globalchange  > 过去全球变化的重建
DOI: 10.1007/s00382-013-1754-4
Scopus记录号: 2-s2.0-84894297137
论文题名:
ENSO-phase dependent TD and MRG wave activity in the western North Pacific
作者: Wu L.; Wen Z.; Li T.; Huang R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期:2017-05-06
起始页码: 1217
结束页码: 1227
语种: 英语
英文关键词: ENSO ; MRG waves ; TD waves ; Western North Pacific
英文摘要: The three-dimensional structure and evolution characteristics of tropical depression (TD) and mixed Rossby-gravity wave (MRG) type disturbances in the tropical western North Pacific during El Niño and La Niña summers are investigated based on observational and reanalysis data. A clear MRG-to-TD transition was observed during El Niño summers while such a transition is unclear during La Niña summers. The vertical structure of the TD-MRG waves appears equivalent barotropic during El Niño but becomes tilted eastward with height during La Niña. The diagnosis of barotropic energy conversion shows that both the rotational and divergent components of the background flow change associated with E1 Niño-Southern Oscillation (ENSO) are responsible for energy conversion from the mean flow to the TD-MRG perturbations. A further examination of the pure MRG mode shows that its intensity does not vary between El Niño and La Niña while its phase speed does. A faster (slower) westward propagation speed during La Niña (El Niña) is attributed to enhanced (reduced) mean easterlies in the western equatorial Pacific. The heating associated with the MRG wave appears more anti-symmetric during La Niña than during El Niño. In contrast to the MRG waves, the amplitude of the TD waves depends greatly on the ENSO phase. The enhanced (suppressed) TD disturbances during El Niño (La Niña) is attributed to greater (less) barotropic energy conversion associated with the background flow change. The vertical structure of the TD waves appears quasi-barotropic in the geopotential height field but baroclinic in the divergence field. © 2013 Springer-Verlag Berlin Heidelberg.
资助项目: NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; ONR, Office of Naval Research ; ONR, Office of Naval Research ; NOAA, National Oceanic and Atmospheric Administration ; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54255
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作者单位: Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Center for Monsoon and Environment Research/Department of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China; International Pacific Research Center and Department of Meteorology, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI, United States

Recommended Citation:
Wu L.,Wen Z.,Li T.,et al. ENSO-phase dependent TD and MRG wave activity in the western North Pacific[J]. Climate Dynamics,2014-01-01,42(2017-05-06)
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