DOI: 10.1175/JCLI-D-15-0097.1
Scopus记录号: 2-s2.0-84957638967
论文题名: Mechanisms of heat content and thermocline change in the subtropical and subpolar North Atlantic
作者: Williams R.G. ; Roussenov V. ; Lozier M.S. ; Smith D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 24 起始页码: 9803
结束页码: 9815
语种: 英语
Scopus关键词: Atmospheric temperature
; Catchments
; Climate models
; Enthalpy
; Stream flow
; Surface waters
; Temperature distribution
; Tropics
; Ekman pumping/transport
; Geographic location
; Gyres
; Meridional overturning circulations
; North Atlantic Ocean
; Thermocline circulation
; Oceanography
; annual variation
; atmospheric forcing
; climate change
; decadal variation
; heat flux
; meridional circulation
; sea surface temperature
; subtropical region
; thermocline
; warming
; Atlantic Ocean
; Atlantic Ocean (North)
; Labrador Sea
英文摘要: In the North Atlantic, there are pronounced gyre-scale changes in ocean heat content on interannual-to-decadal time scales, which are associated with changes in both sea surface temperature and thermocline thickness; the subtropics are often warm with a thick thermocline when the subpolar gyre is cool with a thin thermocline, and vice versa. This climate variability is investigated using a semidiagnostic dynamical analysis of historical temperature and salinity data from 1962 to 2011 together with idealized isopycnic model experiments. On time scales of typically 5 yr, the tendencies in upper-ocean heat content are not simply explained by the area-averaged atmospheric forcing for each gyre but instead dominated by heat convergences associated with the meridional overturning circulation. In the subtropics, the most pronounced warming events are associated with an increased influx of tropical heat driven by stronger trade winds. In the subpolar gyre, the warming and cooling events are associated with changes in western boundary density, where increasing Labrador Sea density leads to an enhanced overturning and an influx of subtropical heat. Thus, upper-ocean heat content anomalies are formed in a different manner in the subtropical and subpolar gyres, with different components of the meridional overturning circulation probably excited by the local imprint of atmospheric forcing. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50548
Appears in Collections: 气候变化事实与影响
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作者单位: University of Liverpool, Liverpool, United Kingdom; Duke University, Durham, NC, United States; Met Office Hadley Centre, Exeter, United Kingdom
Recommended Citation:
Williams R.G.,Roussenov V.,Lozier M.S.,et al. Mechanisms of heat content and thermocline change in the subtropical and subpolar North Atlantic[J]. Journal of Climate,2015-01-01,28(24)