Frequency-specified EOF analysis and its application to Pacific decadal oscillation |
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| Authors: | Tao Lian YouMin Tang |
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| Affiliation: | 1.State Key Lab of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Hangzhou,China;2.Environmental Science and Engineering,University of Northern British Columbia,Prince George,Canada |
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| Abstract: | 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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