DOI: 10.1175/JCLI-D-11-00364.1
Scopus记录号: 2-s2.0-84861386859
论文题名: The role of ocean dynamics in the interaction between the Atlantic meridional and equatorial modes
作者: Zhu J. ; Huang B. ; Wu Z.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 10 起始页码: 3583
结束页码: 3598
语种: 英语
Scopus关键词: Atmosphere-ocean interactions
; Ocean dynamics
; Oceanic mixed layers
; Oceanic variability
; Tropical variabilty
; Atmospheric pressure
; Dynamics
; Nickel compounds
; Time measurement
; Tropics
; Waveguides
; Oceanography
; atmosphere-hydrosphere interaction
; El Nino-Southern Oscillation
; equatorial dynamics
; global ocean
; heat transfer
; meridional circulation
; mixed layer
; wind forcing
; Atlantic Ocean
; Atlantic Ocean (Tropical)
英文摘要: This study examines a mechanism of the interaction between the tropical Atlantic meridional and equatorial modes. To derive robust heat content (HC) variability, the ensemble-mean HC anomalies (HCA) of six state-of-the-art global ocean reanalyses for 1979-2007 are analyzed. Compared with previous studies, characteristic oceanic processes are distinguished through their dominant time scales. Using the ensemble empirical mode decomposition (EEMD) method, the HC fields are first decomposed into components with different time scales. The authors' analysis shows that these components are associated with distinctive ocean dynamics. The high-frequency (first three) components can be characterized as the equatorial modes, whereas the low-frequency (the fifth and sixth) components are featured as the meridional modes. In between, the fourth component on the time scale of 3-4yr demonstrates "mixed" characteristics of the meridional and equatorial modes because of an active transition from the predominant meridional to zonal structures on this time scale. Physically, this transition process is initiated by the discharge of the off-equatorial HCA, which is first accumulated as a part of the meridional mode, into the equatorial waveguide, which is triggered by the breakdown of the equilibrium between the cross-equatorial HC contrast and the overlying wind forcing, and results in a major heat transport through the equatorial waveguide into the southeastern tropical Atlantic. It is also shown that remote forcing from El Niño-Southern Oscillation (ENSO) exerts important influence on the transition from the equatorial to meridional mode and may partly dictate its time scale of 3-4yr. Therefore, the authors' results demonstrate another mechanism of the equatorial Atlantic response to the ENSO forcing. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52429
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, Calverton, MD, United States; Center for Ocean-Land-Atmosphere Studies, Institute of Global Environment and Society, Calverton, MD, United States; Department of Atmospheric, Oceanic, and Earth Sciences, College of Science, George Mason University, Fairfax, VA, United States; Department of Meteorology, Center for Ocean-Atmospheric Prediction Studies, The Florida State University, Tallahassee, FL, United States
Recommended Citation:
Zhu J.,Huang B.,Wu Z.. The role of ocean dynamics in the interaction between the Atlantic meridional and equatorial modes[J]. Journal of Climate,2012-01-01,25(10)