DOI: 10.1175/JCLI-D-15-0106.1
Scopus记录号: 2-s2.0-84946590876
论文题名: A mechanism of internal decadal Atlantic Ocean variability in a high-resolution coupled climate model
作者: Menary M.B. ; Hodson D.L.R. ; Robson J.I. ; Sutton R.T. ; Wood R.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 19 起始页码: 7764
结束页码: 7785
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Atmospheric thermodynamics
; Feedback
; Forecasting
; Oceanography
; Surface waters
; Atmosphere-ocean interactions
; Decadal variability
; North Atlantic Ocean
; Sea surface temperature (SST)
; Thermohaline circulations
; Climate models
; air-sea interaction
; climate modeling
; decadal variation
; gyre
; North Atlantic Oscillation
; paleoclimate
; reconstruction
; sea surface temperature
; thermohaline circulation
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The North Atlantic Ocean subpolar gyre (NA SPG) is an important region for initializing decadal climate forecasts. Climate model simulations and paleoclimate reconstructions have indicated that this region could also exhibit large, internally generated variability on decadal time scales. Understanding these modes of variability, their consistency across models, and the conditions in which they exist is clearly important for improving the skill of decadal predictions-particularly when these predictions are made with the same underlying climate models. This study describes and analyzes a mode of internal variability in the NA SPG in a state-of-the-art, high-resolution, coupled climate model. This mode has a period of 17 yr and explains 15%-30% of the annual variance in related ocean indices. It arises because of the advection of heat content anomalies around the NA SPG. Anomalous circulation drives the variability in the southern half of the NA SPG, while mean circulation and anomalous temperatures are important in the northern half. A negative feedback between Labrador Sea temperatures/densities and those in the North Atlantic Current (NAC) is identified, which allows for the phase reversal. The atmosphere is found to act as a positive feedback on this mode via the North Atlantic Oscillation (NAO), which itself exhibits a spectral peak at 17 yr. Decadal ocean density changes associated with this mode are driven by variations in temperature rather than salinity- a point which models often disagree on and which may affect the veracity of the underlying assumptions of anomaly-assimilating decadal prediction methodologies. © 2015 American Meteorological Society. 资助项目: NCAS, National Centre for Atmospheric Science
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50657
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Met Office Hadley Centre, Exeter, United Kingdom; NCAS-Climate, University of Reading, Reading, United Kingdom
Recommended Citation:
Menary M.B.,Hodson D.L.R.,Robson J.I.,et al. A mechanism of internal decadal Atlantic Ocean variability in a high-resolution coupled climate model[J]. Journal of Climate,2015-01-01,28(19)