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Quasi-decadal spectral peaks of tropical Western Pacific SSTs as a precursor for tropical cyclone threat

机译:热带西太平洋海表温度的准年代际光谱峰,是热带气旋威胁的先兆

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摘要

A recent study identified significant spectral peaks in sea surface temperatures (SSTs) at quasi‐decadal frequency bands, which were unique to the tropical western Pacific (TWP). Using the multitaper method for spectral and coherence analysis, this study finds that the TWP SSTs at these quasi‐decadal time scales are coherent with western Pacific tropical cyclone threat [as measured by the power dissipation index (PDI)], but that the PDI lags TWP SSTs by about two years. Thus, the quasi‐decadal peaks in TWP SSTs may be a precursor for enhanced tropical cyclone threat two years later. Composite analyses are shown to illustrate how areal tropical cyclone frequencies and relevant atmospheric fields evolve following the quasidecadal peaks in TWP SSTs. The fields during peak PDI years strongly resemble those observed during El Niño events.
机译:最近的一项研究发现,在准年代际频带的海表温度(SST)中有明显的光谱峰,这是热带西太平洋(TWP)所独有的。使用多锥方法进行频谱和相干分析,本研究发现,在这些准年代际尺度上的TWP SST与西太平洋热带气旋威胁[通过功率耗散指数(PDI)衡量]相干,但PDI滞后TWP SST延长约两年。因此,TWP SST的准年代际峰值可能是两年后热带气旋威胁加剧的先兆。进行了综合分析,以说明热带气旋的频率和相关大气场是如何随着TWP SST中的准侧面峰而演化的。 PDI高峰期的场强与厄尔尼诺事件期间观测到的强力场相似。

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