A New Detection Scheme of Wave-Breaking Events with Blocking Flow Configurations

Abstract Blocking flow configurations, which tend to accompany strong circulation anomalies and therefore can cause extreme weather conditions, have recently been studied in relation large-scale wave breaking (WB). Although WB events detected often from an instantaneous morphology perspective, the present study proposes a new approach for detection wave-activity perspective focusing on its accumulation, saturation, release. This evolution of activity is theoretically equivalent anomalous potential vorticity (PV) flux with sign changing negative positive, utilized this detect that high-amplitude height blocking configurations. As previous studies, given event classified into high pressure type or low depending upon primary PV anomaly center further eastward westward longitudinal movement center. The method applied wintertime Northern Hemisphere shows anticyclone likely eastward-moving center, occurring mostly under anticyclonic westerly shear. By contrast, cyclonic accompanies Composite analysis confirms consistency between sign-changing convergence/divergence quasi-stationary Rossby trains around region.