We investigated the relationship between tropical cyclones (TCs) and the Pacific Decadal Oscillation (PDO) over the western North Pacific (WNP) during 1982–2018, focusing on an area surrounding the Korean Peninsula and Japan. The frequency of TCs passing through this area (TC_m) in the negative PDO phase was approximately 50% higher than that in the positive phase in September. Higher TC track density was observed around the Korean Peninsula and Japan in the negative PDO phase because the large-scale environments were favorable for TC activity. However, TC_m and PDO were not related in August because the location of WNP subtropical high was not significantly different. In addition, large-scale environments, which were associated with TC activity, provided more favorable conditions in September than in August.

中文翻译：

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太平洋年代际振荡如何影响远东地区的热带气旋活动？

我们调查了 1982-2018 年间热带气旋 (TC) 与西北太平洋 (WNP) 上的太平洋年代际振荡 (PDO) 之间的关系，重点关注朝鲜半岛和日本周边地区。9 月份，在负 PDO 阶段通过该区域的 TC 频率（TC _m）比正阶段高出约 50%。由于大尺度环境有利于 TC 活动，在负 PDO 阶段在朝鲜半岛和日本周围观察到较高的 TC 轨迹密度。然而，TC_米与 8 月份的 PDO 无关，因为 WNP 副热带高压的位置没有显着差异。此外，与 TC 活动相关的大尺度环境在 9 月份提供了比 8 月份更有利的条件。