台风"烟花"缓慢移动的机理研究:远距离双台风相互作用

本文通过一系列敏感性试验探究台风"烟花"移动缓慢的可能机理。结果表明:台风"烟花"的移动对台风"尼伯特"的强度较为敏感。"尼伯特"强度主要通过影响其附近大尺度低压系统的强度与范围,间接影响"烟花"的大尺度引导气流,进而影响"烟花"的移动。具体而言,"尼伯特"与其附近大尺度低压系统环流共同激发西北风引导气流,抵消了部分副高西南侧的东南风引导气流,从而造成"烟花"受到的大尺度引导气流偏弱,致使其移动缓慢,路径复杂。此外,当"尼伯特"强度越大时,以上过程对"烟花"移动的影响也越大。因此,当两个台风相距较远时,双台风相互作用可能通过影响周围的大尺度系统,间接对台风路径产生较大影响。

Numerical study on the mechanisms of slow-moving Typhoon "In-fa"(2106): interaction of binary typhoons with a far distance

This study employed a series of sensitivity experiments to investigate the potential mechanisms of the slow movement of Typhoon "In-fa". The findings show that the movement of Typhoon "In-fa" is influenced by the intensity of Typhoon "Nepartak". The intensity of "Nepartak" mainly affects the strength and range of the nearby large-scale low-pressure system, indirectly affecting the large-scale guiding airflow of "In-fa" and then affects its movement. In particular, the northwest wind-steering flow generated by "Nepartak" and low-pressure system partially neutralizes the southeast wind-steering flow on the southwest side of the subtropical high. This neutralization leads to the reduction in the large-scale steering flow of "In-fa", resulting in its slow movement and a complex track. Moreover, the study points out that the stronger "Nepartak" is, the greater its influences on movement of "In-fa" are. Results emphasize that interaction between distant typhoons can indirectly affect typhoon tracks by influencing the large-scale systems in its vicinity.