DOI: 10.1175/JCLI-D-11-00463.1
Scopus记录号: 2-s2.0-84858602225
论文题名: Variability of the atlantic meridional overturning circulation in CCSM4
作者: Danabasoglu G. ; Yeager S.G. ; Kwon Y.-O. ; Tribbia J.J. ; Phillips A.S. ; Hurrell J.W.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 15 起始页码: 5153
结束页码: 5172
语种: 英语
Scopus关键词: Atlantic meridional overturning circulations
; Boundary layer depth
; Broad spectrum
; Community climate system model
; Control simulation
; Coupled models
; Deep-water formation
; Density anomalies
; Density difference
; Horizontal resolution
; Labrador Sea
; Low frequency variability
; Meridional overturning circulations
; Mesoscale
; Multidecadal variability
; North Atlantic oscillations
; Ocean model
; Oceanic variability
; Parameterized
; Pre-industrial
; Sub-mesoscale eddies
; Subpolar gyres
; Surface flux
; Atmospheric pressure
; Climate models
; Oceanography
; boundary layer
; climate modeling
; computer simulation
; density
; gyre
; meridional circulation
; mesoscale eddy
; North Atlantic Oscillation
; overturn
; parameterization
; salinity
; stratification
; Arctic Ocean
; Atlantic Ocean
; Labrador Sea
; Norwegian Sea
英文摘要: Atlantic meridional overturning circulation (AMOC) variability is documented in the Community Climate System Model, version 4 (CCSM4) preindustrial control simulation that uses nominal 18 horizontal resolution in all its components. AMOC shows a broad spectrum of low-frequency variability covering the 50-200-yr range, contrasting sharply with the multidecadal variability seen in the T85 × 1 resolution CCSM3 presentday control simulation. Furthermore, the amplitude of variability is much reduced in CCSM4 compared to that of CCSM3. Similarities as well as differences in AMOC variability mechanisms between CCSM3 and CCSM4 are discussed.As in CCSM3, the CCSM4AMOCvariability is primarily driven by the positive density anomalies at the Labrador Sea (LS) deep-water formation site, peaking 2 yr prior to an AMOC maximum. All processes, including parameterized mesoscale and submesoscale eddies, play a role in the creation of salinity anomalies that dominate these density anomalies.HighNordic Sea densities do not necessarily lead to increased overflow transports because the overflow physics is governed by source and interior region density differences. Increased overflow transports do not lead to a higher AMOC either but instead appear to be a precursor to lower AMOC transports through enhanced stratification in LS. This has important implications for decadal prediction studies. The North Atlantic Oscillation (NAO) is significantly correlated with the positive boundary layer depth and density anomalies prior to an AMOC maximum. This suggests a role for NAO through setting the surface flux anomalies in LS and affecting the subpolar gyre circulation strength. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52286
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: National Center for Atmospheric Research, Boulder, CO, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Recommended Citation:
Danabasoglu G.,Yeager S.G.,Kwon Y.-O.,et al. Variability of the atlantic meridional overturning circulation in CCSM4[J]. Journal of Climate,2012-01-01,25(15)