DOI: 10.1175/JCLI-D-16-0047.1
Scopus记录号: 2-s2.0-84983508918
论文题名: The role of reversed equatorial zonal transport in terminating an ENSO event
作者: Chen H.-C. ; Hu Z.-Z. ; Huang B. ; Sui C.-H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 16 起始页码: 5859
结束页码: 5877
语种: 英语
Scopus关键词: Advection
; Nickel
; Oceanography
; Eastern equatorial Pacific
; Eastern pacific
; Equatorial Pacific
; Oceanic control
; SST anomalies
; Thermocline depth
; Wind anomalies
; Zonal transport
; Stream flow
英文摘要: This study shows the sudden basinwide reversal of anomalous equatorial zonal transport above the thermocline at the peaking phase of ENSO triggers rapid termination of ENSO events. The anomalous equatorial zonal transport is controlled by the concavity of anomalous thermocline meridional structure across the equator. During the developing phase of ENSO, opposite zonal transport anomalies form in the westerncentral and central-eastern equatorial Pacific, respectively. Both are driven by the equatorial thermocline anomalies in response to zonal wind anomalies over the western-central equatorial ocean. At this stage, the anomalous zonal transport in the east enhances ENSO growth through zonal SST advection. In the mature phase of ENSO, off-equatorial thermocline depth anomalies become more dominant in the eastern Pacific because of the reflection of equatorial signals at the eastern boundary. As a result, the meridional concavity of the thermocline anomalies is reversed in the east. This change reverses zonal transport rapidly in the centralto- eastern equatorial Pacific, joining with the existing reversed zonal transport anomalies farther to the west, and forms a basinwide transport reversal throughout the equatorial Pacific. This basinwide transport reversal weakens the ENSO SST anomalies by reversed advection. More importantly, the reversed zonal transport reduces the existing zonal tilting of the equatorial thermocline and weakens its feedback to wind anomalies effectively. This basinwide reversal is built in at the peak phase of ENSO as an oceanic control on the evolution of both El Niño and La Niña events. The reversed zonal transport anomaly after the mature phase weakens El Niño in the eastern Pacific more efficiently than it weakens La Niña. © 2016 American Meteorological Society. 资助项目: MOST, Ministry of Science and Technology
; MOST, Ministry of Science and Technology
; NSF, Norwegian Nurses Organisation
; NOAA, National Oceanic and Atmospheric Administration
; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50044
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan; Department of Atmospheric, Oceanic and Earth Sciences, College of Science, George Mason University, Fairfax, VA, United States; NOAA, NWS, NCEP/Climate Prediction Center, College Park, MD, United States
Recommended Citation:
Chen H.-C.,Hu Z.-Z.,Huang B.,et al. The role of reversed equatorial zonal transport in terminating an ENSO event[J]. Journal of Climate,2016-01-01,29(16)