气候变化领域集成服务门户(CCPortal): Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin

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DOI	10.1038/s41558-023-01667-8
	Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin
	Gunn, Kathryn L.; Rintoul, Stephen R.; England, Matthew H.; Bowen, Melissa M.
发表日期	2023
ISSN	1758-678X
EISSN	1758-6798
起始页码	537
结束页码	+
卷号	13 期号:6
英文摘要	Antarctic bottom water (AABW), a key component of ocean circulation, provides oxygen to the deep ocean. This work shows that AABW transport reduced over the past decades in the Australian Antarctic Basin, weakening the abyssal overturning circulation and decreasing deep ocean oxygen. Dense water formed near Antarctica, known as Antarctic bottom water (AABW), drives deep ocean circulation and supplies oxygen to the abyssal ocean. Observations show that AABW has freshened and contracted since the 1960s, yet the drivers of these changes and their impact remain uncertain. Here, using observations from the Australian Antarctic Basin, we show that AABW transport reduced by 4.0 Sv between 1994 and 2009, during a period of strong freshening on the continental shelf. An increase in shelf water salinity between 2009 and 2018, previously linked to transient climate variability, drove a partial recovery (2.2 Sv) of AABW transport. Over the full period (1994 to 2017), the net slowdown of -0.8 +/- 0.5 Sv decade(-1) thinned well-oxygenated layers, driving deoxygenation of -3 +/- 2 mu mol kg(-1) decade(-1). These findings demonstrate that freshening of Antarctic shelf waters weakens the lower limb of the abyssal overturning circulation and reduces deep ocean oxygen content.
英文关键词	BOTTOM WATER; ADELIE LAND; ROSS SEA; VARIABILITY; TRANSPORT; SLOWDOWN; DENSITY; FLOW
WOS研究方向	Environmental Sciences ; Environmental Studies ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000995255800005
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282202
作者单位	NERC National Oceanography Centre; University of Southampton; University of Tasmania; University of New South Wales Sydney; University of New South Wales Sydney; University of Auckland
推荐引用方式 GB/T 7714	Gunn, Kathryn L.,Rintoul, Stephen R.,England, Matthew H.,et al. Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin[J],2023,13(6).
APA	Gunn, Kathryn L.,Rintoul, Stephen R.,England, Matthew H.,&Bowen, Melissa M..(2023).Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin.Nature Climate Change,13(6).
MLA	Gunn, Kathryn L.,et al."Recent reduced abyssal overturning and ventilation in the Australian Antarctic Basin".Nature Climate Change 13.6(2023).