气候变化领域集成服务门户(CCPortal): Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater

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DOI	10.1038/s41586-023-05762-w
	Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater
	Li, Qian; England, Matthew H.; Hogg, Andrew McC.; Rintoul, Stephen R.; Morrison, Adele K.
发表日期	2023
ISSN	0028-0836
EISSN	1476-4687
起始页码	841
结束页码	+
卷号	615 期号:7954
英文摘要	The abyssal ocean circulation is a key component of the global meridional overturning circulation, cycling heat, carbon, oxygen and nutrients throughout the world ocean(1,2). The strongest historical trend observed in the abyssal ocean is warming at high southern latitudes(2-4), yet it is unclear what processes have driven this warming, and whether this warming is linked to a slowdown in the ocean's overturning circulation. Furthermore, attributing change to specific drivers is difficult owing to limited measurements, and because coupled climate models exhibit biases in the region(5-7). In addition, future change remains uncertain, with the latest coordinated climate model projections not accounting for dynamic ice-sheet melt. Here we use a transient forced high-resolution coupled ocean-sea-ice model to show that under a high-emissions scenario, abyssal warming is set to accelerate over the next 30 years. We find that meltwater input around Antarctica drives a contraction of Antarctic Bottom Water (AABW), opening a pathway that allows warm Circumpolar Deep Water greater access to the continental shelf. The reduction in AABW formation results in warming and ageing of the abyssal ocean, consistent with recent measurements. In contrast, projected wind and thermal forcing has little impact on the properties, age and volume of AABW. These results highlight the critical importance of Antarctic meltwater in setting the abyssal ocean overturning, with implications for global ocean biogeochemistry and climate that could last for centuries.
语种	英语
WOS研究方向	Multidisciplinary Sciences
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000991384600002
来源期刊	NATURE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/281228
作者单位	Massachusetts Institute of Technology (MIT); University of New South Wales Sydney; University of New South Wales Sydney; Australian National University; Australian National University; Commonwealth Scientific & Industrial Research Organisation (CSIRO); University of Tasmania; Australian National University; Australian National University
推荐引用方式 GB/T 7714	Li, Qian,England, Matthew H.,Hogg, Andrew McC.,et al. Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater[J],2023,615(7954).
APA	Li, Qian,England, Matthew H.,Hogg, Andrew McC.,Rintoul, Stephen R.,&Morrison, Adele K..(2023).Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater.NATURE,615(7954).
MLA	Li, Qian,et al."Abyssal ocean overturning slowdown and warming driven by Antarctic meltwater".NATURE 615.7954(2023).