[gradsusr] How to compute quasigeostrophic potential vorticity in grads

[sushant puranik]

Hello
I want to solve following equation in grads
(∂/∂t +Vg·∇) q=0

where q is the sum of the geostrophic *relative* vorticity, the
*planetary*vorticity and the
*stretching* vorticity

anyone has idea or script about this?


Thank you
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