| DOI: | 10.1002/2013GL058542
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| 论文题名: | A theory of the MJO horizontal scale |
| 作者: | Yang D.; Ingersoll A.P.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10381
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| EISSN: | 1944-10112
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| 出版年: | 2014
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| 卷: | 41, 期:3 | | 起始页码: | 1059
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| 结束页码: | 1064
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| 语种: | 英语
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| 英文关键词: | Climate change
; Gravity waves
; Madden-Julian Oscillation
; Radiative-convective equilibrium
; Triggered convection
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| Scopus关键词: | Climate change
; 2D shallow waters
; Convective events
; Essential elements
; Layer thickness
; Madden-Julian oscillation
; Radiative-convective equilibrium
; Spatial temporals
; Statistically steady state
; Gravity waves
; climate change
; convective system
; frequency analysis
; gravity wave
; Madden-Julian oscillation
; numerical model
; one-dimensional modeling
; parameterization
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| 英文摘要: | Here we ask, what controls the horizontal scale of the Madden-Julian Oscillation, i.e., what controls its zonal wave number k? We present a new one-dimensional (1D) β-plane model that successfully simulates the MJO with the same governing mechanism as the 2D shallow water model of Yang and Ingersoll (2013). Convection is parameterized as a short-duration localized mass source that is triggered when the layer thickness falls below a critical value. Radiation is parameterized as a steady uniform mass sink. Both models tend toward a statistically steady state - a state of radiative-convective equilibrium, not just on a global scale but also on the scale of each MJO event. This gives k ~ (Sc/c)1/2, where Sc is the spatial-temporal frequency of convection events and c is the Kelvin wave speed. We offer this scaling as a prediction of how the MJO would respond to climate change. Key Points Triggered convection is essential for simulating the MJO Interaction of convection with gravity waves is the other essential element The scale of the MJO is controlled by the number density of convective events ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893662670&doi=10.1002%2f2013GL058542&partnerID=40&md5=618fc9c55cc6e4bc73b86d18a8df4a36
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7645
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States
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| Recommended Citation: | |
Yang D.,Ingersoll A.P.. A theory of the MJO horizontal scale[J]. Geophysical Research Letters,2014-01-01,41(3).
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