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| Citation: | Shi Donglei, Li Jian, Li Qihua, 2025. Convective and Environmental Characteristics of Tropical Cyclone Genesis-Rapid Intensification Compound Events in the Western North Pacific. Earth Science, 50(9): 3382-3394. doi: 10.3799/dqkx.2024.094
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As one of the main challenges in operational forecasting, clarifying the mechanisms behind tropical cyclone (TC) genesis, rapid intensification (RI), and their compound events (RIFG) is of great significance for disaster prevention and mitigation. Based on observational data, this study examines the convective and environmental characteristics of RIFG events and non-RI genesis events (NRIG) over the western North Pacific. On average, RIFG cases occur at lower latitudes compared to NRIG cases, and have stronger inner-core precipitation on the upshear left side. These cases are also associated with weaker vertical wind shear and background relative vorticity, higher inner-core relative vorticity, upper-level divergence, sea surface temperature, mid-level relative humidity, and surface latent heat flux. These favorable dynamic and thermodynamic conditions provide the basis for RIFG events. Further comparison between RIFG cases under weak vertical wind shear (W-VWS) and moderate-strong vertical wind shear (MS-VWS) shows that MS-VWS cases exhibit stronger and more asymmetric precipitation. Additionally, W-VWS (MS-VWS) cases experience more favorable environmental dynamic and thermodynamic conditions on the upshear and right-of-shear sides (downshear and left-of-shear sides), respectively.
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