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Nonlinear multichannel singular spectrum analysis of the tropical Pacific climate variability using a neural network approach

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Title: Nonlinear multichannel singular spectrum analysis of the tropical Pacific climate variability using a neural network approach
Author: Hsieh, William W.; Wu, Aiming
Issue Date: 2002-07-18
Publicly Available in cIRcle 2011-03-23
Publisher American Geophysical Union
Citation: Hsieh, William W., Wu, Aiming. 2002. Nonlinear multichannel singular spectrum analysis of the tropical Pacific climate variability using a neural network approach. Journal of Geophysical Research Oceans. 107 C7 3076 dx.doi.org/10.1029/2001JC000957
Abstract: Singular spectrum analysis (SSA), a linear (univariate and multivariate) time series technique, performs principal component analysis (PCA) on an augmented data set containing the original data and time-lagged copies of the data. Neural network theory has meanwhile allowed PCA to be generalized to nonlinear PCA (NLPCA). In this paper, NLPCA is further extended to perform nonlinear SSA (NLSSA): First, SSA is applied to reduce the dimension of the data set; the leading principal components (PCs) of the SSA then become inputs to an NLPCA network (with a circular node at the bottleneck). This network performs the NLSSA by nonlinearly combining all the input SSA PCs. The NLSSA is applied to the tropical Pacific sea surface temperature anomaly (SSTA) field and to the sea level pressure anomaly (SLPA) field for the 1950–2000 period. Unlike SSA modes, which display warm and cool periods of similar duration and intensity, NLSSA mode 1 shows the warm periods to be shorter and more intense than the cool periods, as observed for the El Niño-Southern Oscillation. Also, in SSTA NLSSA mode 1 the peak warm event is centered in the eastern equatorial Pacific, while the peak cool event is located around the central equatorial Pacific, an asymmetry not found in the individual SSA modes. A quasi-triennial wave of about a 39 month period is found in NLSSA mode 2 of the SSTA and of the SLPA. An edited version of this paper was published by AGU. Copyright 2002 American Geophysical Union.
Affiliation: Earth and Ocean Sciences, Dept. of (EOS), Dept of
URI: http://hdl.handle.net/2429/32833
Peer Review Status: Reviewed
Scholarly Level: Faculty

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