This study revisits the nonlinear relationship between tropical cyclone (TC) size and intensity over the western North Pacific (WNP). Using best track data from the Japan Meteorological Agency from 2007–2019, we find that the statistical turning point on a fitted size‐intensity curve only exists for TCs with greater lifetime peak intensities (e.g., typhoons). The track and evolution type are two factors determining the statistical size‐intensity relationship. The nonlinear size‐intensity relationship is only observed for recurving typhoons reaching their peak intensities and sizes at different times, due to a nonmonotonic size change during the weakening stage. The slight size decrease in the initial weakening stage can be linked to a TC weakening‐induced shrinkage balanced by a baroclinic expansion when recurving typhoons move into higher latitudes. Finally, different evolution types for WNP typhoons can be determined by the ratio of intensity/size to its theoretical maximum.

中文翻译：

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回顾北太平洋西部热带气旋大小与强度之间的关系

这项研究重新探讨了热带气旋（TC）大小与北太平洋西部（WNP）强度之间的非线性关系。使用日本气象厅2007-2019年的最佳跟踪数据，我们发现，拟合的大小强度曲线上的统计转折点仅存在于生命周期峰值强度较大的台风（例如台风）中。径迹和演变类型是决定统计大小强度关系的两个因素。由于在弱化阶段非单调的尺寸变化，仅在反曲台风在不同时间达到其峰值强度和尺寸时才观察到非线性尺寸-强度关系。当逆风台风移向较高纬度时，初期减弱阶段的略微减小可能与TC减弱引起的收缩与斜压膨胀平衡有关。最后，可以通过强度/大小与其理论最大值的比值来确定WNP台风的不同演化类型。