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Tobias Kremer, Elmar Schömer, Christian Euler, and Michael Riemer

settings have been used for the parameterization schemes: inter alia a turbulent kinetic energy-based turbulence scheme, a shallow-convection scheme with mass-flux closure after Tiedtke (1989) , and a single-moment ice microphysics scheme (including graupel). The parameterization schemes are described in Doms et al. (2011) and more details on the setup of the simulation are given in Euler et al. (2019) . Our simulation domain spans from 22° to 54°N and from 40° to 70°W. Boundary and initial

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Christian Euler, Michael Riemer, Tobias Kremer, and Elmar Schömer

, and the translation of the TC into a thermodynamic environment that gradually becomes less favorable for tropical development, namely a drier and cooler environment, including decreasing sea surface temperature. The transition from a tropical to an extratropical cyclone is a highly asymmetric process with rapidly changing dynamics. The involved airstreams during ET can therefore be expected to be nontrivial variants of the airstreams of mature TCs and of the conveyor belts of extratropical

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Kevin Bachmann, Christian Keil, George C. Craig, Martin Weissmann, and Christian A. Welzbacher

microphysics scheme accounting for cloud water, rainwater, cloud ice, snow, and graupel ( Lin et al. 1983 ; Reinhardt and Seifert 2006 ); as well as a two-stream radiation scheme ( Ritter and Geleyn 1992 ). The asymptotic vertical mixing length of the boundary layer turbulence scheme is set to 500 m. All idealized experiments are initialized with horizontally homogeneous initial conditions (IC), based on a sounding from Payerne in Switzerland (CH, Radiosonde 06610; Fig. 1 ), observed at 1200 UTC 30 July

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