[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[IDV #ZEO-881615]: Screen Capture and Other Issues



> Yuan,
> 
> And Equivalent Potential Temperature(Theta-E)?
> 
> Thanks!

This one is tricky, I can see the procedure of calculation is:


AdiabaticEquivalentTemperature is calculated from the temp and mixingratio

and 

PotentialTemperature is calculated from the pressure and 
AdiabaticEquivalentTemperaturet 
 

and 

EquivalentPotentialTemperature is PotentialTemperature.


Yuan
> 
> Stefan
> --
> Stefan Cecelski
> Ph.D. Candidate and Graduate Research Assistant
> AOSC Department: University of Maryland College Park
> 2343 Computer and Space Sciences Building(CSS #224)
> 703.801.1370
> address@hidden
> 
> On Tue, May 17, 2011 2:53 pm, Unidata IDV Support wrote:
> >> Julien,
> >>
> >> That is ok. Here are two I keep getting questions about:
> >>
> >> Horizontal Flux Divergence
> >
> > horizontal scalar flux divergence defined as u*(dp/dx) + v*(dp/dy) +
> > p*(du/dx + dv/dy)
> >> Potential Temperature
> >
> >   theta = t * (1000/p)** .286
> >
> > The url of the user guide may have some information you are looking for:
> >
> > http://www.unidata.ucar.edu/software/idv/docs/userguide/tools/JythonLib.html
> >
> >
> > Yuan
> >>
> >> Thanks!
> >>
> >> Stefan
> >> --
> >> Stefan Cecelski
> >> Ph.D. Candidate and Graduate Research Assistant
> >> AOSC Department: University of Maryland College Park
> >> 2343 Computer and Space Sciences Building(CSS #224)
> >> 703.801.1370
> >> address@hidden
> >>
> >> On Fri, May 13, 2011 1:58 pm, Unidata IDV Support wrote:
> >> >> Julien,
> >> >>
> >> >> Before we open another can of worms, I would like to make one
> >> request. I
> >> >> have convinced my research group at UMD to use IDV(~5 students). For
> >> our
> >> >> research, we NEED to know the formulas we use to calculate variables
> >> >> such
> >> >> as Theta-e, Horizontal Flux Divergence and so forth. There are
> >> copious
> >> >> ways of calculating these variables, and literature proves that some
> >> >> ways
> >> >> are more accurate than others. I would like to request that a PDF
> >> >> document, or some literature is created that lists how the derived
> >> >> variables in the IDV are calculated. I understand in the formula
> >> editor
> >> >> we
> >> >> can see which variables are going into it, but we need documentation
> >> on
> >> >> the actual formulas used. For example, there are at least 3 different
> >> >> ways
> >> >> to calculate Theta-e(Equivalent Potential Temp). It has been shown
> >> that
> >> >> the method by Bolton(~1980) is the best. Documentation of which
> >> formulas
> >> >> are used are essential for research as in peer-reviewed papers, you
> >> must
> >> >> know the formulas, and will be asked about them for the very reasons
> >> >> mentioned above. Thanks in advance.
> >> >>
> >> >> V/R,
> >> >>
> >> >> Stefan
> >> >> --
> >> >
> >> >
> >> > Stefan,
> >> >
> >> >       I believe there is no document available for these formulas.
> >> Most
> >> > formulas in the IDV were created by Don in Jython or Java, and I
> >> > believed he referenced those formulas in the GEMPAK. With limit
> >> > resources here, it is unlikely to spend more time to create the
> >> > document for these formulas. However, I can provide more details
> >> > information for specific formula if the request is raised.  Sorry
> >> > about the inconvenience.
> >> >
> >> >
> >> > Yuan
> >> >
> >> > Ticket Details
> >> > ===================
> >> > Ticket ID: ZEO-881615
> >> > Department: Support IDV
> >> > Priority: Normal
> >> > Status: Open
> >> >
> >> >
> >>
> >>
> >>
> >
> >
> > Ticket Details
> > ===================
> > Ticket ID: ZEO-881615
> > Department: Support IDV
> > Priority: Normal
> > Status: Open
> >
> >
> 
> 
> 


Ticket Details
===================
Ticket ID: ZEO-881615
Department: Support IDV
Priority: Normal
Status: Open


NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.