DOI: 10.1175/JCLI-D-17-0905.1
Scopus记录号: 2-s2.0-85047055332
论文题名: Eastern pacific ITCZ dipole and ENSO diversity
作者: Xie S.-P. ; Peng Q. ; Kamae Y. ; Zheng X.-T. ; Tokinaga H. ; Wang D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 11 起始页码: 4449
结束页码: 4462
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Dynamics
; ENSO
; Large-scale motions
; Rainbands
; Upwelling/downwelling
Scopus关键词: Atmospheric movements
; Atmospheric pressure
; Atmospheric thermodynamics
; Dynamics
; Natural convection
; Oceanography
; Precipitation (meteorology)
; Surface waters
; Atmosphere-ocean interactions
; ENSO
; Large scale motion
; Rainbands
; Upwelling/downwelling
; Climatology
; air-sea interaction
; atmospheric convection
; atmospheric dynamics
; downwelling
; El Nino-Southern Oscillation
; intertropical convergence zone
; Northern Hemisphere
; rainband
; sea surface temperature
; Southern Hemisphere
; upwelling
; warming
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (Equatorial)
; Pacific Ocean (Tropical)
英文摘要: The eastern tropical Pacific features strong climatic asymmetry across the equator, with the intertropical convergence zone (ITCZ) displaced north of the equator most of time. In February-April (FMA), the seasonal warming in the Southern Hemisphere and cooling in the Northern Hemisphere weaken the climatic asymmetry, and a double ITCZ appears with a zonal rainband on either side of the equator. Results from an analysis of precipitation variability reveal that the relative strength between the northern and southern ITCZ varies from one year to another and this meridional seesaw results from ocean-atmosphere coupling. Surprisingly this meridional seesaw is triggered by an El Niño-Southern Oscillation (ENSO) of moderate amplitudes. Although ENSO is originally symmetric about the equator, the asymmetry in the mean climate in the preceding season introduces asymmetric perturbations, which are then preferentially amplified by coupled ocean-atmosphere feedback in FMA when deep convection is sensitive to small changes in cross-equatorial gradient of sea surface temperature. This study shows that moderate ENSO follows a distinct decay trajectory in FMA and southeasterly cross-equatorial wind anomalies cause moderate El Niño to dissipate rapidly as southeasterly cross-equatorial wind anomalies intensify ocean upwelling south of the equator. In contrast, extreme El Niño remains strong through FMA as enhanced deep convection causes westerly wind anomalies to intrude and suppress ocean upwelling in the eastern equatorial Pacific. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111524
Appears in Collections: 气候减缓与适应
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Physical Oceanography Laboratory, Ocean University of China, Qingdao, China; Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China; Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan; Hakubi Center for Advanced Research and Disaster Prevention Research Institute, Kyoto University, Uji, Japan
Recommended Citation:
Xie S.-P.,Peng Q.,Kamae Y.,et al. Eastern pacific ITCZ dipole and ENSO diversity[J]. Journal of Climate,2018-01-01,31(11)