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DOI | 10.1007/s00382-018-4407-9 |
Improving MJO simulation by enhancing the interaction between boundary layer convergence and lower tropospheric heating | |
Yang, Young-Min1,2,3; Wang, Bin1,2,3 | |
2019-04-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:4671-4693 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | It has been a great challenge for global weather and climate models to simulate realistic Madden-Julian Oscillation (MJO) while keeping global energy and water balance unaffected. This work demonstrates that, in the Nanjing University of Information Science and Technology Earth System Model, enhanced boundary layer (BL) convergence feedback to the lower tropospheric heating in both the modified Tidtke (TDK) and relaxed Arakawa-Schubert (RAS) convective schemes have significantly improved the quality of MJO simulation in terms of both the eastward propagation and three-dimensional dynamic and thermodynamic structures. The modifications to the TDK and RAS schemes include (a) a BL depth-dependent convective inhibition, and (b) a bottom-heavy diffusivity in the shallow convection scheme. To understand how these modifications improved the MJO simulation, we applied dynamics-oriented diagnostics to reveal the critical role of the interaction between the lower-tropospheric heating and the BL convergence. The modified schemes enhance the lower-tropospheric diabatic heating to the east of the MJO convective center, which leads to increased Kelvin wave easterly winds. The strengthened MJO easterly winds reinforce the BL moisture convergence to the east of the MJO center and therefore result in increased upward transports of moisture and heat from the BL to the free atmosphere, which further moisten and destabilize the lower troposphere and thereby increase the lower-tropospheric heating. The positive feedback between the BL convergence and lower tropospheric heating improves MJO eddy available potential energy generation to the east of major convection and promotes MJO eastward propagation. The results indicate that correct simulation of the heating induced by shallow and/or congestus clouds and its interaction with BL dynamics is critical for realistic simulation of the MJO as suggested by the trio-interaction theory. |
英文关键词 | MJO MJO simulation MJO dynamics Boundary layer convergence feedback Shallow and congestus clouds |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467187600048 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; MOIST STATIC ENERGY ; TROPICAL INTRASEASONAL OSCILLATION ; TRIMODAL CHARACTERISTICS ; STRATIFORM INSTABILITY ; EASTWARD PROPAGATION ; CLOUD-RADIATION ; SYSTEM MODEL ; LIFE-CYCLE ; CONVECTION |
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/181918 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Minist Educ, Key Lab Meteorol Disaster, Earth Syst Modeling Ctr, Nanjing, Jiangsu, Peoples R China; 2.Univ Hawaii, Dept Atmospher Sci, Honolulu, HI 96822 USA; 3.Univ Hawaii, Int Pacific Res Ctr, Honolulu, HI 96822 USA |
推荐引用方式 GB/T 7714 | Yang, Young-Min,Wang, Bin. Improving MJO simulation by enhancing the interaction between boundary layer convergence and lower tropospheric heating[J]. CLIMATE DYNAMICS,2019,52:4671-4693. |
APA | Yang, Young-Min,&Wang, Bin.(2019).Improving MJO simulation by enhancing the interaction between boundary layer convergence and lower tropospheric heating.CLIMATE DYNAMICS,52,4671-4693. |
MLA | Yang, Young-Min,et al."Improving MJO simulation by enhancing the interaction between boundary layer convergence and lower tropospheric heating".CLIMATE DYNAMICS 52(2019):4671-4693. |
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