DOI: 10.1175/JCLI-D-17-0842.1
Scopus记录号: 2-s2.0-85053025622
论文题名: The nature of the stochastic wind forcing of ENSO
作者: Capotondi A. ; Sardeshmukh P.D. ; Ricciardulli L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 8081
结束页码: 8099
语种: 英语
英文关键词: El Nino
; ENSO
; La Nina
; Madden-Julian oscillation
Scopus关键词: Atmospheric pressure
; Gravity waves
; Spectrum analysis
; Stochastic systems
; Atmosphere ocean variability
; EL Nino
; ENSO
; High frequency winds
; La nina
; Low-frequency components
; Madden-Julian oscillation
; Oceanic Kelvin waves
; Climatology
英文摘要: El Niño-Southern Oscillation (ENSO) is commonly viewed as a low-frequency tropical mode of coupled atmosphere-ocean variability energized by stochastic wind forcing. Despite many studies, however, the nature of this broadband stochastic forcing and the relative roles of its high- and low-frequency components in ENSO development remain unclear. In one view, the high-frequency forcing associated with the subseasonal Madden-Julian oscillation (MJO) and westerly wind events (WWEs) excites oceanic Kelvin waves leading to ENSO. An alternative view emphasizes the role of the low-frequency stochastic wind components in directly forcing the low-frequency ENSO modes. These apparently distinct roles of the wind forcing are clarified here using a recently released high-resolution wind dataset for 1990-2015. A spectral analysis shows that although the high-frequency winds do excite high-frequency Kelvin waves, they are much weaker than their interannual counterparts and are a minor contributor to ENSO development. The analysis also suggests that WWEs should be viewed more as short-correlation events with a flat spectrum at low frequencies that can efficiently excite ENSO modes than as strictly high-frequency events that would be highly inefficient in this regard. Interestingly, the low-frequency power of the rapid wind forcing is found to be higher during El Niño than La Niña events, suggesting a role also for state-dependent (i.e., multiplicative) noise forcing in ENSO dynamics. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110642
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: University of Colorado, Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States; NOAA, Earth System Research Laboratory, Physical Sciences Division, Boulder, CO, United States; Remote Sensing Systems, Santa Rosa, CA, United States
Recommended Citation:
Capotondi A.,Sardeshmukh P.D.,Ricciardulli L.. The nature of the stochastic wind forcing of ENSO[J]. Journal of Climate,2018-01-01,31(19)