DOI: 10.1175/JCLI-D-16-0459.1
Scopus记录号: 2-s2.0-85040612395
论文题名: Is there evidence of changes in tropical Atlantic variability modes under AMO phases in the observational record?
作者: Martín-Rey M. ; Polo I. ; Rodríguez-Fonseca B. ; Losada T. ; Lazar A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 2 起始页码: 515
结束页码: 536
语种: 英语
英文关键词: Atmosphere-ocean interaction
; ENSO
; Interannual variability
; Multidecadal variability
; Teleconnections
; Tropical variability
Scopus关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Climate change
; Climatology
; Nickel
; Surface waters
; Tropics
; Atmosphere-ocean interactions
; ENSO
; Interannual variability
; Multidecadal variability
; Teleconnections
; Tropical variability
; Oceanography
; air-sea interaction
; annual variation
; Atlantic Multidecadal Oscillation
; climate variation
; decadal variation
; El Nino-Southern Oscillation
; North Atlantic Oscillation
; sea surface temperature
; teleconnection
; Tomato aspermy virus
英文摘要: The Atlantic multidecadal oscillation (AMO) is the leading mode of Atlantic sea surface temperature (SST) variability at multidecadal time scales. Previous studies have shown that the AMO could modulate El Niño-Southern Oscillation (ENSO) variance. However, the role played by the AMO in the tropical Atlantic variability (TAV) is still uncertain. Here, it is demonstrated that during negative AMO phases, associated with a shallower thermocline, the eastern equatorial Atlantic SST variability is enhanced by more than 150% in boreal summer. Consequently, the interannual TAV modes are modified. During negative AMO, the Atlantic Niño displays larger amplitude and a westward extension and it is preceded by a simultaneous weakening of both subtropical highs in winter and spring. In contrast, a meridional seesaw SLP pattern evolving into a zonal gradient leads the Atlantic Niño during positive AMO. The north tropical Atlantic (NTA) mode is related to a Scandinavian blocking pattern during winter and spring in negative AMO, while under positive AMO it is part of the SST tripole associated with the North Atlantic Oscillation. Interestingly, the emergence of an overlooked variability mode, here called the horseshoe (HS) pattern on account of its shape, is favored during negative AMO. This anomalous warm (cool) HS surrounding an eastern equatorial cooling (warming) is remotely forced by an ENSO phenomenon. During negative AMO, the tropical-extratropical teleconnections are enhanced and the Walker circulation is altered. This, together with the increased equatorial SST variability, could promote the ENSO impacts on TAV. The results herein give a step forward in the better understanding of TAV, which is essential to improving its modeling, impacts, and predictability. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111717
Appears in Collections: 气候减缓与适应
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作者单位: Departamento de Física de la Tierra, Astronomia y Astrofisica I (Geofisica y Meteorologia), Facultad de Ciencias Físicas, Universidad Complutense de Madrid, Madrid, Spain; LOCEAN-IPSL, UPMC, Sorbonne Universités, Paris, France; Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Martín-Rey M.,Polo I.,Rodríguez-Fonseca B.,et al. Is there evidence of changes in tropical Atlantic variability modes under AMO phases in the observational record?[J]. Journal of Climate,2018-01-01,31(2)