Laterally forced equatorial perturbations in a linear model. Part II: mobile forcing

Zhang Chidong Zhang

Research output: Contribution to journalArticle

18 Scopus citations


An analytical solution of the model with a constant mean zonal flow reveals that amplitudes of forced waves can be significantly modulated by the mean zonal flow through its Doppler-shift effect on the forcing frequency. In general, amplitudes of westward-propagating waves, such as the Rossby and mixed Rossby-gravity waves, tend to be larger in mean westerlies than in mean easterlies for low-frequency forcing but smaller in mean westerlies for high-frequency forcing. The opposite dependence on the mean zonal flow applies to eastward-propagating waves, such as the Kelvin wave. The model numerical solutions show that the spatial structure of the laterally forced equatorial perturbation as a whole is sensitive to the mean zonal flow. -from Author

Original languageEnglish (US)
Pages (from-to)807-821
Number of pages15
JournalJournal of the Atmospheric Sciences
Issue number6
StatePublished - Jan 1 1993


ASJC Scopus subject areas

  • Atmospheric Science

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