not want to display 3-d variables.  Just the vertical motion vector: W.

Unless I have some procedure wrong, the vectors in the figure will not
display with just W.

For example:

cannot use
d W

must use
d W,U or d W,V

for vectors to display.  Why is this?

Jonathan

On Mon, Sep 15, 2014 at 1:43 PM, Jeff Duda <jeffduda319 at gmail.com> wrote:

> Jonathan,
> I'm not sure I understand the difficulty you are facing.  GrADS cannot
> display three-dimensional vectors, so if you want to visualize all three
> components to the wind, one of them will have to be displayed as contours
> rather than as vectors.  The plot you attached makes sense if you want to
> look at advection of carbon monoxide along a north-south vertical cross
> section.
>
> Please clarify the problem.
>
> Jeff Duda
>
> On Mon, Sep 15, 2014 at 12:33 PM, Jonathan Wynn Smith <jwsmith9 at gmail.com>
> wrote:
>
>> Good afternoon:
>>
>> 'a = ave(U.1,t=289,t=1008,1)*100'
>> 'b = ave(V.1,t=289,t=1008,1)*100'
>>
>> 'c = ave(W.1,t=289, t=1008)*100'
>> "xcbar 1 10 0.3 0.5 -fw 0.175 -fh 0.175 -line on"
>>
>>
>> "set gxout vector"
>> 'd skip(c,6,3);skip(u,6,3)'
>>
>>
>> Above, GrADS is displaying a north-south transect of carbon monoxide with
>> vertical motion vectors.
>>
>> The W variable will not display vectors by itself. I actually will
>> display W contours but I need vectors. It seems that there has to be one of
>> the horizontal variables displayed in conjunction W for vectors to
>> display.  I chose U in the above case.  Does this mean the U component of
>> the vertical wind?
>>
>> Is it possible to print out the W vectors without the U or V components?
>>
>> I have attached a figure of what I am referring to.
>>
>> Thanks
>> Jonathan
>>
>> --
>> *Jonathan Wynn Smith, Ph.D.*
>> jonathan.smith at noaa.gov
>> 301-683-0500
>> Postdoctoral Research Associate
>> National Academy of Science/National Research Council Associateship
>> NOAA/NESDIS/STAR/SMCD, #2844
>> 5830 University Research Ct.
>> College Park, MD 20740-3818
>>
>>
>> *Lord, you establish peace for us; all that we have accomplished you have
>> done for us. - Isaiah 26:12*
>>
>>
>>
>>
>>
>>
>>
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>>
>
>
> --
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
>
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>
>


-- 
*Jonathan Wynn Smith, Ph.D.*
jonathan.smith at noaa.gov
301-683-0500
Postdoctoral Research Associate
National Academy of Science/National Research Council Associateship
NOAA/NESDIS/STAR/SMCD, #2844
5830 University Research Ct.
College Park, MD 20740-3818


*Lord, you establish peace for us; all that we have accomplished you have
done for us. - Isaiah 26:12*
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