The size of tropical cyclone (TC), defined as the radius of gale‐force (34‐kt) 10‐m winds (R34) from a TC centre, is often asymmetric but received limited attention. Understanding the asymmetry of TC size is particularly essential to enhance the applicability, predictability, and preparedness for the parties in the coastal regions. In this study, the ERA5 reanalysis data are first validated by the QuikSCAT satellite data. Results demonstrate that the radius of ERA5 32‐kt 10‐m winds estimates best R34 in the QuikSCAT satellite data with a promising linear relationship (r = .75). A 41‐year (1979–2019) homogeneous ERA5 global climatology of TC size asymmetry is hence established based on this linear regression model. Both the temporal and spatial characteristics of the TC size asymmetry are investigated and discussed. This study lays the important groundwork for future sophisticated research on TC size.
Understanding the responses of landfalling tropical cyclones to a changing climate has been a topic of great interest and research. Among them, the recently reported slowdown of tropical cyclone landfall decay in a warming climate engenders controversy. Here, the global climatology of landfall decay, based on the tropical cyclone best-track data available, reveals that the reported trends are uncertain and not universal, but spatial, temporal, data, and methodology dependent such that any claim of a climate trend could be misleading at present. The effective area of moisture supply from the ocean, most likely determined by the landfalling track modes, is demonstrated to be an important factor for the decay. This study provides timely essential clarifications of the current contentious understanding.
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