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I am trying to locate saddle points or commonly known as "col" in synoptic meteorology. This is "z" in the following figure.enter image description here

References Here are some of the references regarding this.

a). http://www.zamg.ac.at/docu/Manual/SatManu/main.htm?/docu/Manual/SatManu/CMs/Def/backgr.htm

b). https://www.meted.ucar.edu/labs/synoptic/kinematics/vort_defzones/navmenu.php?tab=1&page=3-0-0&type=flash

What I want 1. I would like to know what are the characteristics of these points in terms of divergence, sea level pressure, relative humidity or moisture, etc. I will be automatically detecting these points from the given characteristics.

I'll appreciate any help.

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    $\begingroup$ Attaching a few references to your question as to what a col is may attract more votes. $\endgroup$
    – user1066
    Commented May 21, 2019 at 6:51
  • $\begingroup$ @gansub..as always..thanks for the prompt response. I added a few references. $\endgroup$
    – Lyndz
    Commented May 21, 2019 at 6:56
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    $\begingroup$ agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2012GL053097 From this reference surface pressure, wind velocity and heat flux all are a minimum. Remember what I wrote yesterday about curvature and saddle point. $\endgroup$
    – user1066
    Commented May 21, 2019 at 11:45
  • $\begingroup$ yes. thank you. I will also have to look into that. $\endgroup$
    – Lyndz
    Commented May 21, 2019 at 11:59
  • $\begingroup$ Mathematically, a saddle point is a minimum amongst one dimension and a maximum along another. The detection thereof should be straight forward. Also characteristics can have different meanings, are you referring to the propagating characteristics of a hyperbolic differential equation, or 'characteristic' as 'property'? $\endgroup$ Commented May 21, 2019 at 12:46

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