Frequency-specified EOF analysis and its application to Pacific decadal oscillation

Frequency-specified EOF analysis and its application to Pacific decadal oscillation
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频率指定的 EOF 分析及其在太平洋年代际振荡中的应用

DOI:
10.1007/s11430-016-0141-x
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发表时间:
2017-02
期刊:
Science China Earth Sciences
影响因子:
--
通讯作者:
Tang YouMin
Tang YouMin
中科院分区:
其他
文献类型:
--
作者:
Lian Tao;Tang YouMin

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本研究提出一种频率指定的经验正交函数(FSEOF)分析。FSEOF的目的是指定一个规定的频带的领先的主成分与较少的信息丢失在数据的末端,从而很好地表征感兴趣的信号。FSEOF可以很好地捕捉到主导模式的规定变化,并在解决频率相关的模式,特别是那些与低频振荡有内在的优点。对热带和北方太平洋海温场的应用表明,该方法能成功地分离出太平洋年代际振荡(PDO)模态和厄尔尼诺-南方振荡模态,并能清晰地探测出PDO在过去世纪的所有变化。
A frequency-specified empirical orthogonal function (FSEOF) analysis is proposed in this study. The aim of FSEOF is to specify a prescribed-band of frequency in leading principal components with less information losing at the ends of the data, thus well characterizing the signals of interest. The FSEOF can well capture prescribed variability in leading modes, and has intrinsic merits in resolving frequency-related modes, especially those associated with low frequency oscillations. An application of the FSEOF to the tropical and northern Pacific sea surface temperature shows that this new method can successfully separate Pacific decadal oscillation (PDO) mode from the El Niño-Southern oscillation mode, and clearly detect all regime shifts of PDO in the past century.
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