The Different Characteristics of the Mass Transport between the Stratosphere and the Troposphere in Two Types of Cyclonic Rossby Wave-Breaking Events

Using the ERA5 reanalysis data and trajectory analysis provided by Hysplit4, a comparative was conducted on primary pathways of air particles dominant weather systems in two distinct cases equatorward poleward cyclonic Rossby wave-breaking (CWB) events. Subsequently, characteristics mass exchange between stratosphere troposphere both CWBs were estimated discussed. CWB events are frequently associated with development an upper front subtropics ridge or blocking mid-latitudes, leading to tropopause anomaly characterized downward depression upward bulge mid-latitudes. High potential vorticity (PV) exhibit negligible vertical motion instead controlled circulation blocking, significant transport. In contrast, low PV display noticeable motion, approximately one fourth them ascending north side upper-level jet exit region. After occurrence, 25% moved southward sank below 500 hPa downstream trough’s cold air. Most high remained stratosphere, predominantly troposphere. Only small proportion (2% 6%) underwent stratosphere–troposphere (STE). CWB, STE manifested as transport from troposphere, occurring mainly 24–48 h post breaking maximum 1.54 × 1013 kg. involved within 0–18 1.48