A kinetic generalization of a Taylor identity appropriate to a strongly magnetized plasma is
derived. This relation provides an explicit link between the radial mixing of a four–
dimensional (4D) gyrocenter fluid and the poloidal Reynolds stress. This kinetic analog of a
Taylor identity is subsequently utilized to link the turbulent transport of poloidal momentum to
the mixing of potential vorticity. A quasilinear calculation of the flux of potential vorticity is
carried out, yielding diffusive, turbulent equipartition, and thermoelectric convective …