DOI: 10.1002/2014GL062518
论文题名: Interpreting the upper level structure of the Madden-Julian oscillation
作者: Monteiro J.M. ; Adames A.F. ; Wallace J.M. ; Sukhatme J.S.
刊名: Geophysical Research Letters
ISSN: 0094-9497
EISSN: 1944-9228
出版年: 2014
卷: 41, 期: 24 起始页码: 9158
结束页码: 9165
语种: 英语
英文关键词: Madden-Julian oscillation
; Matsuno-Gill response
; shallow water model
Scopus关键词: Mechanical waves
; Tropics
; Vorticity
; Wind effects
; Madden-Julian oscillation
; Matsuno-Gill response
; Meridional flows
; Non-linear response
; Quadrupole configuration
; Relative vorticity
; Shallow water model
; Zonal-mean zonal winds
; Climatology
; advection
; heat source
; jet
; Kelvin wave
; Madden-Julian oscillation
; Rossby wave
; shallow water
; vorticity
; wave dispersion
; westerly
; zonal wind
英文摘要: The nonlinear response of a spherical shallow water model to an imposed heat source in the presence of realistic zonal mean zonal winds is investigated numerically. The solutions exhibit elongated, meridionally tilted ridges and troughs indicative of a poleward dispersion of wave activity. As the speed of the jets is increased, the equatorial Kelvin wave is unaffected but the global Rossby wave train coalesces to form a compact, amplified quadrupole structure that bears a striking resemblance to the observed upper level structure of the Madden-Julian oscillation. In the presence of strong subtropical westerly jets, the advection of planetary vorticity by the meridional flow and relative vorticity by the zonally averaged background flow conspire to create the distinctive quadrupole configuration of flanking Rossby waves. Key Points Extension of the Matsuno-Gill model to the sphere with mean subtropical jetsTransition from a Rossby wave train to a subtropical quadrupole is demonstratedImplications for the upper level structure of the MJO are discussed ©2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921719232&doi=10.1002%2f2014GL062518&partnerID=40&md5=7f84b75d1c1524c4b6120b52fb76d62d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6761
Appears in Collections: 气候减缓与适应
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作者单位: Centre for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, India
Recommended Citation:
Monteiro J.M.,Adames A.F.,Wallace J.M.,et al. Interpreting the upper level structure of the Madden-Julian oscillation[J]. Geophysical Research Letters,2014-01-01,41(24).