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A Damping Effect of the Maritime Continent for the Madden-Julian Oscillation
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2019
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Source: Journal of Geophysical Research: Atmospheres, 2019; 124: 13693– 13713
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Journal Title:Journal of Geophysical Research: Atmospheres
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Description:The damping effect of the Maritime Continent (MC) on propagation of the Madden-Julian Oscillation (Madden-Julian oscillation) has been widely recognized; however, its underlying physics remains largely elusive. Capitalizing on the latest high-resolution reanalysis data (ERA-5) from the ECMWF, analyses in this study suggest that the interruption of lower-tropospheric moistening over the MC land during Madden-Julian oscillation eastward propagation is mainly due to a drying effect induced by zonal advection of the low-level winter mean moisture by Madden-Julian oscillation winds. The low-level mean moisture pattern over the MC tends to closely follow local topography, with moisture maxima collocated with local mountain peaks. Given this mean moisture distribution, the moisture advection by anomalous easterly Madden-Julian oscillation winds corresponding to the active Madden-Julian oscillation convection over the eastern Indian Ocean will lead to a drying (moistening) effect to the east (west) of the mountain peaks. Diagnosis based on hourly output from ERA-5 further illustrates that the diurnal cycle plays a crucial role for the formation of the topographically locked mean moisture pattern over the MC. This study, therefore, indicates that high-resolution models capable of resolving detailed topography and associated diurnal cycle over the MC could be necessary for realistic depiction of the interaction between the MC and Madden-Julian oscillation.
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Source:Journal of Geophysical Research: Atmospheres, 2019; 124: 13693– 13713
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