Subsequent tropical cyclogenesis in the South China Sea induced by the pre-existing tropical cyclone over the western North Pacific: a case study

Mechanisms of tropical cyclogenesis have been studied for decades. A new one in the South China Sea, namely, PTC-STC is proposed. subsequent cyclone (STC) Sea can be induced by a pre-existing (PTC) over western North Pacific. The observations, reanalysis, and numerical sensitivity experiments suggest that terrain Philippines (especially Luzon) geographically essential to development STC, whereas intensity track PTC are conditionally decisive. If replaced sea, no STC forms. steep mountain range Luzon provides static blocking effect 1) enhance upward motion; 2) accumulate warm moist air mass from westerly PTC; 3) constrain advection vorticity PTC. Meanwhile, northeasterly climbs terrains, increases diabatic heating, warms proximity leeside mountains. These processes show interactions between could provide favorable dynamic thermodynamic conditions low-to-mid troposphere Sea. Whereas, if too strong, it move into suppressing standalone