Effects of zonal flows on equatorially trapped waves

Zhang Chidong Zhang, P. J. Webster

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Abstract

It is shown that changes in the wave structures due to the non-Doppler effect of the basic zonal flow are considerable for the Rossby wave, moderate for the westward propagating mixed Rossby-gravity wave, but negligible for the other equatorial waves. The Rossby wave and the westward propagating mixed Rossby-gravity wave possess greater eigenfrequencies and are less trapped in westerlies than in easterlies. It is suggested, that the equatorial transient Rossby waves interact with midlatitudes more readily at the longitudes associated with tropical westerlies. Furthermore, at these same longitudes, it is possible that extratropical forcing may project onto the equatorial modes and produce equatorially trapped responses if the forcing lies within their turning latitudes, which may extend to beyond 40° latitude at these locations. -from Authors

Original languageEnglish (US)
Pages (from-to)3632-3652
Number of pages21
JournalJournal of the Atmospheric Sciences
Volume46
Issue number24
StatePublished - Jan 1 1989

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ASJC Scopus subject areas

  • Atmospheric Science

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Chidong Zhang, Z., & Webster, P. J. (1989). Effects of zonal flows on equatorially trapped waves. Journal of the Atmospheric Sciences, 46(24), 3632-3652.