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Which sum gives the absolute vorticity?

  • A.Relative plus planetary vorticity
  • B.Relative vorticity multiplied by the Coriolis parameter at the latitude of the parcel concerned
  • C.Relative minus planetary vorticity
  • D.The circulation around a closed loop divided by the area that the loop encloses within the flow

Answer: A

Absolute vorticity is the vorticity seen from an inertial frame, which is the relative vorticity plus the planetary vorticity. It is the quantity conserved for frictionless barotropic flow without divergence, and it is what makes air moving poleward turn anticyclonically. The final option is a correct statement of the relationship between circulation and mean vorticity, but it defines mean vorticity rather than absolute vorticity specifically. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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