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Franziska Teubler and Michael Riemer

). While the diagnostic presented in the current study will not be formally related to wave-activity conservation laws, we hope that such a link can be established in future work. Eddy kinetic energy (EKE) and individual contributions to its tendency provide a well-established framework with which to analyze the evolution of RWPs (e.g., Orlanski and Sheldon 1995 ; Chang 2000 ; Chang et al. 2002 ). Within that framework, the paradigm of downstream baroclinic development has been established. Starting

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Michael Riemer, Marlene Baumgart, and Sven Eiermann

the recurving tropical cyclone (e.g., Riemer and Jones 2010 , section 5.2.2). It is therefore plausible to hypothesize that jet streaks downstream of ET play a particularly prominent role for cyclogenesis. The purpose of the current study is to test this hypothesis. To quantify the contributions of the upper-level trough and the jet streak to downstream cyclogenesis, the vertical motion attributable to these features will be analyzed. Section 2 recalls the relationship between vertical motion

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