Climatology of Tropical Cyclone Intensity Landfalling on Luzon Island and China

Abstract

Using the TC best path data and the ERA5 reanalysis data, the statistical characteristics and environmental conditions for three types of TCs landfalling on Luzon Island and China during 1949-2020 (72 years) are investigated in this work. According to the intensity change before and after landing on Luzon Island, it can be divided into three types of TCs: “Weakening” TCs (40.0 %), and “Unchanging” TCs (33.6 %), and “Enhancing” TCs (26.4 %). The “Weakening” TCs had similar landing frequency in summer and autumn, stronger strength, longer lifespan and most of that landfalled on China with the northwest or westward track. The “Enhancing” TCs and “Unchanging” TCs occurred mostly in summer, their track were most of the westward track. The “Enhancing” TCs had the weakest strength and the shortest lifespan. It is found that the weakening effect of topography of Luzon Island to the TCs was greater than the strengthening effect. The precipitation of “Weakening” TCs was much greater than that of the other two types of TCs. And lower SST, the “Ventilation Flow” effect caused by topography of Luzon Island and abated water vapor transport were not conducive to the development of “Weakening” TCs. On the contrary, the higher SST and more weaken central VWS of “Enhancing” TCs provides favorable thermal and dynamic conditions for their development, moreover water vapor transport strengthen provided favorable moisture conditions. Affected by the convergence of topography of Luzon Island arose in three types of TCs were the greatest precipitation during landing on Luzon Island.