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20020425: Gempak:BVSQ parameter
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- Subject: 20020425: Gempak:BVSQ parameter
- Date: Thu, 25 Apr 2002 16:29:35 -0600
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 >This is a multi-part message in MIME format. > >------=_NextPart_000_003C_01C1EC78.E2E3DFE0 >Content-Type: text/plain; > charset="iso-8859-1" >Content-Transfer-Encoding: quoted-printable > >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 > > >------=_NextPart_000_003C_01C1EC78.E2E3DFE0 >Content-Type: text/html; > charset="iso-8859-1" >Content-Transfer-Encoding: quoted-printable > ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> ><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> ></HEAD> ><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. Is it only the 2 coordinate = >systems that=20 >may be used with this parameter? I have interpolated eta212 grids = >from=20 >pres to zagl successfully, and am having trouble with the BVSQ = >parameter. =20 ></FONT></DIV> ><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT> </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> </DIV><FONT=20 >style=3D"BACKGROUND-COLOR: #ffffff" face=3D"MS Sans Serif" size=3D2>=20 >GEMPAK-GDPLOT>r<BR> [DG -24] IVCORD %ZAGL in BVSQ is = > >invalid.<BR> [GDPLOT 2] The requested scalar/vector cannot be = > >computed.</FONT> ><DIV><FONT face=3D"MS Sans Serif" size=3D2> </DIV> ><DIV><BR></DIV></FONT> ><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT> </DIV> ><DIV><FONT face=3D"MS Sans Serif" size=3D2>I have run GDLIST and sure = >enough, THTA=20 >is there. So I am thinking I cannot use BVSQ(THTA) unless my = >GVCORD=3DPRES=20 >or THTA. Is this correct?</FONT></DIV> ><DIV><FONT face=3D"MS Sans Serif" size=3D2></FONT> </DIV> ><DIV><FONT face=3D"MS Sans Serif" size=3D2>Patrick</FONT></DIV> ><DIV><FONT face=3D"MS Sans Serif" size=3D2> </DIV></FONT> ><DIV><FONT face=3D"MS Sans Serif"=20 >size=3D2>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<BR>Patrick=20 >O'Reilly  = >; = > =20 >Support Scientist<BR>The STORM=20 >Project = > <A=20 >href=3D"mailto:address@hidden";>address@hidden</A><BR>20= >8 Latham=20 >Hall &nb= >sp; &nbs= >p; =20 >ph: 319-273-3789<BR>University of Northern Iowa<BR>Cedar Falls, IA=20 >50614 &n= >bsp;=20 ><BR>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ =20 ><BR></FONT></DIV></BODY></HTML> > >------=_NextPart_000_003C_01C1EC78.E2E3DFE0-- >
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