DOI: 10.1175/JCLI-D-11-00268.1
Scopus记录号: 2-s2.0-84859949982
论文题名: Dynamical ocean forcing of the Madden-Julian oscillation at lead times of up to five months
作者: Webber B.G.M. ; Stevens D.P. ; Matthews A.J. ; Heywood K.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 8 起始页码: 2824
结束页码: 2842
语种: 英语
Scopus关键词: Atmosphere-ocean interactions
; Forcing
; Kelvin waves
; Madden-Julian oscillation
; Ocean dynamics
; Rossby wave
; Coastal zones
; Gravity waves
; Ocean currents
; Wind stress
; Three dimensional
; air-sea interaction
; Kelvin wave
; Madden-Julian oscillation
; numerical model
; Rossby wave
; wind forcing
; Indian Ocean
英文摘要: The authors show that a simple three-dimensional ocean model linearized about a resting basic state can accurately simulate the dynamical ocean response to wind forcing by the Madden-Julian oscillation (MJO). This includes the propagation of equatorial waves in the Indian Ocean, from the generation of oceanic equatorial Kelvin waves to the arrival of downwelling oceanic equatorial Rossby waves in the western Indian Ocean, where they have been shown to trigger MJO convective activity. Simulations with idealized wind forcing suggest that the latitudinal width of this forcing plays a crucial role in determining the potential for such feedbacks. Forcing the model with composite MJO winds accurately captures the global ocean response, demonstrating that the observed ocean dynamical response to theMJOcan be interpreted as a linear response to surface wind forcing. The model is then applied to study "primary" Madden-Julian events, which are not immediately preceded by any MJO activity or by any apparent atmospheric triggers, but have been shown to coincide with the arrival of downwelling oceanic equatorial Rossby waves. Case study simulations show how this oceanic equatorial Rossby wave activity is partly forced by reflection of an oceanic equatorial Kelvin wave triggered by a westerly wind burst 140 days previously, and partly directly forced by easterly wind stress anomalies around 40 days prior to the event. This suggests predictability for primary Madden-Julian events on times scales of up to five months, following the reemergence of oceanic anomalies forced by winds almost half a year earlier. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52465
Appears in Collections: 气候变化事实与影响
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作者单位: School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; School of Mathematics, University of East Anglia, Norwich, United Kingdom
Recommended Citation:
Webber B.G.M.,Stevens D.P.,Matthews A.J.,et al. Dynamical ocean forcing of the Madden-Julian oscillation at lead times of up to five months[J]. Journal of Climate,2012-01-01,25(8)