874292.fig.004a
874292.fig.004b
874292.fig.004c
874292.fig.004d
Figure 4: Meridional gradient of Potential Vorticity (left) and Potential Vorticity (right) at 315-K isentropic surface for AEWs associated with cyclones (top) and for non-developing AEWs (AEWs not associated with cyclones (bottom)). Units are PVU for the PV and 0, 01 PVU/100 km for the meridional gradient of PV. 1PVU = 10−7 m2 K s−1 kg−1.