globalchange  > 气候减缓与适应
DOI: 10.1175/JCLI-D-17-0749.1
Scopus记录号: 2-s2.0-85052783022
论文题名:
Impact of Rossby and Kelvin wave components on MJO eastward propagation
作者: Wang L.; Li T.; Nasuno T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期:17
起始页码: 6913
结束页码: 6931
语种: 英语
英文关键词: Atmosphere ; Climate models ; Dynamics ; Kelvin waves ; Madden-Julian oscillation ; Rossby waves
Scopus关键词: Climate models ; Coastal zones ; Dynamics ; Earth atmosphere ; Gravity waves ; Acceleration effects ; Atmospheric systems ; Eastward propagation ; General circulation model ; Kelvin waves ; Madden-Julian oscillation ; Multi-Model Simulations ; Rossby wave ; Climatology
英文摘要: There are contrasting views concerning the impact of Rossby wave component of MJO flow on its eastward propagation. One view (called ''drag effect'') argues that because Rossby waves propagate westward, a stronger Rossby wave component slows down the eastward propagation. The other view (called ''acceleration effect'') argues that a stronger Rossby wave enhances east-west asymmetry of moist static energy (MSE) tendency and thus favors the eastward propagation. This study aims to resolve this issue through diagnosis of both idealized aquaplanet simulations and 26 models from the MJO Task Force/GEWEX Atmospheric System Studies (MJOTF/GASS). In the aquaplanet experiments, three sets of zonally uniform, equatorially symmetric SST distributions are specified. The MJO phase speed is faster in the presence of a narrower SST meridional profile, in which both the Rossby and the Kelvin wave components are stronger and the east-west asymmetry of MSE tendency is larger. A further analysis of the 26 general circulation models reveals that the MJO propagation skill and phase speed are positively correlated to both the Rossby wave and the Kelvin wave strength in the lower free atmosphere (above 800 hPa). Models that have a stronger Rossby and Kelvin wave component tend to simulate realistic and faster eastward propagation. Therefore, both the aquaplanet and the multimodel simulations support the Rossby wave acceleration effect hypothesis. © 2018 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111385
Appears in Collections:气候减缓与适应

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作者单位: Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, China; Joint International Research Laboratory of Climate and Environmental Change, Nanjing University of Information Science and Technology, Nanjing, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center, University of Hawai'i at Manoa, Honolulu, HI, United States; School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu, HI, United States; Department of Seamless Environmental Prediction Research, JAMSTEC, Yokohama, Japan

Recommended Citation:
Wang L.,Li T.,Nasuno T.. Impact of Rossby and Kelvin wave components on MJO eastward propagation[J]. Journal of Climate,2018-01-01,31(17)
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