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Changes in the leading ENSO modes associated with the late 1970s climate shift: Role of surface zonal current An, Soon-Il; Ye, Zhengqing; Hsieh, William W.
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.
Item Metadata
Title |
Changes in the leading ENSO modes associated with the late 1970s climate shift: Role of surface zonal current
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Creator | |
Publisher |
American Geophysical Union
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Date Issued |
2006-07-22
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Description |
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.
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Genre | |
Type | |
Language |
eng
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Date Available |
2016-11-10
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0041773
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URI | |
Affiliation | |
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.
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Publisher DOI |
10.1029/2006GL026604
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty
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Copyright Holder |
Hsieh William W.
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International