DOI: 10.1007/s00382-017-3710-1
Scopus记录号: 2-s2.0-85019841515
论文题名: Role of the meridional dipole of SSTA and associated cross-equatorial flow in the tropical eastern Pacific in terminating the 2014 El Niño development
作者: Wu Y.-K. ; Chen L. ; Hong C.-C. ; Li T. ; Chen C.-T. ; Wang L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-05-06 起始页码: 1625
结束页码: 1638
语种: 英语
英文关键词: 2014–2015 El Niño
; Cross-equatorial flow
; ENSO
; Meridional dipole of SSTA in eastern Pacific
; Ocean–atmosphere interaction
Scopus关键词: air-sea interaction
; El Nino
; El Nino-Southern Oscillation
; equatorial dynamics
; meridional circulation
; numerical model
; sea surface temperature
; summer
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (Tropical)
英文摘要: In the boreal spring of 2014, the oceanic and atmospheric conditions were favorable for an El Niño's development. It was predicted that in 2014, a super El Niño or at least a regular El Niño with normal magnitude, would initiate. However, the growth rate of the sea surface temperature anomaly (SSTA) in the equatorial eastern Pacific suddenly declined in the boreal summer. The physical processes responsible for the termination of the 2014 El Niño were addressed in this study. We hypothesized that a meridional dipole of SSTA, characterized by a pronounced warm SSTA over the eastern North Pacific (ENP) and cold SSTA over the eastern South Pacific (ESP), played a crucial role in blocking the 2014 El Niño’s development. The observational analysis revealed that the meridional dipole of SSTA and the relevant anomalous cross-equatorial flow in the tropical eastern Pacific, induced anomalous westward (u′OpenSPiltSPi 0) and upwelling (w′CloseSPigtSPi 0) currents in the equatorial eastern Pacific, leading to negative anomalous zonal advection term (- u′∂T¯ / ∂xOpenSPiltSPi 0) and anomalous upwelling advection term (- w′∂T¯ / ∂zOpenSPiltSPi 0). Additionally, the anomalous cross-equatorial flow also induced northward meridional current anomalies that transported subtropical cold water to the equator. All the changes of the oceanic dynamic terms collectively caused negative SSTA tendency in the boreal summer, and thus killed off the budding 2014 El Niño. The idealized numerical experiments further confirmed that the 2014 El Niño’s development could be suppressed by the meridional dipole of SSTA, and both the ENP pole and ESP pole make a contribution. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109415
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan; Department of Earth and Life Sciences, University of Taipei, Taipei, Taiwan; International Pacific Research Center (IPRC), and Department of Atmospheric Sciences, SOEST, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environmental Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China
Recommended Citation:
Wu Y.-K.,Chen L.,Hong C.-C.,et al. Role of the meridional dipole of SSTA and associated cross-equatorial flow in the tropical eastern Pacific in terminating the 2014 El Niño development[J]. Climate Dynamics,2018-01-01,50(2018-05-06)