The variations in the track and intensity of a tropical cyclone (TC) are closely correlated with the fine-scale evolution of its structure. The fine-scale track, intensity, and structural evolution of Typhoon Doksuri (2023) can be comprehensively analyzed by combining multi-source observations. The results herein show that Doksuri (2023) experienced secondary eyewall formation (SEF), concentric eyewall maintenance (CEM), and eyewall replacement cycle (ERC) processes when entering the South China Sea and prior to landfall. These processes can be further delineated into three subsequent stages. In the first stage, the SEF phase, the secondary (outer) eyewall formed, exhibiting features that were non-concentric with the inner eyewall. Concurrently, the track of Doksuri (2023) displayed notable oscillations in both its forward translational direction and speed, accompanied by the emergence of two radial maxima centers of wind speed. Subsequently, during the second stage, the CEM phase, the geometric centers of the inner and outer eyewalls of Doksuri (2023) coincided, initiating a rapid intensification process characterized by an accelerated forward translational speed. Both the inner and outer eyewalls further contracted during this phase. In the third stage, the ERC phase, the asymmetry of the inner eyewall increased, and the outer eyewall gradually contracted while the inner eyewall dissipated until the replacement was completed prior to landfall. Accordingly, Doksuri (2023) experienced rapid weakening. These findings have the potential to enhance our understanding of the physical mechanisms governing the intricate structures of TCs at fine scales, bolstering the forecast accuracy of TC tracks and intensities.

中文翻译：

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台风多克苏里（2023）同心眼壁观测细尺度演化特征


热带气旋（TC）的路径和强度的变化与其结构的精细尺度演化密切相关。结合多源观测，可以全面分析台风多克苏里（2023）的精细尺度路径、强度和结构演化。本文结果表明，Doksuri（2023）在进入南海时和登陆前经历了二次眼壁形成（SEF）、同心眼壁维护（CEM）和眼壁更换周期（ERC）过程。这些过程可以进一步划分为三个后续阶段。在第一阶段，即 SEF 阶段，形成了次级（外）眼壁，表现出与内眼壁非同心的特征。与此同时，Doksuri（2023）的轨迹在其向前平移方向和速度上都显示出显着的振荡，并伴随着两​​个风速径向极大中心的出现。随后，在第二阶段，即CEM阶段，Doksuri（2023）的内眼壁和外眼壁的几何中心重合，启动了以向前平移速度加快为特征的快速强化过程。在此阶段，内眼壁和外眼壁都进一步收缩。第三阶段，即ERC阶段，内眼壁的不对称性增加，外眼壁逐渐收缩，内眼壁消散，直到登陆前完成更换。因此，Doksuri (2023) 经历了快速减弱。这些发现有可能增强我们对精细尺度上控制热带气旋复杂结构的物理机制的理解，从而提高热带气旋路径和强度的预测准确性。