资源环境科技发展态势分析平台

Intensification and dissipation of a hurricane before and after landfall, respectively, are crucial for coastal and inland risk potential. This study examines the relationship between intensity change prior to landfall and post-landfall dissipation. The relative difference of 24-h accumulated cyclone energy generated before and after landfall is defined as the landfall dissipation rate. This study focuses on the continental United States and shows that the 24-h hurricane landfall dissipation rate is significantly negatively related to the 24-h intensity change before landfall. This implies hurricanes undergoing rapid intensification before landfall weaken at a slower rate after landfall. The decay rate is also positively correlated with landfall intensity but is less certain for Category 4–5 hurricanes (>112 kt). The relationship between near-shore wind change and post-landfall decay is not equally distributed along the U.S. coast, with pre-landfall intensification more common along the Gulf Coast and a landfall dissipation rate that varies.