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Tessa R. Vance, Tas D. van Ommen, Mark A. J. Curran, Chris T. Plummer, and Andrew D. Moy

. The second and third EOFs of 500-mb GPH variability in the SH identify an atmospheric bridge, the Pacific and South American pattern (PSA) ( Mo and Paegle 2001 ). The PSA varies on an interannual basis but is on average the SH response to ENSO warm or cold events. During the austral winter prior to a mature El Niño (La Niña) event, a Rossby wave pattern of high–low–high (low–high–low) tropospheric pressure anomalies propagates from the CWEP through the South Pacific toward South America and the

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Ailie J. E. Gallant, Steven J. Phipps, David J. Karoly, A. Brett Mullan, and Andrew M. Lorrey

1. Introduction Climatic teleconnections describe dynamical links between the states of two remote atmosphere–ocean systems ( Liu and Alexander 2007 ). The processes defining teleconnections are numerous but include the propagation of atmospheric and/or oceanic wave trains, such as Kelvin or Rossby waves ( Gill 1980 ; Hoskins and Karoly 1981 ) and/or the mass movement of transient eddies such as weather systems ( Seager et al. 2005 ; Li and Wettstein 2012 ). This propagation induces remote

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