两种类型的ENSO对影响韩国的热带气旋轨道的影响:基于集群的方法
Han-Kyoung Kim1, Jong-Yeon Park1,2, Jung-Eun Chu3
1Department of Earth and Environmental Sciences & Earth Environmental System Research Center, Jeonbuk National University.
iScience
|December 9, 2025
概括
不同的厄尔尼诺-南方振荡 (ENSO) 类型影响南韩附近的热带气旋 (TC) 轨迹. 东太平洋的拉尼娜现象促进了菲律宾海的TC,而中太平洋的厄尔尼诺现象则有利于来自西南北太平洋的反复出现的TC.
科学领域:
- 大气科学 大气科学
- 海洋学 海洋学 海洋学
- 气象学 天气学
背景情况:
- 厄尔尼诺-南方振荡 (ENSO) 对西北太平洋 (WNP) 热带气旋 (TC) 活动的影响得到了充分研究,但其对影响韩国TC轨道的具体影响尚不清楚.
- 了解这些影响对于改善区域TC预测和防灾准备至关重要.
研究的目的:
- 研究和区分各种ENSO类型对影响韩国热带气旋轨道的影响.
- 识别与不同ENSO阶段相关的独特动态机制,调节该地区的TC行为.
主要方法:
- 利用自组织地图 (SOM) 将影响韩国紧急区域的热带气旋轨迹分类为两个不同的集群 (C1和C2).
- 分析了与东太平洋拉尼娜和中太平洋厄尔尼诺事件相关的大气循环模式和风异常,以解释观察到的TC轨道变化.
主要成果:
- 集群1 (C1) TCs在菲律宾海形成并向北移动,由于南风异常,在东太平洋La Niña事件期间的频率增加.
- 集群2 (C2) TCs起源于东南WNP,具有反复的轨道,在中太平洋厄尔尼诺事件期间表现出更高的频率,与旋风循环异常和亚热带高位移有关.
- 确定了不同的ENSO远程连接,影响TC起源位置和轨道特征.
结论:
- 不同的ENSO类型通过特定的动态过程对影响韩国的TC轨道产生不同的影响.
- 这些发现增强了对WNP中ENSO-TC关系的理解,为影响朝鲜半岛的TC提供了更好的可预测性.
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