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DOI | 10.1007/s00382-017-3816-5 |
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 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:3441-3456 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
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. |
英文关键词 | MJO Air-sea interaction Positive-only heating Planetary-scale selection Coupled Kelvin-Rossby waves Warm Pool |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429650700017 |
WOS关键词 | GENERAL-CIRCULATION MODEL ; INTRASEASONAL OSCILLATIONS ; SURFACE TEMPERATURE ; INDIAN-OCEAN ; EASTWARD PROPAGATION ; TROPICAL CIRCULATION ; EQUATORIAL WAVES ; SKELETON MODEL ; PACIFIC-OCEAN ; ROSSBY WAVES |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35612 |
专题 | 气候变化 |
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,2018,50:3441-3456. |
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,50,3441-3456. |
MLA | Wei, Yuntao,et al."Planetary scale selection of the Madden-Julian Oscillation in an air-sea coupled dynamic moisture model".CLIMATE DYNAMICS 50(2018):3441-3456. |
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