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Jannik Wilhelm, T. R. Akylas, Gergely Bölöni, Junhong Wei, Bruno Ribstein, Rupert Klein, and Ulrich Achatz

are capable of radiating larger-scale GWs. This possibility was first suggested by Bretherton (1969) for two-dimensional small-scale GW packets with isotropic scaling, and more recently has been investigated further by Van den Bremer and Sutherland (2014) for wave packets of various aspect ratios. The radiation of large-scale waves hinges on a resonance mechanism, wherein the vertical phase velocity of the emitted long waves matches the vertical group velocity of the small-scale wave packet

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

small (acoustic) time step, respectively. Thereby meteorologically significant low-frequency modes are integrated with the large RK3 time step, whereas high-frequency acoustic modes and gravity waves are integrated over smaller time steps to maintain numeric stability. In this study, a large time step of 15 s is used. Physical parameterizations used in this study contain the Rapid Radiative Transfer Model longwave scheme ( Mlawer et al. 1997 ), the Goddard shortwave scheme ( Chou and Suarez 1994

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