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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear Dennis,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In the function pot_vort_isobaric, the isenbaric PV is calculated as follows<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'> <i>vr = vr + conform(vr,f,nlt) ; absolute vorticity<o:p></o:p></i></p><p class=MsoNormal style='margin-left:.5in'><i> s = where(s.eq.0, s@_FillValue, s) ; safety<o:p></o:p></i></p><p class=MsoNormal style='margin-left:.5in'><i> con = R/(s*conform(t,p,npr))<o:p></o:p></i></p><p class=MsoNormal style='margin-left:.5in'><i> ; G* added to get common pv units<o:p></o:p></i></p><p class=MsoNormal style='margin-left:.5in'><i> pv = -G*(vr + con*(dvdp*dtdx-dudp*dtdy))*dthdp<o:p></o:p></i></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>where the static stability (s) is computed by the function static_stability<o:p></o:p></p><p class=MsoNormal style='text-indent:.5in'><i>s = -T*d[log(theta)]/dp = -(T/theta)*d(theta)/dp<o:p></o:p></i></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>(1)If so, I think the variable con should be<o:p></o:p></p><p class=MsoNormal> con = 1/s<o:p></o:p></p><p class=MsoNormal>(2) Or, the static stability (σ) is computed by the function by the following formula <o:p></o:p></p><p class=MsoNormal style='text-indent:.5in'><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#222222;background:white'>Holton, James R., and Gregory J. Hakim.<span class=apple-converted-space> </span><i>An introduction to dynamic meteorology</i>. Vol. 88. Academic press, 2012. pp496</span><o:p></o:p></p><p class=MsoNormal> σ = -R*T<span style='font-size:9.0pt'>0</span>/p* dln ϴ/dp<o:p></o:p></p><p class=MsoNormal> then,<o:p></o:p></p><p class=MsoNormal> con =R/(s*p), just as c<i>on = R/(s*conform(t,p,npr))</i><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Andy<o:p></o:p></p></div></body></html>