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Nonlinear atmospheric variability in the winter northeast Pacific associated with the Madden-Julian oscillation Jamet, Cedric; Hsieh, William W.
Abstract
The Madden-Julian Oscillation (MJO), the primary mode of large-scale intraseasonal variability in the tropics, is known to relate to the mid-latitude atmospheric variability. Using neural network techniques, a nonlinear projection of the MJO onto the precipitation and 200-hPa wind anomalies in the northeast Pacific during January–March shows asymmetric atmospheric patterns associated with different phases of the MJO. For precipitation, the strength of the nonlinear effect to the linear effect was 0.94 (in terms of the squared anomalies and averaged over all phases of the MJO), indicating strong nonlinearity, while for the 200-hPa wind, the ratio was 0.55, indicating moderate nonlinearity. In general, anomalous winds blowing from the north or from land were associated with negative precipitation anomalies, while winds from the south or from the open ocean, with positive precipitation anomalies. The nonlinear effects generally induced positive precipitation anomalies during all phases of the MJO. An edited version of this paper was published by AGU. Copyright 2005 American Geophysical Union.
Item Metadata
Title |
Nonlinear atmospheric variability in the winter northeast Pacific associated with the Madden-Julian oscillation
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Creator | |
Publisher |
American Geophysical Union
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Date Issued |
2005-07-13
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Description |
The Madden-Julian Oscillation (MJO), the primary mode of large-scale intraseasonal variability in the tropics, is known to relate to the mid-latitude atmospheric variability. Using neural network techniques, a nonlinear projection of the MJO onto the precipitation and 200-hPa wind anomalies in the northeast Pacific during January–March shows asymmetric atmospheric patterns associated with different phases of the MJO. For precipitation, the strength of the nonlinear effect to the linear effect was 0.94 (in terms of the squared anomalies and averaged over all phases of the MJO), indicating strong nonlinearity, while for the 200-hPa wind, the ratio was 0.55, indicating moderate nonlinearity. In general, anomalous winds blowing from the north or from land were associated with negative precipitation anomalies, while winds from the south or from the open ocean, with positive precipitation anomalies. The nonlinear effects generally induced positive precipitation anomalies during all phases of the MJO. An edited version of this paper was published by AGU. Copyright 2005 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 |
10.14288/1.0041779
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URI | |
Affiliation | |
Citation |
Jamet, Cedric, Hsieh, William W. 2005. Nonlinear atmospheric variability in the winter northeast Pacific associated with the Madden-Julian oscillation, Geophysical Research Letters. 32 L13820
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Publisher DOI |
10.1029/2005GL023533
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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