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20020425: Gempak:BVSQ parameter



Patrick,

Yes, the apx B1 says that BVSQ(THTA) can be used for
either pressure or theta coordinates. Not for ZAGL.

You can use the GFUNC routines to compute N**2 on other coordinates:
g/LAV(thta) * [ LDF(thta) / LDF(hght) ]

Its the LDF(hght) function that is not general on other coordinates
where the name of the height variable or height level changes.

Steve CHiswell
Unidata User Support


>From: "Patrick O'Reilly" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200204252148.g3PLmca18018

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>In the Appendix of the Gempak User's Guide, it shows 2 ways which BVSQ =
>is calculated, one in pressure coordinates and the other in theta =
>coordinates.  Is it only the 2 coordinate systems that may be used with =
>this parameter?  I have interpolated eta212 grids from pres to zagl =
>successfully, and am having trouble with the BVSQ parameter. =20
>
>When using a layer, GLEVEL=3D10:1010, I get:
>
> GEMPAK-GDPLOT>r
> [DG -24]  IVCORD  %ZAGL in BVSQ is invalid.
> [GDPLOT 2]  The requested scalar/vector cannot be computed.
>
>
>
>
>I have run GDLIST and sure enough, THTA is there.  So I am thinking I =
>cannot use BVSQ(THTA) unless my GVCORD=3DPRES or THTA.  Is this correct?
>
>Patrick
>
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>Patrick O'Reilly                               Support Scientist
>The STORM Project            address@hidden
>208 Latham Hall                             ph: 319-273-3789
>University of Northern Iowa
>Cedar Falls, IA 50614            =20
>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  =20
>
>
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><HTML><HEAD>
><META http-equiv=3DContent-Type content=3D"text/html; =
>charset=3Diso-8859-1">
><META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR>
><STYLE></STYLE>
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><BODY bgColor=3D#efefef>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>In the Appendix of the Gempak =
>User's=20
>Guide, it shows 2 ways which BVSQ is calculated, one in pressure =
>coordinates and=20
>the other in theta coordinates.&nbsp; Is it only the 2 coordinate =
>systems that=20
>may be used with this parameter?&nbsp; I have interpolated eta212 grids =
>from=20
>pres to zagl successfully, and am having trouble with the BVSQ =
>parameter.&nbsp;=20
></FONT></DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT>&nbsp;</DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>When using a layer, =
>GLEVEL=3D10:1010, I=20
>get:</FONT></DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT>&nbsp;</DIV><FONT=20
>style=3D"BACKGROUND-COLOR: #ffffff" face=3D"MS Sans Serif" size=3D2>=20
>GEMPAK-GDPLOT&gt;r<BR>&nbsp;[DG -24]&nbsp; IVCORD&nbsp; %ZAGL in BVSQ is =
>
>invalid.<BR>&nbsp;[GDPLOT 2]&nbsp; The requested scalar/vector cannot be =
>
>computed.</FONT>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>&nbsp;</DIV>
><DIV><BR></DIV></FONT>
><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT>&nbsp;</DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>I have run GDLIST and sure =
>enough, THTA=20
>is there.&nbsp; So I am thinking I cannot use BVSQ(THTA) unless my =
>GVCORD=3DPRES=20
>or THTA.&nbsp; Is this correct?</FONT></DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT>&nbsp;</DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>Patrick</FONT></DIV>
><DIV><FONT face=3D"MS Sans Serif" size=3D2>&nbsp;</DIV></FONT>
><DIV><FONT face=3D"MS Sans Serif"=20
>size=3D2>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<BR>Patrick=20
>O'Reilly&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
>Support Scientist<BR>The STORM=20
>Project&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
> <A=20
>href=3D"mailto:address@hidden";>address@hidden</A><BR>20=
>8 Latham=20
>Hall&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
>sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
>p;&nbsp;&nbsp;&nbsp;&nbsp;=20
>ph: 319-273-3789<BR>University of Northern Iowa<BR>Cedar Falls, IA=20
>50614&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
>bsp;=20
><BR>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~&nbsp;&nbsp;=20
><BR></FONT></DIV></BODY></HTML>
>
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