DOI: 10.1175/JCLI-D-17-0329.1
Scopus记录号: 2-s2.0-85049727248
论文题名: Combined role of high- and low-frequency processes of equatorial zonal transport in terminating an ENSO event
作者: Chen H.-C. ; Sui C.-H. ; Tseng Y.-H. ; Huang B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 14 起始页码: 5461
结束页码: 5483
语种: 英语
英文关键词: ENSO
; Kelvin waves
; Ocean dynamics
; Wind bursts
Scopus关键词: Climate change
; Coastal zones
; Gravity waves
; Oceanography
; Stream flow
; Wave propagation
; Wind effects
; Eastward propagation
; ENSO
; Equatorial Rossby waves
; Kelvin wave propagation
; Kelvin waves
; Low and high frequencies
; Ocean dynamics
; Westerly wind bursts
; High pass filters
; El Nino-Southern Oscillation
; equatorial dynamics
; Kelvin wave
; ocean wave
; oceanic current
; Rossby wave
; thermocline
; wave propagation
; zonal flow
; Pacific Ocean
英文摘要: This study investigates the sudden reversal of anomalous zonal equatorial transport above thermocline at the peak phase of ENSO. The oceanic processes associated with zonal transport are separated into low-frequency ENSO cycle and high-frequency oceanic wave processes. Both processes can generate a reversal of equatorial zonal current at the ENSO peak phase, which is a trigger for the rapid termination of ENSO events. For the low-frequency process, zonal transport exhibits slower and basinwide evolution. During the developing phase of El Niño (La Niña), eastward (westward) transport prevails in the central-eastern Pacific, which enhances ENSO. At the peak of ENSO, a basinwide reversal of the zonal transport resulting from the recharge-discharge process occurs and weakens the existing SST anomalies. High-frequency zonal transport presents clear eastward propagation related to Kelvin wave propagation at the equator, reflection at the eastern boundary, and the westward propagating Rossby waves. The major westerly wind bursts (easterly wind surges) occur in late boreal summer and fall with coincident downwelling (upwelling) Kelvin waves for El Niño (La Niña) events. After the peak of El Niño (La Niña), Kelvin waves reach the eastern boundary in boreal winter and reflect as off-equatorial Rossby waves; then, the zonal transport switches from eastward (westward) to westward (eastward). The high-frequency zonal transport can be represented by equatorial wave dynamics captured by the first three EOFs based on the high-pass-filtered equatorial thermocline. The transport anomaly during the decaying phase is dominated by the low-frequency process in El Niño. However, the transport anomaly is caused by both low- and high-frequency processes during La Niña. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111459
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan; Institute of Oceanography, National Taiwan University, Taipei, Taiwan; Department of Atmospheric, Oceanic and Earth Sciences, College of Science, George Mason University, Fairfax, VA, United States
Recommended Citation:
Chen H.-C.,Sui C.-H.,Tseng Y.-H.,et al. Combined role of high- and low-frequency processes of equatorial zonal transport in terminating an ENSO event[J]. Journal of Climate,2018-01-01,31(14)