Re: Vertical cross section and vectors

Thanks Dai - I tried multiplying the /w/ component by 1000, but no luck
with the plot. I'm not sure what you mean by "and the vertical altitude"?

Regards
Tess

??? wrote:
> Tess,
> You can multiply 1000 to your w-wind and the vertical altitude, so
> that the vertical motion will be evident.
> Good luck!
>
> Dai
>
> 2012/7/24 Tess Parker <tess.parker@monash.edu
> <mailto:tess.parker@monash.edu>>
>
> Hello all - I am trying to plot a vertical cross section, against
> altitude in meters, along a particular line of longitude, with
> vectors representing the winds.
>
> I have used ERA-Interim data, with /v/ for the meridional wind and
> a calculated vertical wind /w/ from the ERAI omega vertical
> motion, so both /v/ and /w/ are in units of m/s. These are on
> pressure levels, so I have used the ERAI geopotential field /z/ to
> calculate a height in meters for each grid point (pressure level,
> lat, lon). I have then used the /int2p_n/ function to interpolate
> the /v/ and /w/ arrays to altitude levels using the height field.
> All good so far.
>
> The problem I am having is in trying to plot the wind vectors. My
> cross section should run from 90 deg South to the equator, and
> from the surface to about 20,000 meters altitude. I understand
> that the aspect ratio of this plot will cause a problem; the
> horizontal axis scale is about 10^7 meters, and the vertical only
> about 10^4. Also, the horizontal component of the wind /v/ is of
> order of magnitude 10, and the vertical only about 0.01. The
> question is, how do I get the vectors to plot so that upward or
> downward motion is clearly evident? And how can I be sure that the
> vectors represent the true angle of the vector wind field, which
> is of great importance in this particular case?
>
> Many thanks for any assistance!
>
>
> --
> Tess Parker
> PhD Candidate
> School of Mathematical Sciences
> Room 225, Building 28
> Monash University, Clayton VIC 3800
> Phone: +61 3 9905 4458
>
>
>
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>

-- 
Tess Parker
PhD Candidate
School of Mathematical Sciences
Room 225, Building 28
Monash University, Clayton VIC 3800
Phone: +61 3 9905 4458

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Received on Mon Jul 23 22:43:29 2012