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20010504: gdvint, vertical interpolation

Luis,

You did not mention whether you had pressure on the 2 meter level
(or in the the initial data set).

In order to interpolate humidity parameters, the program will have
to have pressure to get specific humidity from mixing ratio, dewpoint
or the like. Specific humidity will be SPFH in the output data set.

Steve Chiswell
Unidata User Support




>From: LUIS M FARFAN <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200105041707.f44H7wp18228

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>I am using the gempak program gdvint to perform a vertical interpolation. My
>original grid is output from MM5, already converted in gempak format. The
>MM5 grid is in sgma coordinates and also contains fields at the surface level
>(i.e., none). The execution of the program is able to interpolate the 
>sgma fields
>into zagl at 2m for tmpk, urel, vrel and other fields. However, it does not
>interpolate the moisture fields (dwpk and mixr).
>
>The output lines generated by the gdvint execution indicate "DWPK found."
>and that "Interpolation is done. No errors", but DWPK does not show up in
>the new (GDOUTF) file. About mixr, it is not in the list of found functions an
> d
>it is not part of the new fields at zagl=2. These are the parameters 
>used in gdvint:
>  GDFILE   = fort.42_new_mm5.gem
>  GDOUTF   = int@2m_fort.42_new_mm5.gem
>  GDATTIM  = f24
>  GVCORD   = sgma:100/zagl
>  GLEVEL   = 2
>  MAXGRD   = 200
>  GAREA    = grid
>  VCOORD   = none
>
>I looked into the support archive and did not find discussions about 
>a problem similar
>to the one I have. Is there something fundamental in gdvint which 
>does not allow
>the interpolation of humidity fields that I have requested?
>
>Thanks,
>-- 
>Luis M Farfan.
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><!doctype html public "-//W3C//DTD W3 HTML//EN">
><html><head><style type="text/css"><!--
>blockquote, dl, ul, ol, li { margin-top: 0 ; margin-bottom: 0 }
> --></style><title>gdvint, vertical interpolation</title></head><body>
><div>I am using the gempak program gdvint to perform a vertical
>interpolation. My</div>
><div>original grid is output from MM5, already converted in gempak
>format. The</div>
><div>MM5 grid is in sgma coordinates and also contains fields at the
>surface level</div>
><div>(i.e., none). The execution of the program is able to
>interpolate the sgma fields</div>
><div>into zagl at 2m for tmpk, urel, vrel and other fields. However,
>it does not</div>
><div>interpolate the moisture fields (dwpk and mixr).</div>
><div><br></div>
><div>The output lines generated by the gdvint execution indicate
>&quot;DWPK found.&quot;</div>
><div>and that &quot;Interpolation is done. No errors&quot;, but DWPK
>does not show up in</div>
><div>the new (GDOUTF) file. About mixr, it is not in the list of
>found functions and</div>
><div>it is not part of the new fields at zagl=2. These are the
>parameters used in gdvint:</div>
><div><font size="-3" color="#000000">&nbsp;GDFILE&nbsp;&nbsp; =
>fort.42_new_mm5.gem<br>
>&nbsp;GDOUTF&nbsp;&nbsp; = int@2m_fort.42_new_mm5.gem<br>
>&nbsp;GDATTIM&nbsp; = f24<br>
>&nbsp;GVCORD&nbsp;&nbsp; = sgma:100/zagl<br>
>&nbsp;GLEVEL&nbsp;&nbsp; = 2<br>
>&nbsp;MAXGRD&nbsp;&nbsp; = 200<br>
>&nbsp;GAREA&nbsp;&nbsp;&nbsp; = grid</font></div>
><div><font size="-3" color="#000000">&nbsp;VCOORD&nbsp;&nbsp; =
>none</font><br>
><font size="-3" color="#000000"></font></div>
><div>I looked into the support archive and did not find discussions
>about a problem similar</div>
><div>to the one I have. Is there something fundamental in gdvint
>which does not allow</div>
><div>the interpolation of humidity fields that I have requested?</div>
><div><br></div>
><div>Thanks,</div>
>
><div>-- <br>
>Luis M Farfan.</div>
></body>
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