DOI: 10.1175/JCLI-D-13-00547.1
Scopus记录号: 2-s2.0-84900449916
论文题名: Subseasonal atmospheric variability and El Niño waveguide warming: Observed effects of the Madden-Julian oscillation and westerly wind events
作者: Chiodi A.M. ; Harrison D.E. ; Vecchi G.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 10 起始页码: 3619
结束页码: 3642
语种: 英语
Scopus关键词: Atmospheric pressure
; Climate change
; Oceanography
; Atmospheric variability
; Equatorial Pacific
; Madden-Julian oscillation
; Neutral state
; Ocean general circulation models
; Sea surface temperature anomalies
; Surface winds
; Westerly winds
; Waveguides
; air-sea interaction
; atmospheric modeling
; El Nino-Southern Oscillation
; Madden-Julian oscillation
; oceanic general circulation model
; sea surface temperature
; temperature anomaly
; wave field
; westerly
; wind field
; wind stress
; zonal wind
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (Tropical)
英文摘要: Westerly wind events (WWEs) have previously been shown to initiate equatorial Pacific waveguide warming. The relationship between WWEs and Madden-Julian oscillation (MJO) activity, as well as the role of MJO events in initiating waveguide warming, is reconsidered here over the 1986-2010 period. WWEs are identified in observations of near-surface zonal winds using an objective scheme. MJO events are defined using a widely used index, and 64 are identified that occur when the El Niño-Southern Oscillation (ENSO) is in its neutral state. Of these MJO events, 43 have one or more embeddedWWEsand 21 do not. The evolution of sea surface temperature anomaly over the equatorial Pacific waveguide following the westerly surface wind phase of the MJO over the western equatorial Pacific is examined.Waveguide warming is found for the MJO withWWEevents in similar magnitudes as following the WWEsnot embedded in an MJO. There is very little statistically significant waveguide warming following MJO events that do not contain an embedded WWE. The observed SST anomaly changes are well reproduced in an ocean general circulation model forced with the respective composite wind stress anomalies. Further, it is found that the occurrence of an MJO event does not significantly affect the likelihood that a WWE will occur. These results extend and confirm the earlier results of Vecchi with a near doubling of the period of study. It is suggested that understanding the sources and predictability of tropical Pacific westerly wind events remains essential to improving predictions of the onset of El Niño events. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51465
Appears in Collections: 气候变化事实与影响
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作者单位: Joint Institute for the Study of the Atmosphere and Ocean, University of Washington, Seattle, WA, United States; NOAA/Pacific Marine Environmental Laboratory, Seattle, WA, United States; Geophysical Fluid Dynamics Laboratory, Princeton University, Princeton, NJ, United States
Recommended Citation:
Chiodi A.M.,Harrison D.E.,Vecchi G.A.. Subseasonal atmospheric variability and El Niño waveguide warming: Observed effects of the Madden-Julian oscillation and westerly wind events[J]. Journal of Climate,2014-01-01,27(10)