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• W3042243875 abstract "The variability of the zonal-mean large-scale extratropical circulation is often studied using individual modes obtained from empirical orthogonal function (EOF) analyses. The prevailing reduced-order model of the leading EOF (EOF1) of zonal-mean zonal wind, called the annular mode, consists of an eddy-mean flow interaction mechanism that results in a positive feedback of EOF1 onto itself. However, a few studies have pointed out that under some circumstances in observations and GCMs, strong couplings exist between EOF1 and EOF2 at some lag times, resulting in decaying-oscillatory, or propagating, annular modes. Here, we introduce a reduced-order model for coupled EOF1 and EOF2 that accounts for potential cross-EOF eddy-zonal flow feedbacks. Using the analytical solution of this model, we derive conditions for the existence of the propagating regime based on the feedback strengths. Using this model, and idealized GCMs and stochastic prototypes, we show that cross-EOF feedbacks play an important role in controlling the persistence of the annular modes by setting the frequency of the oscillation. We find that stronger cross-EOF feedbacks lead to less persistent annular modes. Applying the coupled-EOF model to the Southern Hemisphere reanalysis data shows the existence of strong cross-EOF feedbacks. The results highlight the importance of considering the coupling of EOFs and cross-EOF feedbacks to fully understand the natural and forced variability of the zonal-mean large-scale circulation." @default.
• W3042243875 created "2020-07-23" @default.
• W3042243875 creator A5037500781 @default.
• W3042243875 creator A5052673105 @default.
• W3042243875 date "2021-01-01" @default.
• W3042243875 modified "2023-10-14" @default.
• W3042243875 title "An Eddy–Zonal Flow Feedback Model for Propagating Annular Modes" @default.
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• W3042243875 doi "https://doi.org/10.1175/jas-d-20-0214.1" @default.
• W3042243875 hasPublicationYear "2021" @default.
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