The Madden-Julian oscillation in an idealized general circulation model

Lau Ngar-Cheung Lau, I. M. Held, J. D. Neelin

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

The structure of the intraseasonal oscillations in the tropics of an idealized general circulation model with a zonally symmetric climate is described. Space-time spectra show a peak in zonal winds and velocity potential at the equator in zonal wavenumbers 1 and 2, corresponding to eastward-propagating power at phase speeds of ≃18m s-1. This speed is significantly greater than that of the observed oscillation but comparable to that obtained in similar models by Hayashi and Sumi and Swinbank et al. The corresponding eastward-propagating power in the precipitation spectrum is concentrated in wavenumbers 2-5. A simple Kelvin wave-CISK model, in which the vertical structure of the heating is taken from the composite, is shown to be capable of reproducing the phase speed simulated in the GCM. -from Authors

Original languageEnglish (US)
Pages (from-to)3810-3832
Number of pages23
JournalJournal of the Atmospheric Sciences
Volume45
Issue number24
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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