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- W2896749220 abstract "Abstract Upper-tropospheric Rossby wave packets (RWPs) are important dynamical features, because they are often associated with weather systems and sometimes act as precursors to high-impact weather. The present work introduces a novel diagnostic to identify RWPs and to quantify their amplitude. It is based on the local finite-amplitude wave activity (LWA) of Huang and Nakamura, which is generalized to the primitive equations in isentropic coordinates. The new diagnostic is applied to a specific episode containing large-amplitude RWPs and compared with a more traditional diagnostic based on the envelope of the meridional wind. In this case, LWA provides a more coherent picture of the RWPs and their zonal propagation. This difference in performance is demonstrated more explicitly in the framework of an idealized barotropic model simulation, where LWA is able to follow an RWP into its fully nonlinear stage, including cutoff formation and wave breaking, while the envelope diagnostic yields reduced amplitudes in such situations." @default.
- W2896749220 created "2018-10-26" @default.
- W2896749220 creator A5032017067 @default.
- W2896749220 creator A5069077236 @default.
- W2896749220 creator A5069281349 @default.
- W2896749220 date "2018-11-14" @default.
- W2896749220 modified "2023-10-03" @default.
- W2896749220 title "Local Finite-Amplitude Wave Activity as a Diagnostic for Rossby Wave Packets" @default.
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- W2896749220 doi "https://doi.org/10.1175/mwr-d-18-0068.1" @default.
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