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19990713: Gempak User Guide

John,

The distribution tar file includes the "doc" directory under
the root of the distribution tree, however, if your administrator
downloaded just the Linux executables and not the source distribution,
then that explains why you do not have  that directory.

You can pick this up from the gbuddy ftp directory without having to
download the whole source distribution though. You can download thie from:
~gbuddy/doc/guides/User_Guide.tar.gz

Steve Chiswell
Unidata User SUpport



>From: John Knox <address@hidden>
>Organization: .
>Keywords: 199907132035.OAA01013

>Dear Steve,
>
>Follow-up to and competitor for 'dumbest question': We 
>searched and searched but found nothing that appeared to be 
>the GEMPAK user guide in our computer files.  Perhaps 
>somehow our computer guru didn't obtain it when we got 
>started here?  We'd like to have it locally and printed 
>locally, so how can we rectify this situation?
>
>Thanks, and sorry for this,
>
>John
>
>On Tue, 13 Jul 1999 14:05:39 -0600 Unidata Support 
><address@hidden> wrote:
>
>> 
>> John,
>> 
>> If I did not mention in my original message to you regarding obtaining
>> the password to download the distribution and other instructions,
>> then I should have.
>> 
>> The User Guide is in the subdirectory:
>> $NAWIPS/doc/User_Guide
>> 
>> all the chapters are in postscript files which you can print locally.
>> 
>> Chapters 3 and 4 of the user guide are also available on the web in
>> HTML format. Chapters 3 and 4 are the parameter definitions and the
>> program refernce sections. You can access these pages as well as the tutoria
> l 
>> from the tutorial link at:
>> http://www.unidata.ucar.edu/packages/gempak/tutorial/
>> 
>> Follow the link to #3 (GEMPAK/N-AWIPS Users Manual)
>> 
>> Steve Chiswell
>> Unidata User Support
>> 
>> >From: John Knox <address@hidden>
>> >Organization: .
>> >Keywords: 199907131955.NAA29935
>> 
>> >Dear Support,
>> >
>> >Thanks again for your help.  Now, the dumbest question yet: 
>> >are we supposed to have a copy of the User Guide?  Or is it 
>> >on-line?  I'm not aware that we have a copy--on the other 
>> >hand, we got GEMPAK access during my first year of teaching 
>> >here at Valparaiso and almost anything could have happened 
>> >without my remembering it.
>> >
>> >If we're supposed to have a copy but don't, how do we 
>> >acquire one?  This will relieve you from answering future 
>> >dumb questions.
>> >
>> >Thanks,
>> >
>> >John
>> >
>> >On Tue, 13 Jul 1999 10:58:27 -0600 Unidata Support 
>> ><address@hidden> wrote:
>> >
>> >> >From: John Knox <address@hidden>
>> >> >Organization: .
>> >> >Keywords: 199907131559.JAA22150
>> >> 
>> >> >Dear Support,
>> >> >
>> >> >We've got another relatively simple question.  We need to 
>> >> >be precise in our calculation of potential vorticity.  
>> >> >While there are several options for calc'g PV, we need to 
>> >> >know exactly how PVOR is doing its calculations.  Where do 
>> >> >we look in the code for these details?
>> >> >
>> >> >Thanks for your earlier help; we were able to clear up a 
>> >> >long-standing problem with the calculation of divergence 
>> >> >tendency.
>> >> >
>> >> >Sincerely,
>> >> >
>> >> >John Knox
>> >> >address@hidden
>> >> >
>> >> >
>> >> 
>> >> John,
>> >> 
>> >> The grid diagnostic function calculations are shown in Appendix B of the
>> >> User Guide, and the code for calculating PVOR is found in:
>> >> $GEMPAKHOME/source/gemlib/dv/dvpvor.f
>> >> 
>> >> 
>> >> Here is the function header:
>> >>         SUBROUTINE DV_PVOR ( iret )
>> >> C************************************************************************
>> >> C* DV_PVOR                                                              *
>> >> C*                                                                      *
>> >> C* This subroutine computes the potential vorticity in a layer from     *
>> >> C* scalar (thermal and pressure) and vector (wind) fields:              *
>> >> C*                                                                      *
>> >> C*     PVOR ( s, V ) = - GRAVTY * AVOR ( VLAV (V) ) * LDF ( CTA ) /     *
>> >> C*                  ( 100 * LDF ( PRES ) )                              *
>> >> C*                                                                      *
>> >> C*                  Where: 100 converts millibars to Pascals            *
>> >> C*                         CTA can be THTA, THTE, or THES               *
>> >> C*                                                                      *
>> >> C* PVOR works on a layer in THTA or PRES coordinates.  In the case of   *
>> >> C* PRES, the vorticity of the layer averaged wind is corrected by       *
>> >> C* the addition of ( k cross partial V w.r.t. CTA ) dot grad (CTA).     *
>> >> C* PVOR generates a scalar grid.                                        *
>> >> 
>> >> 
>> >> Steve Chiswell
>> >> 
>> >> *************************************************************************
> ***
>> >> Unidata User Support                                    UCAR Unidata Prog
> ram
>> >> (303)497-8644                                                  P.O. Box 3
> 000
>> >> address@hidden                                   Boulder, CO 80
> 307
>> >> -------------------------------------------------------------------------
> ---
>> >> Unidata WWW Service                        http://www.unidata.ucar.edu/  
>    
>> >> *************************************************************************
> ***
>> >
>> >------------------------------------------------
>> >Dr. John A. Knox
>> >Assistant Professor of Geography and Meteorology
>> >Room 15, Mueller Hall
>> >Valparaiso University
>> >Valparaiso, IN 46383
>> >E-mail: address@hidden
>> >Office Phone: 219-464-6003
>> >
>> 
>> ****************************************************************************
>> Unidata User Support                                    UCAR Unidata Program
>> (303)497-8644                                                  P.O. Box 3000
>> address@hidden                                   Boulder, CO 80307
>> ----------------------------------------------------------------------------
>> Unidata WWW Service                        http://www.unidata.ucar.edu/     
>> ****************************************************************************
>
>------------------------------------------------
>Dr. John A. Knox
>Assistant Professor of Geography and Meteorology
>Room 15, Mueller Hall
>Valparaiso University
>Valparaiso, IN 46383
>E-mail: address@hidden
>Office Phone: 219-464-6003
>