Abstract
Considering the influence of the upper‐boundary on wave breaking in a Boussinesq environment, we compare ultra‐high resolution numerical simulations of a topographically forced polar stratospheric vortex using: 1) a rigid upper‐boundary condition (following Dritschel and Saravanan, 1994) and 2) a vertical sponge (preventing spurious reflection of upward propagating waves). In 1) both local (to the forcing) and remote breaking is evidenced for weak forcing while only local breaking is observed for sufficiently strong forcing. In 2) remote breaking is absent and local breaking, which occurs for sufficiently strong forcing, has quite a different character to that seen in 1). Compressibility effects are also discussed.
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