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The source processes for (vertical) vorticity in the baroclinic vorticity equation are the stretching, tilting and solenoidal terms. I understand that all of these terms go to zero in a barotropic setup; so what processes actually convert one form of vorticity to another (ex planetary to relative if you displace a parcel, such that absolute vorticity is conserved) in the barotropic case? How are these different from the baroclinic source processes?

The next part of my doubt is potential vorticity —> what extra ‘factor’ does it physically account for that absolute vorticity does not that allows it to be conserved even in the baroclinic case? What does it physically mean?

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    $\begingroup$ I think this should be split into two separate questions (the PV question is a different one?) $\endgroup$ Commented Apr 19 at 10:10

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