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24 VERTICAL COORDINATES
GEMPAK supports the following known vertical coordinates:

Other vertical coordinates that GEMPAK doesn't know about can be handled as long as they are 4 letter representations, such as ETAL.

Interpolation and Transformation

Occasionally, the vertical coordinate on which data are available in there native format is not the optimum coordinate for performing analysis. Similarly, it is possible that data may not be provided at the desired level for analysis.

GEMPAK provides for interpolating to alternate levels and coordinates through the program GDVINT. Additionally, the grid area may be subsetted to a new grid file using GDVINT. If the output file does not currently exist, it will be created.

Here's one for practice:

  1. Convert the current ETA analysis to a THTA vertical coordinate.

  2. Construct a plot of Montgomery Stream Function (PSYM) on the 300K Theta surface for F000.
  3. Overlay pressure contours on your Montgomery Stream Function analysis to show vertical motion for air parcels.

 


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