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DOI | 10.1175/JCLI-D-17-0003.1 |
Roles of the Moisture and Wave Feedbacks in Shaping the Madden-Julian Oscillation | |
Liu, Fei1,2; Wang, Bin3,4 | |
2017-12-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:24 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | This study investigates the moisture and wave feedbacks in the Madden-Julian oscillation (MJO) dynamics by applying the general three-way interaction theoretical model. The three-way interaction model can reproduce observed large-scale characteristics of the MJO in terms of horizontal quadrupole-vortex structure, vertically tilted structure led by planetary boundary layer (PBL) convergence, slow eastward propagation with a period of 30-90 days, and planetary-scale circulation. The moisture feedback effects can be identified in this model by using diagnostic thermodynamic and momentum equations, and the wave feedback effects are investigated by using a diagnostic moisture equation. The moisture feedback is found to be responsible for producing the MJO dispersive modes when the convective adjustment process is slow. The moisture feedback mainly acts to reduce the frequency and growth rate of the short waves, while leaving the planetary waves less affected, so neglecting the moisture feedback is a good approximation for the wavenumber-1 MJO. The wave feedback is shown to slow down the eastward propagation and increase the growth rate of the planetary waves. The wave feedback becomes weak when the convective adjustment time increases, so neglecting the wave feedback is a good approximation for the MJO dynamics during a slow adjustment process. Sensitivities of these two feedbacks to other parameters are also discussed. These theoretical findings suggest that the two feedback processes, and thus the behaviors of the simulated MJO mode, should be sensitive to the parameters used in cumulus parameterizations. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423492500027 |
WOS关键词 | VERTICAL STRUCTURE ; MJO ; MODES ; TEMPERATURE ; PROPAGATION ; CONVECTION ; DYNAMICS ; SCALE |
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/19787 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing, Jiangsu, Peoples R China; 2.Nanjing Univ Informat Sci & Technol, Climate Dynam Res Ctr, Nanjing, Jiangsu, Peoples R China; 3.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96822 USA; 4.Univ Hawaii Manoa, Atmosphere Ocean Res Ctr, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Liu, Fei,Wang, Bin. Roles of the Moisture and Wave Feedbacks in Shaping the Madden-Julian Oscillation[J]. JOURNAL OF CLIMATE,2017,30(24). |
APA | Liu, Fei,&Wang, Bin.(2017).Roles of the Moisture and Wave Feedbacks in Shaping the Madden-Julian Oscillation.JOURNAL OF CLIMATE,30(24). |
MLA | Liu, Fei,et al."Roles of the Moisture and Wave Feedbacks in Shaping the Madden-Julian Oscillation".JOURNAL OF CLIMATE 30.24(2017). |
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