Articles | Volume 21, issue 6
Research article
26 Mar 2021
Research article |  | 26 Mar 2021

Sensitivities of the Madden–Julian oscillation forecasts to configurations of physics in the ECMWF global model

Jun-Ichi Yano and Nils P. Wedi

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Cited articles

Chang, C. P.: Viscous internal gravity waves and low-frequency oscillations in the tropics, J. Atmos. Sci., 34, 901–910, 1977. 
Crueger, T. and Stevens, B.: The effect of atmospheric radiative heating by clouds on the Madden–Julian Oscillation, J. Adv. Model. Earth Sy., 7, 854–864,, 2015. 
ECMWF: OpenIFS CY43R3 release notes, available at: (last access: 25 March 2021), 2020. 
Emanuel, K. A.: An air–sea interaction model of intraseasonal oscillations in the tropics, J. Atmos. Sci., 44, 2324–2340, 1987. 
Fuchs, Ž. and Raymond, D. J.: A simple model of intraseasonal oscillations, J. Adv. Model. Earth Sy., 9, 1195–1211,, 2017. 
Short summary
Sensitivities of forecasts of the Madden–Julian oscillation (MJO) to various different configurations of the physics are examined with the global model of ECMWF's Integrated Forecasting System (IFS). The motivation for the study was to simulate the MJO as a nonlinear free wave. To emulate free dynamics in the IFS, various momentum dissipation terms (friction) as well as diabatic heating were selectively turned off over the tropics for the range of the latitudes from 20° S to 20° N.
Final-revised paper