The spatial-temporal patterns of tropical cyclone (TC) intensity changes caused by the warm ocean mesoscale eddy (WOME) distribution are evaluated using two sets of idealized numerical experiments. The results show that the TC was intensified and weakened when a WOME was close to and far away from the TC center, respectively. The area where the WOME enhanced (weakened) TC intensity is called the inner (outer) area in this study. Amplitudes of the enhancement and weakening caused by the WOME in the inner and outer area decreased and increased over time, while the ranges of the inner and outer area diminished and expanded, respectively. The WOME in the inner area strengthened the secondary circulation of the TC, increased heat fluxes, strengthened the symmetry, and weakened the outer spiral rainband, which enhanced TC intensity. The effect was opposite if the WOME was in the outer area, and it weakened the TC intensity. The idealized simulation employed a stationary TC, and thus the results may only be applied to TCs with slow propagation. These findings can improve our understanding of the interactions between TC and the WOME and are helpful for improving TC intensity forecasting by considering the effect of the WOME in the outer areas.

中文翻译：

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中尺度涡旋对热带气旋强度的影响

使用两组理想的数值实验评估了由温暖的海洋中尺度涡旋（WOME）分布引起的热带气旋（TC）强度变化的时空格局。结果表明，当WOME分别靠近和远离TC中心时，TC会增强和减弱。在本研究中，WOME增强（减弱）TC强度的区域称为内部（外部）区域。WOME在内部和外部区域引起的增强和减弱的幅度随时间减小和增加，而内部和外部区域的范围分别减小和扩展。内区的WOME加强了TC的二次循环，增加了热通量，增强了对称性，并减弱了外部螺旋雨带，从而增强了TC强度。如果WOME在外围，则效果相反，并且削弱了TC强度。理想化的仿真采用固定的TC，因此结果只能应用于传播较慢的TC。这些发现可以增进我们对TC和WOME之间相互作用的理解，并有助于通过考虑WOME在外围地区的影响来改善TC强度预报。