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Potential Vorticity (PV) @ 350K

Large Scale Rossby waves amplifying and breaking as they approach weak ambient flow in the subtropics. Potential Vorticity (PV) @ 350K. Red=isentropic sfc Black=iso-PV sfc Blue=zonal wind speed. PV @ 350K. Latitudinal PV gradient : restoring mechanism for Rossby waves - waveguide. 4.

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Potential Vorticity (PV) @ 350K

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  1. Large Scale Rossby waves amplifying and breaking as they approach weak ambient flow in the subtropics Potential Vorticity (PV) @ 350K

  2. Red=isentropic sfc Black=iso-PV sfc Blue=zonal wind speed PV @ 350K Latitudinal PV gradient: restoring mechanism for Rossby waves - waveguide

  3. 4 INTERANNUAL VARIABILITY EL NINO LA NINA

  4. 8 PWB along the Stratospheric Vortex PV on the 1100K surface for February 1999 Abatzoglou and Magnusdottir, Quarterly Journal of the Royal Meteorological Society (in prep)

  5. EP flux convergence mean flow deceleration Critical line Latitude Wave-mean flow interaction Wave Propagation Dynamical Mechanism • Poleward reflection near breaking level drives waves toward high-latitudes • Wave convergence decelerates mean flow; critical line established • Further vertical wave propagation is effectively trapped below critical line. • Waves converge onto progressively lower levels of the atmosphere, critical line descent (“downward propagation”).

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