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Changes in the leading ENSO modes associated with the late 1970s climate shift: Role of surface zonal current

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Title: Changes in the leading ENSO modes associated with the late 1970s climate shift: Role of surface zonal current
Author: An, Soon-Il; Ye, Zhengqing; Hsieh, William W.
Issue Date: 2006-07-22
Publicly Available in cIRcle 2011-03-23
Publisher American Geophysical Union
Citation: An, Soon-Il, Ye, Zhengqing, Hsieh, William W. 2006. Changes in the leading ENSO modes associated with the late 1970s climate shift: Role of surface zonal current. Geophysical Research Letters. 33 L14609. dx.doi.org/10.1029/2006GL026604
Abstract: In this study, using the nonlinear principal analysis (NLPCA) technique, we demonstrated that the leading El Nino-Southern Oscillation (ENSO) mode in a physical basis changed since the late 1970s. The ENSO mode during the pre-1980s resembles the destabilized ‘ocean basin mode’, while during the post-1980s does ‘the recharge-mode’. In particular, for the pre-1980s, the surface zonal current mainly acts as an intensifier of the ENSO, while that during post-1980s it plays a role in the transition of the ENSO cycle. The NLPCA results are reconfirmed by the eigen analysis of the linearized intermediated ENSO model. Over a reasonable parameter range, the leading eigen modes associated with the pre-1980s are completely separable from those associated with the post-1980s. The eigen structures for each decadal-period resemble the corresponding NLPCA patterns. An edited version of this paper was published by AGU. Copyright 2006 American Geophysical Union.
Affiliation: Earth and Ocean Sciences, Dept. of (EOS), Dept of
URI: http://hdl.handle.net/2429/32795
Peer Review Status: Reviewed
Scholarly Level: Faculty

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