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Michael Goss, Steven B. Feldstein, and Sukyoung Lee

Grant NA14OAR4310190. We thank three anonymous reviewers for their helpful comments, the European Centre for Medium-Range Weather Forecasts for providing us with the ERA-Interim data, and NOAA’s Climate Prediction Center for providing the Arctic Oscillation index. REFERENCES Baggett , C. , and S. Lee , 2015 : Arctic warming induced by tropically forced tapping of available potential energy and the role of the planetary-scale waves . J. Atmos. Sci. , 72 , 1562 – 1568 , doi: 10.1175/JAS-D-14

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Aaron B. Wilson, David H. Bromwich, and Keith M. Hines

the eastern Pacific SST anomalies during DJF (e.g., Ding et al. 2012 ; Lim et al. 2013 ), the focus in Fig. 4 is on the spring into early summer as the ENSO teleconnection has been demonstrated to be strongly correlated with the SAM during this season ( Fogt and Bromwich 2006 ) and reflects a transition from asymmetric to more zonal flow ( Karoly 1990 ). The European Centre for Medium-Range Weather Forecasts (ECMWF) interim reanalysis (ERA-Interim, hereafter ERAI; Dee et al. 2011 ) is used to

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