globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015MS000495
Scopus记录号: 2-s2.0-84959552882
论文题名:
Initiation of an intraseasonal oscillation in an aquaplanet general circulation model
作者: Maloney E; D; , Wolding B; O
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期:4
起始页码: 1956
结束页码: 1976
语种: 英语
英文关键词: Gravity waves ; Moisture ; Aquaplanet ; Control simulation ; General circulation model ; Intraseasonal oscillations ; Kelvin waves ; MJO initiation ; Moisture convergence ; Rossby gyres ; Climatology ; amplitude ; anomaly ; atmospheric convection ; atmospheric moisture ; climate modeling ; general circulation model ; Kelvin wave ; Madden-Julian oscillation ; meridional circulation ; Rossby wave ; seasonal variation ; tropical meteorology
英文摘要: MJO initiation is studied in an aquaplanet general circulation model that has strong and highly regular MJO-like variability. About 80% of MJO events in the model are found to be successive events, immediately preceded by another strong MJO event. Hence, the dynamics of MJO initiation in the model are dominated by interactions with preceding events. Rossby gyres associated with the previous cycle of suppressed MJO convection to the east are shown to help initiate the next cycle of MJO convection in the western warm pool, consistent with the recent study of Zhao et al. (2013). Meridional and vertical moisture advection associated with the anomalous Rossby gyres help to moisten the MJO initiation region in advance of convective onset. An experiment is conducted in which circumnavigating Kelvin waves and their influence on the MJO initiation region are suppressed. While MJO activity in the model is just as regular with suppression of circumnavigation, MJO amplitude is reduced relative to the control simulation, especially in the western part of the warm pool. Possible physical mechanisms responsible for this change in MJO amplitude are discussed, including the role of low-level moisture convergence anomalies induced by circumnavigating Kelvin waves, and interactions with mean state changes. © 2015. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75963
Appears in Collections:影响、适应和脆弱性
气候变化与战略

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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States

Recommended Citation:
Maloney E,D,, Wolding B,et al. Initiation of an intraseasonal oscillation in an aquaplanet general circulation model[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(4)
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