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

[IDV #OMA-852870]: How to subtract off a mean profile or standard atmosphere profile?

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [IDV #OMA-852870]: How to subtract off a mean profile or standard atmosphere profile?
  • Date: Thu, 20 Dec 2012 09:59:22 -0700
> Hello IDV folks.
> 
> For fields like T or theta or geopotential, I wish I could remove a reference 
> profile
> T(p) to subtract off the huge vertical gradient, so that horizontal gradients
> (which are so crucial for dynamics) can be discerned better in cross sections.
> 
> Is there a way to subtract a zonal mean, or the global mean, or even a
> standard atmosphere, from every column in a 3D grid?
> I can't find anything useful in here.
> http://www.unidata.ucar.edu/software/idv/docs/userguide/tools/JythonLib.html
> 

Brian,
     We do have some examples in the workshop document:

http://www.unidata.ucar.edu/software/idv/docs/workshop/formulas/MoreWithJython.html


I am not fully understanding your requirement, but this may help.


Yuan
> 
> I thought about subtracting the initial TIME using 
> differenceFromBaseTime(field),
> but this introduces a lot of spatial structure from the initial spatial 
> fields,
> obscuring the structure of the time being analyzed.
> 
> 
> Thanks for any suggestions.
> And Merry Christmas!
> Brian
> 
> Brian Mapes
> address@hidden<mailto:address@hidden> or address@hidden<mailto:address@hidden>
> 
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: OMA-852870
Department: Support IDV
Priority: Normal
Status: Closed