Detecting and interpreting long-term changes in typhoon translation speed in observations remains challenging, contrasting with increased confidence in the poleward migration of typhoons. Here, I show a significant relationship between the basin-wide translation speed and the latitudinal position of tropical cyclones in the western North Pacific over 1980–2023. First, because tropical cyclones move faster at higher latitudes, the significant poleward migration (80 km/decade) increases the yearly basin-wide translation speed by 5% over the period. This effect reduces the detectability of a slowing trend. Second, the basin-wide translation speed solely contributed by regional translation speed has slowed by 18%, mostly in the late stage of the cyclone lifecycle. The translation speed slowdown and the poleward migration are likely caused by the same climate drivers through the interconnected large-scale atmospheric circulation between the tropics and subtropics. My findings suggest exacerbated tropical cyclone-related risk in the subtropical regions in a changing climate.

与台风向极地迁移的信心增加相比，在观测中检测和解释台风平移速度的长期变化仍然具有挑战性。在这里，我展示了 1980-2023 年西北太平洋热带气旋的全流域平移速度与纬度位置之间的显着关系。首先，由于热带气旋在高纬度地区移动速度更快，显着的向极地迁移（80公里/十年）使在此期间每年全流域的平移速度增加了5%。这种效应降低了放缓趋势的可检测性。其次，仅由区域平移速度贡献的流域范围内的平移速度已经减慢了18%，主要是在气旋生命周期的后期。平移速度减慢和向极地迁移可能是由相同的气候驱动因素通过热带和亚热带之间相互关联的大规模大气环流引起的。我的研究结果表明，在气候变化的情况下，亚热带地区与热带气旋相关的风险加剧。