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DOI | 10.1029/2018GL081612 |
Mechanisms of Northward Propagation of Boreal Summer Intraseasonal Oscillation Revealed by Climate Model Experiments | |
Yang, Young-Min1,2,3,4; Wang, Bin1,2,3,4; Lee, June-Yi5,6,7 | |
2019-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:6页码:3417-3425 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; South Korea |
英文摘要 | Northward propagation of the boreal summer intraseasonal oscillation (ISO) has profound impacts on Northern Hemisphere extreme weather events. This study aims to test the hypotheses proposed in the previous studies to explain northward propagation of the ISO by drastically changing the climatological mean states through lowering the Tibetan Plateau (TP) with a fully coupled Earth system model, Nanjing University of Information Science and Technology Earth System Model version 3.0. The model reproduces realistic ISO over South Asia and the northern Indian Ocean. The results show that ISO northward propagations significantly weaken with decreased elevation of the TP. Lowering the TP reduces the vertical shear of the mean monsoon circulation over the northern Indian Ocean. The reduced vertical shear deteriorates the generation of positive vorticity anomalies and boundary layer moisture convergence to the north of ISO precipitation center, thereby weakening northward propagation of the ISO. On the other hand, the boundary layer moisture advection and air-sea interaction do not change appreciably when the TP elevation is reduced. These results suggest that the mean state vertical shear is most critical for the ISO northward propagation. Plain language summary In boreal summer, a heavy precipitation belt slowly moves from the equatorial Indian Ocean to south Asian monsoon regions on a 2- to 6-week time scale, which affects extreme weather events over Asia. Therefore, understanding the causes of the northward movement of tropical precipitation belt is societally important. For this purpose, we performed a set of climate model experiments in which we reduced the topography over the Tibetan Plateau (TP). We found that northward movement of tropical precipitation significantly weakened with decreasing elevation of the TP. Lowering the TP changes the mean circulation over the eastern Indian Ocean. The changed mean circulation weakens boundary layer moisture convergence to the north of the precipitation belt, which deteriorates the northward movement of the tropical precipitation. We highlight that the mean state vertical shear is important for the northward movement of tropical precipitation anomalies. |
英文关键词 | ISO ISO northward propagation boreal summer ISO (BSISO) ISO simulation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464650400044 |
WOS关键词 | FREQUENCY EQUATORIAL WAVES ; SHEARED ZONAL FLOW ; ERA-INTERIM ; SIMULATION ; CONVECTION ; DYNAMICS ; PRECIPITATION ; BREAKS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/181791 |
专题 | 气候变化 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Minist Educ, Key Lab Meteorol Disaster, Nanjing, Jiangsu, Peoples R China; 2.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, Nanjing, Jiangsu, Peoples R China; 3.Univ Hawaii Manoa, Dept Atmospher Sci, Honolulu, HI 96822 USA; 4.Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA; 5.Pusan Natl Univ, Res Ctr Climate Sci, Busan, South Korea; 6.Pusan Natl Univ, Dept Climate Syst, Busan, South Korea; 7.Inst Basic Sci, Ctr Climate Phys, Busan, South Korea |
推荐引用方式 GB/T 7714 | Yang, Young-Min,Wang, Bin,Lee, June-Yi. Mechanisms of Northward Propagation of Boreal Summer Intraseasonal Oscillation Revealed by Climate Model Experiments[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(6):3417-3425. |
APA | Yang, Young-Min,Wang, Bin,&Lee, June-Yi.(2019).Mechanisms of Northward Propagation of Boreal Summer Intraseasonal Oscillation Revealed by Climate Model Experiments.GEOPHYSICAL RESEARCH LETTERS,46(6),3417-3425. |
MLA | Yang, Young-Min,et al."Mechanisms of Northward Propagation of Boreal Summer Intraseasonal Oscillation Revealed by Climate Model Experiments".GEOPHYSICAL RESEARCH LETTERS 46.6(2019):3417-3425. |
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