TY - JOUR
T1 - The Madden-Julian oscillation in an idealized general circulation model
AU - Ngar-Cheung Lau, Lau
AU - Held, I. M.
AU - Neelin, J. D.
PY - 1988
Y1 - 1988
N2 - 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
AB - 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
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U2 - 10.1175/1520-0469(1988)045<3810:tmjoia>2.0.co;2
DO - 10.1175/1520-0469(1988)045<3810:tmjoia>2.0.co;2
M3 - Article
AN - SCOPUS:0024193177
SN - 0022-4928
VL - 45
SP - 3810
EP - 3832
JO - Journal of the Atmospheric Sciences
JF - Journal of the Atmospheric Sciences
IS - 24
ER -