气候变化领域集成服务门户(CCPortal): Diversity of the madden-julian oscillation: Initiation region modulated by the interaction between the intraseasonal and interannual variabilities

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DOI	10.1175/JCLI-D-20-0688.1
	Diversity of the madden-julian oscillation: Initiation region modulated by the interaction between the intraseasonal and interannual variabilities
	TAKASUKA D.; SATOH M.
发表日期	2021
ISSN	08948755
起始页码	2297
结束页码	2318
卷号	34 期号:6
英文摘要	As one of the aspects of the diversity of the Madden-Julian oscillation (MJO), the modulation of initiation regions of the boreal-winter MJO is studied in terms of the relationship between intraseasonal and interannual variabilities. MJOs are categorized as those initiating in the Indian Ocean (IO), Maritime Continent (MC), and western Pacific (WP), referred to herein as IO-MJOs, MC-MJOs, and WP-MJOs, respectively. The composite analyses for each MJO category using observational data reveal that the diversity of MJO initiation regions directly results from the modulation of areas where horizontal advective premoistening efficiently occurs via intraseasonal/synoptic-scale winds. This is supported by the difference in the zonal location of equatorial intraseasonal circulations established before MJO initiation, which is related to a spatial change in background convection and associated Walker circulations forced by interannual sea surface temperature (SST) variability. Compared to IO-MJOs (favored in the climatological background on average), MC-MJOs tend to be realized under the eastern-Pacific El Niño-like condition, as a result of eastward-shifted intraseasonal convection and circulation patterns induced by background suppressed convection in the eastern MC. WP-MJOs are frequently initiated under the central-Pacific El Niño-like and positive IO dipole-like conditions, in which theWP is selectively moistened with the aid of background enhanced (suppressed) convection over the WP (the southeastern IO and the central-to-eastern Pacific). This major tendency derived from sample-limited observations is verified by a set of 15-yr numerical experiments with a global nonhydrostatic MJO-permitting model under a perpetual boreal-winter condition where observation-based SSTs are prescribed. © 2021 American Meteorological Society. All rights reserved.
英文关键词	Interannual variability; Madden-Julian oscillation
语种	英语
scopus关键词	Modulation; Nickel compounds; Oceanography; Surface waters; Circulation patterns; Interannual variability; Limited observations; Madden-Julian oscillation; Maritime Continent; Numerical experiments; Observational data; Sea surface temperature (SST); Climatology; advection; air-sea interaction; annual variation; convection; El Nino; Madden-Julian oscillation; sea surface temperature; seasonal variation; Walker circulation; Indian Ocean; Pacific Ocean; Pacific Ocean (West); Southeast Asia
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178681
作者单位	Department of Information Sciences, Ochanomizu University, Tokyo, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan
推荐引用方式 GB/T 7714	TAKASUKA D.,SATOH M.. Diversity of the madden-julian oscillation: Initiation region modulated by the interaction between the intraseasonal and interannual variabilities[J],2021,34(6).
APA	TAKASUKA D.,&SATOH M..(2021).Diversity of the madden-julian oscillation: Initiation region modulated by the interaction between the intraseasonal and interannual variabilities.Journal of Climate,34(6).
MLA	TAKASUKA D.,et al."Diversity of the madden-julian oscillation: Initiation region modulated by the interaction between the intraseasonal and interannual variabilities".Journal of Climate 34.6(2021).