Re: divergent wind with missing value

From: Takeshi Enomoto (eno AT jamstec.go.jp)
Date: Thu Jul 07 2005 - 03:38:13 MDT

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    Hi Jerry

    dv2uvf calculates div wind by spherical transform.
    Thus missing values are not allowed.

    <http://www.ncl.ucar.edu/Document/Functions/Built-in/dv2uvf.shtml>

    If you have model sigma (or eta) levels,
    you could extrapolate values under the surface.

    <http://www.ecmwf.int/research/ifsdocs/CY25r1/Technical/Technical-3
    -05.html>

    There are NCL functions to do vertical interpolation.
    However I use Fortran for this purpose to gain performance and I/O
    flexibility.
    <http://www.ncl.ucar.edu/Document/Functions/Built-in/vinth2p.shtml>
    <http://www.ncl.ucar.edu/Document/Functions/Built-in/
    vinth2p_ecmwf.shtml>

    I am not familiar with horizontal interpolation algorithms.
    Someone else could help you with this.

    Takeshi

    On 2005/07/07, at 18:14, jerry wrote:

    > Hi
    > i use function "dv2uvf(dv,ud,vd)" to calculate divergent wind.
    > if the value dv have  missing value .
    > How  can i get the divergent wind?
    >  
    > thank you _______________________________________________
    > ncl-talk mailing list
    > ncl-talk@ucar.edu
    > http://mailman.ucar.edu/mailman/listinfo/ncl-talk

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