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NICAM Simulates Development and Motion of Dominant Intraseasonal Tropical Weather Disturbance

NICAM Simulates Development and Motion of Dominant Intraseasonal Tropical Weather Disturbance. P. Liu, M. Satoh, B. Wang, H. Fudeyasu, T. Nasuno, T. Li, H. Miura, H. Taniguchi, H. Masunaga, X. Fu, and H. Annamalai, Mon. Wea. Rev., in press.

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NICAM Simulates Development and Motion of Dominant Intraseasonal Tropical Weather Disturbance

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  1. NICAM Simulates Development and Motion of Dominant Intraseasonal Tropical Weather Disturbance P. Liu, M. Satoh, B. Wang, H. Fudeyasu, T. Nasuno, T. Li, H. Miura, H. Taniguchi, H. Masunaga, X. Fu, and H. Annamalai, Mon. Wea. Rev., in press Vertical structure of the MJO during phase 2 along the equator: specific humidity (grey, contour interval), rain rate (red) RMM diagram of the MJO event: observed (blue) and simulated (red). The development and propagation of an active phase of the Madden-Julian Oscillation (MJO) was well simulated in a hindcast conducted with the Nonhydrosatic ICosahedral Atmospheric Model (NICAM), a global model that allows explicit representation of of cloud-systems. The model was initialized from December 15, 2006, observational analysis and integrated for a month. The amplitude and phase of the MJO in the simulations was characterized with multivariate MJO real-time (RMM) index, which uses outgoing longwave radiation as well as 200 hPa and 850 hPa wind fields. There is quite good agreement between the simulated and observed amplitude and phase progression (left) as well as vertical structure (right). This unprecedented success may be attributed to the explicit representation of both convection and the large-scale circulation.

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