Constant absolute vorticity trajectory

constant absolute vorticity trajectory

(Abbreviated CAVT.) The path of an air parcel with absolute vorticity that remains constant in horizontal flow.

Before the advent of modern numerical weather prediction, these trajectories, in conjunction with the theory of Rossby waves, were frequently used to forecast the movement of long tropospheric waves.

Pettersen, S. 1956. Weather Analysis and Forecasting. 2d ed., Vol. I, . 146–148, 171–176, 414–419.

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1. The vorticity of a fluid particle determined with respect to an absolute coordinate system.
   The absolute vorticity vector is defined by 2Ω + ∇ × u, where Ω is the earth's angular velocity vector and u is the three-dimensional relative velocity vector.
   
2. The vertical component η of the absolute vorticity vector (as defined above) given by the sum of the vertical component of the vorticity with respect to the earth (the relative vorticity) ζ and the vorticity of the earth (equal to the Coriolis parameter) f: