DOI: 10.1175/JCLI-D-13-00016.1
Scopus记录号: 2-s2.0-84892541129
论文题名: The deep ocean buoyancy budget and its temporal variability
作者: Palter J.B. ; Griffies S.M. ; Samuels B.L. ; Galbraith E.D. ; Gnanadesikan A. ; Klocker A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 2 起始页码: 551
结束页码: 573
语种: 英语
Scopus关键词: Atmospheric carbon dioxide concentration
; Buoyancy forcing
; Decadal timescale
; Earth system model
; Interannual variability
; Large-scale advection
; Meridional overturning circulations
; Temporal variability
; Atmospheric chemistry
; Budget control
; Carbon dioxide
; Equations of state
; Sea level
; Slow light
; Stream flow
; Buoyancy
; advection
; advection-diffusion equation
; air-sea interaction
; annual variation
; atmospheric chemistry
; buoyancy
; buoyancy forcing
; carbon cycle
; carbon dioxide
; concentration (composition)
; convection
; decadal variation
; latitudinal gradient
; pycnocline
; turbulent mixing
英文摘要: Despite slow rates of ocean mixing, observational and modeling studies suggest that buoyancy is redistributed to all depths of the ocean on surprisingly short interannual to decadal time scales. The mechanisms responsible for this redistribution remain poorly understood. This work uses an Earth system model to evaluate the global steady-state ocean buoyancy (and related steric sea level) budget, its interannual variability, and its transient response to a doubling of CO2 over 70 years, with a focus on the deep ocean. At steady state, the simple view of vertical advective-diffusive balance for the deep ocean holds at low tomidlatitudes. At higher latitudes, the balance depends on a myriad of additional terms, namely mesoscale and submesoscale advection, convection and overflows from marginal seas, and terms related to the nonlinear equation of state. These high-latitude processes rapidly communicate anomalies in surface buoyancy forcing to the deep ocean locally; the deep, high-latitude changes then influence the large-scale advection of buoyancy to create transient deep buoyancy anomalies at lower latitudes. Following a doubling of atmospheric carbon dioxide concentrations, the high-latitude buoyancy sinks are suppressed by a slowdown in convection and reduced dense water formation. This change is accompanied by a slowing of both upper and lower cells of the global meridional overturning circulation, reducing the supply of dense water to low latitudes beneath the pycnocline and the commensurate flow of light waters to high latitudes above the pycnocline. By thismechanism, changes in high-latitude buoyancy are communicated to the global deep ocean on relatively fast advective time scales. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51029
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric and Oceanic Sciences Department, McGill University, Montreal, QC, Canada; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada; Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, United States; Research School of Earth Sciences, Australia National University, Australian Capital Territory, ACT, Australia
Recommended Citation:
Palter J.B.,Griffies S.M.,Samuels B.L.,et al. The deep ocean buoyancy budget and its temporal variability[J]. Journal of Climate,2014-01-01,27(2)