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- W3004065720 abstract "ABSTRACT The eastward propagating Madden–Julian oscillation (MJO) events exhibit various speeds ranging from 1 to 9 m s −1 , but what controls the propagation speed remains elusive. This study attempts to address this issue. It reveals that the Kelvin wave response (KWR) induced by the MJO convection is a major circulation factor controlling the observed propagation speed of the MJO, with a stronger KWR corresponding to faster eastward propagation. A stronger KWR can accelerate the MJO eastward propagation by enhancing the low-level premoistening and preconditioning to the east of the MJO deep convection. The strength of the KWR is affected by the background sea surface temperature (SST). When the equatorial central Pacific SST warms, the zonal scale of the Indo-Pacific warm pool expands, which increases the zonal scale of the MJO, favoring enhancing the KWR. This effect of warm-pool zonal scale has been verified by idealized experiments using a theoretical model. The findings here shed light on the propagation mechanism of the MJO and provide a set of potential predictors for forecasting the MJO propagation." @default.
- W3004065720 created "2020-02-07" @default.
- W3004065720 creator A5038170378 @default.
- W3004065720 creator A5058543086 @default.
- W3004065720 date "2020-04-15" @default.
- W3004065720 modified "2023-10-16" @default.
- W3004065720 title "Circulation Factors Determining the Propagation Speed of the Madden–Julian Oscillation" @default.
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- W3004065720 doi "https://doi.org/10.1175/jcli-d-19-0661.1" @default.
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