Climatological characteristics of the extratropical transition of tropical cyclones along different tracks in the western North Pacific(1979-2022)OA
Climatological characteristics of the extratropical transition of tropical cyclones along different tracks in the western North Pacific(1979-2022)
本研究基于国际气候管理最佳路径档案(IBTrACS)和欧洲中期天气预报中心第五代再分析数据集(ERA5),发现1979-2022年间西北太平洋有29％的热带气旋经历了温带变性(ET)过程,且ET事件的发生频率呈缓慢下降趋势.通过k-means聚类方法,将变性的热带气旋(ETCs)按路径特征划分为四类:转向路径ETCs,西移路径ETCs,西北移路径ETCs和异常路径ETCs.转向路径ETCs主要在完成转向后开始变性.西移路径ETCs大多数在登陆后完成变性(63.7％).异常路径ETCs通常在高纬度洋面完成变性.西北移路径ETCs在变性期间所用时间最长,移动速度较慢,因此影响持续时间较长.ET过程均发生在西太平洋副热带高压(WPSH)边缘,WPSH西伸时ET频率较高,东退时频率较低.除西移路径ETCs受地表摩擦主导外,其他类型多在WPSH西北侧的强斜压区完成转变.
Shanshan Li;Lei Chen;Xihui Gu
Department of Atmospheric Science,School of Environmental Studies,China University of Geosciences,Wuhan,ChinaDepartment of Atmospheric Science,School of Environmental Studies,China University of Geosciences,Wuhan,China||Department of Atmospheric Sciences,CMA-CUG Joint Centre for Severe Weather and Climate and Hydro-geological Hazards,China University of Geosciences,Wuhan,ChinaSchool of Geography and Information Engineering,China University of Geosciences,Wuhan,China
温带变性热带气旋西北太平洋变性特征
Extratropical transitionTropical cyclonesWestern North PacificTransition characteristics
《大气和海洋科学快报（英文版）》 2026 (2)
8-13,6
This work was supported by the National Key Research and Devel-opment Program of China[grant number 2023YFF0807000].
评论