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DOI | 10.1007/s00382-016-3090-y |
Effects of moisture feedback in a frictional coupled Kelvin-Rossby wave model and implication in the Madden-Julian oscillation dynamics | |
Liu, Fei1,2; Wang, Bin3 | |
2017 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 48 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | The authors extend the original frictional wave dynamics and implement the moisture feedback (MF) to explore the effects of planetary boundary layer (PBL) process and the MF on the Madden-Julian Oscillation (MJO). This new system develops the original frictional wave dynamics by including the moisture tendency term (or the MF mode), along with a parameterized precipitation based on the Betts-Miller scheme. The linear instability analysis of this model provides solutions to elucidate the behaviors of the "pure" frictional convergence (FC) mode and the "pure" MF mode, respectively, as well as the behaviors of the combined FC-MF mode or the dynamical moisture mode. These results show that without the PBL frictional moisture convergence, the MF mode is nearly stationary and damped. Not only does the PBL frictional feedback make the damping MF mode grow with preferred planetary scale but it also enables the nearly stationary MF mode to move eastward slowly, resulting in an oscillation with a period of 30-90 days. This finding suggests the important role of the frictional feedback in generating eastward propagating unstable modes and selecting the preferred planetary scales. The MF process slows down the eastward-propagating short-wave FC mode by delaying the occurrence of deep convection and by enhancing the Rossby wave component. However, the longest wave (wavenumber one) is insensitive to the MF or the convective adjustment time, indicating that the unstable longest wave is primarily controlled by PBL frictional feedback process. Implications of these theoretical results in MJO simulation in general circulation models are discussed. |
英文关键词 | Madden-Julian Oscillation Planetary boundary layer Moisture feedback Frictional convergence feedback |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392307300029 |
WOS关键词 | TROPICAL INTRASEASONAL OSCILLATIONS ; CONVECTIVE ADJUSTMENT SCHEME ; AIR-SEA INTERACTION ; STRATIFORM INSTABILITY ; SKELETON MODEL ; WATER-VAPOR ; PART I ; MJO ; PROPAGATION ; SYSTEM |
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/35459 |
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 & Atmosphere, Ocean Res Ctr, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Liu, Fei,Wang, Bin. Effects of moisture feedback in a frictional coupled Kelvin-Rossby wave model and implication in the Madden-Julian oscillation dynamics[J]. CLIMATE DYNAMICS,2017,48. |
APA | Liu, Fei,&Wang, Bin.(2017).Effects of moisture feedback in a frictional coupled Kelvin-Rossby wave model and implication in the Madden-Julian oscillation dynamics.CLIMATE DYNAMICS,48. |
MLA | Liu, Fei,et al."Effects of moisture feedback in a frictional coupled Kelvin-Rossby wave model and implication in the Madden-Julian oscillation dynamics".CLIMATE DYNAMICS 48(2017). |
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