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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

New Zealand as daily weather types. His classification is based on surface circulation patterns derived from a cluster analysis using the 40-yr (1958–97) NCEP–NCAR reanalysis dataset. Kidson’s weather types were often used in climate variability studies (e.g., Renwick 2011 and references therein). Here, we investigate the occurrence frequency of these patterns during JJA 2014 and relate them to the tropospheric forcing conditions and mountain wave activity during DEEPWAVE. The analysis is based

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Tanja C. Portele, Andreas Dörnbrack, Johannes S. Wagner, Sonja Gisinger, Benedikt Ehard, Pierre-Dominique Pautet, and Markus Rapp

extended wavelet transform and the calculation of significant parts of the cospectra are described in more detail in the appendix . 3. Meteorological evolution during IOP 9 The tropospheric flow during IOP 9 started as a so-called trough–northwest regime characterized by a low-level northwesterly flow (28–30 June 2014) and proceeded to a trough regime with more westerly low-level flow on 1 July 2014 (Table 1 and Fig. 2f in Gisinger et al. 2017 ). Figure 4 illustrates the eastward propagation of a

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