DOI: 10.1016/j.epsl.2021.117033
论文题名: A hemispheric asymmetry in poleward ocean heat transport across climates: Implications for overturning and polar warming
作者: Newsom E.R. ; Thompson A.F. ; Adkins J.F. ; Galbraith E.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 568 语种: 英语
中文关键词: climate evolution
; climate modeling
; Last Glacial Maximum
; ocean heat transport
; ocean overturning circulation
; paleoclimate
英文关键词: Carbon dioxide
; Climate models
; Glacial geology
; Heat losses
; Heat transfer
; Climate evolution
; Climate modeling
; Climate state
; Deep-water formation
; High Latitudes
; Last Glacial Maximum
; Ocean heat transport
; Ocean overturning circulation
; Pacific ocean
; Paleoclimates
; Oceanography
英文摘要: The modern Indo-Pacific oceans absorb more heat from the atmosphere than they release. The resulting energy surplus is exported from the Indo-Pacific by the ocean circulation and lost to the atmosphere from other ocean basins. This heat transport ultimately sustains much of the buoyancy lost to deep water formation at high latitudes, a key component of the global overturning circulation. Despite the fundamental link between inter-basin ocean heat transport and global overturning in today's climate, there is no general understanding of how these phenomena vary with climate state. Here, we use an unprecedented suite of fully-coupled climate model simulations, equilibrated for thousands of years to a wide range of CO2 levels, to demonstrate that major differences in overturning between climates are related to systematic shifts in ocean heat transport between basins. Uniformly, equilibration to higher CO2 levels strengthens inter-basin ocean heat transport and global deep water formation. These changes are sustained by increased surface heat uptake within the Indo-Pacific oceans, and increased high-latitude heat loss outside of the Indo-Pacific oceans as the climate warms. However, poleward heat transport and high-latitude heat loss do not increase symmetrically between hemispheres. Between glacial and modern-like states, North Atlantic heat loss intensifies and overturning in the Atlantic strengthens. In contrast, between modern-like and hot climates, heat loss and overturning strengthens in the Southern Ocean. We propose that these differences are linked to a shift in the relative efficiency of northward and southward ocean heat transport — dominated by advection in the North Atlantic and eddy diffusion in the Southern Ocean — with climate state. Our results suggest that, under high CO2, future ocean heat transport towards Antarctica would increase disproportionately compared to its changes since the last ice age. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165616
Appears in Collections: 气候变化与战略
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作者单位: Department of Physics, University of Oxford, United Kingdom; Division of Geological and Planetary Sciences, Caltech, United States; Earth and Planetary Science, McGill University, Canada
Recommended Citation:
Newsom E.R.,Thompson A.F.,Adkins J.F.,et al. A hemispheric asymmetry in poleward ocean heat transport across climates: Implications for overturning and polar warming[J]. Earth and Planetary Science Letters,2021-01-01,568