Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model

doi:10.1007/s00382-017-3816-5

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model
	Wei, Yuntao 1,2,6,7; Liu, Fei 3,4; Mu, Mu 1,5; Ren, Hong-Li 6,7
刊名	CLIMATE DYNAMICS
	2018-05-01
卷号	50 期号:9-10 页码:3441-3456
关键词	MJO Air-sea interaction Positive-only heating Planetary-scale selection Coupled Kelvin-Rossby waves Warm Pool
ISSN号	0930-7575
DOI	10.1007/s00382-017-3816-5
通讯作者	Liu, Fei(liuf@nuist.edu.cn)
英文摘要	The authors present an air-sea coupled dynamic moisture (ASDM) model to explore the mechanism of preferred planetary scale of the Madden-Julian Oscillation (MJO). This ASDM model, extended from the original frictionally coupled dynamic moisture model and a mixed layer model, can present a good simulation of planetary-scale characteristics of the MJO, including a slow eastward propagation of 5 m s(-1), coupled Rossby-Kelvin wave-like structure, and phase leading of convective center by warm sea surface temperature (SST). It is interesting that the planetary-scale selection in terms of instability is only found in the nonlinear ASDM model with the assumption of positive-only heating. Such a scale selection, however, cannot be found in the ASDM model with linear heating or in an uncoupled atmosphere model. The essential mechanism for the scale selection is nonlinear positive-only heating, and the air-sea interaction primarily provides an instability source to support this scale selection. This scale selection is attributed to different phase speeds of coupled moist Rossby-Kelvin waves and dry Kelvin waves. From short-wave initial perturbations, the easterly wind anomalies of eastward-propagating dry Kelvin waves from a stronger wave component will catch up with other weaker moist components and suppress their westerly wind anomalies, resulting in weak SST gradient as well as reduced moisture convergence and precipitation for these suppressed components. As a result, the wavenumber-one structure is selected. The Warm Pool-like mean state will select the stronger component among the initial short-wave perturbations and accelerate this scale selection process. These results provide new insight into MJO mechanism in terms of air-sea interaction.
资助项目	China National 973 Project[2015CB453200] ; National Natural Scientific Foundation of China[41230420] ; NSFC Innovative Group Grant[41421005] ; IPOVAR Project[GASI-IPOVAI-01-02] ; IPOVAR Project[GASI-IPOVAI-02] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406401] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11010303] ; National Natural Science Foundation of China[41420104002] ; Natural Science Foundation of Jiangsu province[BK20150907]
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000429650700017
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/158701]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Liu, Fei
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing 210044, Jiangsu, Peoples R China 4.Nanjing Univ Informat Sci & Technol, Climate Dynam Res Ctr, Nanjing 210044, Jiangsu, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao 266237, Peoples R China 6.China Meteorol Adm, Natl Climate Ctr, Lab Climate Studies, Beijing 100081, Peoples R China 7.China Meteorol Adm, Natl Climate Ctr, CMA NJU Joint Lab Climate Predict Studies, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Wei, Yuntao,Liu, Fei,Mu, Mu,et al. Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model[J]. CLIMATE DYNAMICS,2018,50(9-10):3441-3456.
APA	Wei, Yuntao,Liu, Fei,Mu, Mu,&Ren, Hong-Li.(2018).Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model.CLIMATE DYNAMICS,50(9-10),3441-3456.
MLA	Wei, Yuntao,et al."Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model".CLIMATE DYNAMICS 50.9-10(2018):3441-3456.