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

variability in the tropical Pacific during the last millennium (e.g., Newton et al. 2006 ; Sachs et al. 2009 ). Using multiple diverse and spatially distributed records from tree rings, ice cores, and corals increases the reliability of ENSO reconstructions ( Cobb et al. 2003 ; Braganza et al. 2009 ; Mann et al. 2009 ; McGregor et al. 2010 ). As understanding of low- to high-latitude Pacific Ocean teleconnections evolves, investigators are beginning to look to the data-scarce but potentially proxy

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