Systematic Variation of Summertime Tropical Cyclone Activity in the Western North Pacific in Relation to the Madden–Julian Oscillation
Systematic Variation of Summertime Tropical Cyclone Activity in the Western North Pacific in Relation to the Madden–Julian Oscillation
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DOI：
10.1175/2007jcli1493.1
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发表时间：
2008-03
影响因子：
4.9
通讯作者：
Joo‐Hong Kim;Chang‐Hoi Ho;Hyeong‐Seog Kim;C. Sui;S. Park
中科院分区：
文献类型：
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作者：
Joo‐Hong Kim;Chang‐Hoi Ho;Hyeong‐Seog Kim;C. Sui;S. Park
摘要根据1979-2004年夏季（6 - 9月）不同类型的麦登-朱利安涛动（MJO），研究了西北太平洋（WNP）热带气旋活动（即发生、路径和登陆）的变率。根据长波辐射数据的经验正交函数分析，确定了MJO的类别。当mjo相关对流中心位于WNP时，tc的数量增加。在与MJO东移和北移以及副热带高压的季节内变率相关的大尺度环境变化中，有利成因区的轴线系统地发生了跷跷板式的移动。此外，各MJO类型中TC径迹的密度在一阶上取决于主要成因区的系统移位。此外，这种转变还受到每个MJO类别中普遍存在的大规模转向流动的影响。当th……
Abstract The variability of observed tropical cyclone (TC) activity (i.e., genesis, track, and landfall) in the western North Pacific (WNP) is examined in relation to the various categories of the Madden–Julian oscillation (MJO) during summer (June–September) for the period 1979–2004. The MJO categories are defined based on the empirical orthogonal function analysis of outgoing longwave radiation data. The number of TCs increases when the MJO-related convection center is located in the WNP. The axis of a preferable genesis region systematically shifts like a seesaw in response to changes in the large-scale environments associated with both the eastward and northward propagation of the MJO and the intraseasonal variability of the WNP subtropical high. Furthermore, the authors show that the density of TC tracks in each MJO category depends on the systematic shift in the main genesis regions at first order. Also, the shift is affected by the prevailing large-scale steering flows in each MJO category. When th...