t 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 l...t 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 Nino-Southern oscillation mode, and clearly detect all regime shifts of PDO in the past century.展开更多
基金supported by the National Basic Research Program(Grant No.2013CB430302)the National Program on Global Change and Air-Sea Interaction(Grant Nos. GASI-IPOVAI-04 & GASI-IPOVAI-06)+2 种基金the National Natural Science Foundation of China(Grant Nos.41506025 & 41530961)the Project of State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography(Grant No.SOEDZZ1504)the project of Second Institute of Oceanography,SOA(Grant No.QNYC201501)
文摘t 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 Nino-Southern oscillation mode, and clearly detect all regime shifts of PDO in the past century.
