[NARCCAP-discuss] Wind Vectors

[Seth McGinnis]

Hi Jonas,

The u- and v-components of wind are true east-west and true north-south,
respectively.  If GrADS won't play nice with the data, maybe try NCL or
UV-CDAT.

Cheers,

--Seth

----
Seth McGinnis
NARCCAP Data Manager
Associate Scientist
IMAGe / NCAR
----

On Tue, 11 Dec 2012 14:34:53 -0330
 Jonas Roberts <jonaspmr at gmail.com> wrote:
>Hello,
>
>Do the u and v components of wind (for all pressure levels) follow true
>east-west and north-south or do they follow the i and j directions of each
>projection? (the website leads me to believe its true east-west,
>north-south, but I wanted to confirm)
>
>The reason I ask is that I'm using GrADS visualization software to analyze
>atmospheric moisture convergence for a variety of RCM-GCMs. GrADS does
>interpolations from predefined projections (polar stereographic, etc) to a
>standard lat-lon grid. As a part of this interpolation it assumes that the
>u and v wind vectors of the pre-interpolated data follow along the i and j
>directions respectively and not true east-west, north-south.
>
>Thanks for your time,
>Jonas Roberts
>PhD Candidate
>Faculty of Engineering and Applied Science
>Memorial University of Newfoundland
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