IOCAS-IR  > 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, Yuntao1,2,6,7; Liu, Fei3,4; Mu, Mu1,5; Ren, Hong-Li6,7
2018-05-01
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Volume50Issue:9-10Pages:3441-3456
Corresponding AuthorLiu, Fei(liuf@nuist.edu.cn)
AbstractThe 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.
KeywordMJO Air-sea interaction Positive-only heating Planetary-scale selection Coupled Kelvin-Rossby waves Warm Pool
DOI10.1007/s00382-017-3816-5
Indexed BySCI
Language英语
Funding ProjectChina 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 Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000429650700017
PublisherSPRINGER
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/158702
Collection海洋环流与波动重点实验室
Corresponding AuthorLiu, Fei
Affiliation1.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
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
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