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Krzysztof Wargan and Lawrence Coy

data ( Homeyer et al. 2010 ). Given an enhanced planetary wave activity during SSW events, it is reasonable to ask whether anticyclonic wave breaking at the tropopause contributes to the increased observed in Figs. 1a , 2b , and 4 . We will argue that such a contribution exists but plays only a minor role. Figures 5a and 5b show the distribution of and relative vorticity at the tropopause between 75° and 86°N in two 2-week periods before and immediately after the SSW. The distributions

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