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An MJO Simulated by the NICAM at 14- and 7-km Resolutions

PING LIU ; SATOH, Masaki ; ANNAMALAI, H ; BIN WANG ; FUDEYASU, Hironori ; NASUNO, Tomoe ; LI, Tim ; MIURA, Hiroaki ; TANIGUCHI, Hiroshi ; MASUNAGA, Hirohiko ; XIOUHUA FU

Monthly weather review, 2009-10, Vol.137 (10), p.3254-3268 [Periódico revisado por pares]

Boston, MA: American Meteorological Society

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Título:
An MJO Simulated by the NICAM at 14- and 7-km Resolutions
Autor: PING LIU ; SATOH, Masaki ; ANNAMALAI, H ; BIN WANG ; FUDEYASU, Hironori ; NASUNO, Tomoe ; LI, Tim ; MIURA, Hiroaki ; TANIGUCHI, Hiroshi ; MASUNAGA, Hirohiko ; XIOUHUA FU
Assuntos: Amplitude ; Amplitudes ; Anomalies ; Atmospheric models ; Boundary layer ; Climate ; Climatology ; Computer simulation ; Convection ; Convergence ; Data analysis ; Earth, ocean, space ; Easterlies ; Exact sciences and technology ; External geophysics ; General circulation models ; Geographical locations ; Height ; Humidity ; Indian Ocean ; Madden-Julian oscillation ; Marine ; Meteorology ; Moisture ; Moisture effects ; NICAM ; Oceanic convection ; Oceans ; Precipitation ; Propagation ; Simulation ; Tropical environments
É parte de: Monthly weather review, 2009-10, Vol.137 (10), p.3254-3268
Notas: ObjectType-Article-1
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Descrição: This study discloses detailed Madden-Julian oscillation (MJO) characteristics in the two 30-day integrations of the global cloud-system-resolving Nonhydrostatic Icosahedral Atmospheric Model (NICAM) using the all-season real-time multivariate MJO index of Wheeler and Hendon. The model anomaly is derived by excluding the observed climatology because the simulation is sufficiently realistic. Results show that the MJO has a realistic evolution in amplitude pattern, geographical locations, eastward propagation, and baroclinic- and westward-tilted structures. In the central Indian Ocean, convection develops with the low-level easterly wind anomaly then matures where the low-level easterly and westerly anomalies meet. Anomalous moisture tilts slightly with height. In contrast, over the western Pacific, the convection grows with a low-level westerly anomaly. Moisture fluctuations, leading convection in eastward propagation, tilt clearly westward with height. The frictional moisture convergence mechanism operates to maintain the MJO. Such success can be attributed to the explicit representation of the interactions between convection and large-scale circulations. The simulated event, however, grows faster in phases 2 and 3, and peaks with 30% higher amplitude than that observed, although the 7-km version shows slight improvement. The fast-growth phases are induced by the fast-growing low-level convergence in the Indian Ocean and the strongly biased ITCZ in the west Pacific when the model undergoes a spinup. The simulated OLR has a substantial bias in the tropics. Possible solutions to the deficiencies are discussed. [PUBLICATION ABSTRACT]
Editor: Boston, MA: American Meteorological Society
Idioma: Inglês

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An MJO Simulated by the NICAM at 14- and 7-km Resolutions

PING LIU ; SATOH, Masaki ; ANNAMALAI, H ; BIN WANG ; FUDEYASU, Hironori ; NASUNO, Tomoe ; LI, Tim ; MIURA, Hiroaki ; TANIGUCHI, Hiroshi ; MASUNAGA, Hirohiko ; XIOUHUA FU

Boston, MA: American Meteorological Society

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