DOI: 10.1002/2016GL067702
论文题名: A mechanism-denial study on the Madden-Julian Oscillation with reduced interference from mean state changes
作者: Ma D. ; Kuang Z.
刊名: Geophysical Research Letters
ISSN: 0094-9254
EISSN: 1944-8985
出版年: 2016
卷: 43, 期: 6 起始页码: 2989
结束页码: 2997
语种: 英语
英文关键词: circumnavigating waves
; extratropical waves
; mechanism-denial study
; MJO
; radiative-convective feedback
; wind-evaporation feedback
Scopus关键词: Evaporation
; Excited states
; Heat convection
; Interference suppression
; Community atmosphere model
; Eastward propagation
; Extratropical
; Intra-seasonal
; Madden-Julian oscillation
; Time invariants
; Time-scales
; Climatology
; atmospheric modeling
; climate feedback
; convective system
; evaporation
; feedback mechanism
; Madden-Julian oscillation
; seasonal variation
; timescale
; wave climate
英文摘要: Mechanism-denial experiments using Superparameterized Community Atmosphere Model are conducted to investigate the importance of extratropical and circumnavigating waves, wind-evaporation feedback, and radiative-convective feedback to the Madden-Julian Oscillation (MJO). A common issue with mechanism-denial studies is the interference from mean state changes when processes are turned off in the model. Here time-invariant forcing and nudging on effective timescales longer than the intraseasonal timescale are implemented to maintain the mean state. The MJO activity remains largely unchanged with suppressed extratropical and circumnavigating waves when the mean state is maintained to be close to that of the control run, suggesting that excitation of MJO by extratropical and circumnavigating waves is not necessary for the existence of MJO in this model. It is also shown that the wind-evaporation feedback slows down eastward propagation of the MJO, and the radiative-convective feedback amplifies the MJO. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84971673284&doi=10.1002%2f2016GL067702&partnerID=40&md5=4fea2e10831175d76e0a594b0c09cd1e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10217
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Ma D.,Kuang Z.. A mechanism-denial study on the Madden-Julian Oscillation with reduced interference from mean state changes[J]. Geophysical Research Letters,2016-01-01,43(6).