Download presentation
Presentation is loading. Please wait.
1
Large Scale Rossby waves amplifying and breaking as they approach weak ambient flow in the subtropics Potential Vorticity (PV) @ 350K
2
Latitudinal PV gradient: restoring mechanism for Rossby waves - waveguide Red=isentropic sfc Black=iso-PV sfc Blue=zonal wind speed PV @ 350K
3
INTERANNUAL VARIABILITY EL NINO LA NINA
4
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
1.Poleward reflection near breaking level drives waves toward high- latitudes 2.Wave convergence decelerates mean flow; critical line established 3.Further vertical wave propagation is effectively trapped below critical line. 4.Waves converge onto progressively lower levels of the atmosphere, critical line descent (“downward propagation”). Wave Propagation Wave-mean flow interaction Latitude EP flux convergence mean flow deceleration Critical line Dynamical Mechanism
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.