El Nino Onset Time Affects the Intensity of Landfalling Tropical Cyclones in China

In this work, we studied the influence of spring (SP) and summer (SU) El Nino events on the landfalling tropical cyclones (TCs) in China. The results showed that compared to SU El Nino years, the average latitude of the landfalling TCs in SP El Nino years shifted significantly southward and that the average TC intensity was significantly stronger, especially in the post-landfall period. Additionally, more severe tropical storm-level TCs generated over the South China Sea made landfall in China. Meanwhile, in SP El Nino years, landfalling TCs in southern China had a greater landfall intensity, but landfalling TCs in eastern China were the opposite. These changes in TC intensity during the SP El Nino years could be attributed to more favorable dynamical and thermodynamical conditions, which are beneficial for maintaining TC intensity and duration after landfall. These results could have important implications for an in-depth understanding of TC activities, as well as TC disaster prevention and mitigation.