气候变化领域集成服务门户(CCPortal): On the superposition of mean advective and eddy-induced transports in global ocean heat and salt budgets

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DOI	10.1175/JCLI-D-19-0418.1
	On the superposition of mean advective and eddy-induced transports in global ocean heat and salt budgets
	Dias F.B.; Domingues C.M.; Marsland S.J.; Griffies S.M.; Rintoul S.R.; Matear R.; Fiedler R.
发表日期	2020
ISSN	0894-8755
起始页码	1121
结束页码	1140
卷号	33 期号:3
英文摘要	Ocean thermal expansion is a large contributor to observed sea level rise, which is expected to continue into the future. However, large uncertainties exist in sea level projections among climate models, partially due to intermodel differences in ocean heat uptake and redistribution of buoyancy. Here, the mechanisms of vertical ocean heat and salt transport are investigated in quasi-steady-state model simulations using the Australian Community Climate and Earth-System Simulator Ocean Model (ACCESS-OM2). New insights into the net effect of key physical processes are gained within the superresidual transport (SRT) framework. In this framework, vertical tracer transport is dominated by downward fluxes associated with the large-scale ocean circulation and upward fluxes induced by mesoscale eddies, with two distinct physical regimes. In the upper ocean, where high-latitude water masses are formed by mixed layer processes, through cooling or salinification, the SRT counteracts those processes by transporting heat and salt downward. In contrast, in the ocean interior, the SRT opposes dianeutral diffusion via upward fluxes of heat and salt, with about 60% of the vertical heat transport occurring in the Southern Ocean. Overall, the SRT is largely responsible for removing newly formed water masses from the mixed layer into the ocean interior, where they are eroded by dianeutral diffusion. Unlike the classical advective-diffusive balance, dianeutral diffusion is bottom intensified above rough bottom topography, allowing an overturning cell to develop in alignment with recent theories. Implications are discussed for understanding the role of vertical tracer transport on the simulation of ocean climate and sea level. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Budget control; Diffusion; Earth (planet); Sea level; Thermal expansion; Topography; Bottom topography; Heat transport; Large-scale ocean circulations; Ocean heat uptake; Physical process; Quasi-steady-state models; Salt transport; Tracer transport; Climate models; advection; advection-diffusion equation; air-sea interaction; atmospheric transport; bottom topography; climate modeling; computer simulation; eddy; heat transfer; marine atmosphere; mesoscale eddy; oceanic circulation; sea level; thermal expansion; uncertainty analysis; Southern Ocean
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171463
作者单位	Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia; CSIRO Oceans and Atmosphere, Aspendale, VIC, Australia; ARC Centre of Excellence for Climate Extremes, University of Tasmania, Hobart, TAS, Australia; Antarctic Climate and Ecosystem Cooperative Research Centre, Hobart, TAS, Australia; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Program in Atmospheric and Ocean Sciences, Princeton University, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Dias F.B.,Domingues C.M.,Marsland S.J.,et al. On the superposition of mean advective and eddy-induced transports in global ocean heat and salt budgets[J],2020,33(3).
APA	Dias F.B..,Domingues C.M..,Marsland S.J..,Griffies S.M..,Rintoul S.R..,...&Fiedler R..(2020).On the superposition of mean advective and eddy-induced transports in global ocean heat and salt budgets.Journal of Climate,33(3).
MLA	Dias F.B.,et al."On the superposition of mean advective and eddy-induced transports in global ocean heat and salt budgets".Journal of Climate 33.3(2020).