The dependence of numerically simulated cyclic mesocyclogenesis upon environmental vertical wind shear

Building upon the author's previous work that examined the dynamics of numerically simulated cyclic mesocyclogeneis and its dependence upon model physical and computational parameters, this study like-wise uses idealized numerical simulations to investigate associated dependencies upon ambient vertical wind shear. Specifically, the authors examine varations in hodograph shape, shear magnitude, and shear distribution, leading to storms with behaviour ranging from steady state to varying degrees of aperiodic occluding cyclic mesocyclogenesis. However, the authors also demonstrate that a different mode of non-occluding cyclic mesocyclogenesis may occur in certain environments. Straight hodographs (undirectional shear) produce only nonoccluding cyclic mesocyclogenesis. Introducing sone curvature by adding a quarter circle of turning at low levels results in steady, nonoccluding, and occluding modes. When a higher degree of curvature is introduced - for example, turning through half and three-quarter circle - the tendency for nonoccluding behaviour is diminished. None of the full-circle hodographs exhibited cycling during 4 h of simulation. Overall, within a given storm, the preferred mode of cycling is related principally to hodograph shape and magnitude of the ambient vertical shear.