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Sonja Gisinger, Andreas Dörnbrack, Vivien Matthias, James D. Doyle, Stephen D. Eckermann, Benedikt Ehard, Lars Hoffmann, Bernd Kaifler, Christopher G. Kruse, and Markus Rapp

values in April–June (0.8, 0.5, and 0.2) to negative values in July–September (−0.2, −0.7, and −0.7), indicating an increasing tendency for southwesterly flows and blocking over New Zealand. The index of the southern annular mode (SAM) or Antarctic Oscillation (AAO) is calculated as the difference of the normalized zonal MSLP between 40° and 60°S ( Gong and Wang 1999 ). During JJA, the STJ and PFJ are two bands of strong westerlies that, climatologically, are located north and south of New Zealand at

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Benedikt Ehard, Peggy Achtert, Andreas Dörnbrack, Sonja Gisinger, Jörg Gumbel, Mikhail Khaplanov, Markus Rapp, and Johannes Wagner

guide to wavelet analysis . Bull. Amer. Meteor. Soc. , 79 , 61 – 78 , doi: 10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2 . Vadas , S. , J. Yue , and T. Nakamura , 2012 : Mesospheric concentric gravity waves generated by multiple convective storms over the North American Great Plain . J. Geophys. Res. , 117 , D07113 , doi: 10.1029/2011JD017025 . Vaisala , 2014 : Vaisala Radiosonde RS92-SGP. Accessed 20 October 2014. [Available online at http://www.vaisala.com/Vaisala%20Documents

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