Dangerous turbulences were observed in the eyewall of category 5 Hurricane Hugo (1989) and the surface pressure associated with the turbulence was 8 hPa lower than the mean pressure in the eye. In this study, it is demonstrated that small scale, negative pressure perturbations in the tropical cyclone eyewall are associated with the tornado‐scale vortex (TSV) simulated with the large‐eddy simulation technique in a semi‐idealized numerical experiment. The negative pressure perturbation associated with TSVs is nonhydrostatic, dynamically resulting from the shearing effect. As a result, the negative pressure perturbation is linearly correlated with the vertical component of relative vorticity and maximum wind perturbation. Since the TSV is prevalent near the inner edge of the tropical cyclone eyewall, it is suggested that caution should be taken to estimate the central pressure of tropical cyclones with the extremely low pressure observed in the eyewall.

中文翻译：

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与热带气旋边界层中龙卷风尺度涡旋相关的负压扰动

在5类飓风雨果（1989）的眼壁中观察到危险的湍流，与湍流相关的表面压力比眼睛的平均压力低8 hPa。在这项研究中，证明了在半理想化数值实验中，热带气旋眼壁中的小尺度负压扰动与大涡模拟技术模拟的龙卷风尺度涡旋（TSV）有关。与TSV相关的负压扰动是非静液压的，这是剪切效应动态产生的。结果，负压扰动与相对涡度和最大风扰动的垂直分量线性相关。由于TSV普遍存在于热带气旋眼墙的内边缘附近，