气候变化领域集成服务门户(CCPortal): Global heat balance and heat uptake in potential temperature coordinates

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DOI	10.1007/s00382-021-05832-7
	Global heat balance and heat uptake in potential temperature coordinates
	Hochet A.; Tailleux R.; Kuhlbrodt T.; Ferreira D.
发表日期	2021
ISSN	0930-7575
英文摘要	The representation of ocean heat uptake in Simple Climate Models used for policy advice on climate change mitigation strategies is often based on variants of the one-dimensional Vertical Advection/Diffusion equation (VAD) for some averaged form of potential temperature. In such models, the effective advection and turbulent diffusion are usually tuned to emulate the behaviour of a given target climate model. However, because the statistical nature of such a “behavioural” calibration usually obscures the exact dependence of the effective diffusion and advection on the actual physical processes responsible for ocean heat uptake, it is difficult to understand its limitations and how to go about improving VADs. This paper proposes a physical calibration of the VAD that aims to provide explicit traceability of effective diffusion and advection to the processes responsible for ocean heat uptake. This construction relies on the coarse-graining of the full three-dimensional advection diffusion for potential temperature using potential temperature coordinates. The main advantage of this formulation is that the temporal evolution of the reference temperature profile is entirely due to the competition between effective diffusivity that is always positive definite, and the water mass transformation taking place at the surface, as in classical water mass analyses literature. These quantities are evaluated in numerical simulations of present day climate and global warming experiments. In this framework, the heat uptake in the global warming experiment is attributed to the increase of surface heat flux at low latitudes, its decrease at high latitudes and to the redistribution of heat toward cold temperatures made by diffusive flux. © 2021, The Author(s).
英文关键词	Heat uptake; Simple Climate Model
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183421
作者单位	CNRS, Ifremer, IRD, Laboratoire d’Océanographie Physique et Spatiale (LOPS, UMR 6523), Univ of Brest, IUEM, Brest, France; Department of Meteorology, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Hochet A.,Tailleux R.,Kuhlbrodt T.,et al. Global heat balance and heat uptake in potential temperature coordinates[J],2021.
APA	Hochet A.,Tailleux R.,Kuhlbrodt T.,&Ferreira D..(2021).Global heat balance and heat uptake in potential temperature coordinates.Climate Dynamics.
MLA	Hochet A.,et al."Global heat balance and heat uptake in potential temperature coordinates".Climate Dynamics (2021).