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首页> 外文期刊>Theoretical and applied climatology >Multi-scale variation of the meridional movement of the western Pacific warm pool and its associated large-scale climate features
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Multi-scale variation of the meridional movement of the western Pacific warm pool and its associated large-scale climate features

机译：西太平洋暖池子午运动的多尺度变化及其相关的大尺度气候特征

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摘要

In this study, we investigated variation of the meridional movement of the western Pacific warm pool (WPWP). The variation was measured by the central latitude (Clat) of the WPWP on various time scales. Its relationships with global sea surface temperature (SST), precipitation, and atmospheric circulation were examined by applying several advanced statistical methods. First, the techniques of wavelet analysis and least-square adjustment were used to depict the time-frequency features and the mean dominant oscillating time scales of the Clat. Then, a multi-stage filtering technique was applied to illustrate the related dominant oscillating signals. We also examined the time-frequency characteristics of the relationships between Clat and the leading modes of the Indo-Pacific oceans by employing a cross-covariance function analysis and a multiple moving-window method. The physical mechanisms for the relationships between Clat and the patterns of SST, precipitation, and atmospheric circulation were discussed. Results indicated that there is a weakening trend in the oscillation of Clat mainly because the quasi-annual oscillation of Clat increases in January-March and decreases in July-September. The semi-annual oscillation of Clat closely interacts with the westerly wind over the summer hemisphere of the tropical western Pacific Ocean and with the easterly wind over the winter hemisphere of the ocean. The interannual component of Clat corresponds to El Nio-Southern Oscillation and the Indian Ocean basin-wide warming or cooling with strengthened oscillations in the 1970s, and the lower-frequency component of Clat closely corresponds to the central Pacific type of El Nio from the 1990s.
机译：在这项研究中，我们调查了西太平洋暖池（WPWP）的子午运动的变化。通过WPWP在不同时标上的中心纬度（Clat）来测量变化。通过应用几种先进的统计方法，研究了其与全球海表温度（SST），降水和大气环流的关系。首先，利用小波分析和最小二乘平差技术描述了Clat的时频特征和平均主导振荡时标。然后，采用多级滤波技术来说明相关的主振荡信号。我们还使用跨协方差函数分析和多重移动窗口方法研究了克拉与印度太平洋太平洋主导模式之间关系的时频特征。讨论了Clat与SST模式，降水和大气环流之间关系的物理机制。结果表明，Clat振荡趋势减弱，主要是因为Clat的准年振荡在1月至3月增加而在7月至9月减少。 Clat的半年振荡与热带西太平洋夏季半球的西风和海洋冬季半球的东风紧密相互作用。 Clat的年际分量对应于1970年代厄尔尼诺-南方涛动和印度洋流域范围内的变暖或变冷，且振荡加剧，Clat的低频分量与1990年代的太平洋中心类型密切对应。 。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|859-872|共14页
  • 作者

    Zhou Guojun; Yang Song; Zheng Dawei;

  • 作者单位

    Sun Yat Sen Univ, Sch Atmospher Sci, 135 West Xingang Rd, Guangzhou 510275, Guangdong, Peoples R China|Sun Yat Sen Univ, Inst Earth Climate & Environm Syst, Guangzhou, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Atmospher Sci, 135 West Xingang Rd, Guangzhou 510275, Guangdong, Peoples R China|Sun Yat Sen Univ, Inst Earth Climate & Environm Syst, Guangzhou, Guangdong, Peoples R China;

    Chinese Acad Sci, Ctr Astrogeodynam Res, Shanghai Astron Observ, Shanghai, Peoples R China;

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