Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period

doi:10.1029/2020GL088248

IOCAS-IR

	Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period
	Qu, Tangdong 1; Gao, Shan 2,3,4; Fine, Rana A.5
	2020-07-16
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
卷号	47 期号:13 页码:10
摘要	Both a quasi-biennial variability and an overall linearly increasing trend are identified in the Sub-Antarctic Mode Water (SAMW) subduction rate across the Southern Hemisphere ocean, using the Argo data during 2005-2019. The quasi-biennial variability is mainly due to variability of the mixed layer depth. Variability of wind stress curl in the SAMW formation regions associated with the Southern Annular Mode plays a critical role in generating the quasi-biennial variability of the mixed layer depth and consequently the SAMW subduction rates. The SAMW subduction rate across the Southern Hemisphere ocean, long-term mean totaling 56 Sv, has increased at 0.73 +/- 0.65 Sv year(-1) over the past 15 years. The increase has directly contributed to the observed increase in the total SAMW volume. Much of this increasing trend can be explained by the deepening mixed layers, which in turn are primarily forced by the strengthening westerly winds under an increasing Southern Annular Mode. Plain Language Summary The upper ocean heat content has increased globally during the past decades. Recent studies have shown that this warming trend has concentrated in the extratropical Southern Hemisphere ocean and can be largely explained by the Sub-Antarctic Mode Water (SAMW) variability. Analysis of the Argo data reveals an increasing trend of the SAMW subduction rate during the period 2005-2019. Superimposed with this increasing trend is a quasi-biennial variability resulting from changes of the mixed layer depth. The increasing trend of the SAMW subduction rate directly contributes to the decade-long increase of the total SAMW volume. A large portion of this increasing trend is due to deepening of the mixed layer. Enhanced downward Ekman pumping in the SAMW subduction regions associated with an increasing Southern Annular Mode is primarily responsible for the increasing trends of the mixed layer depth and consequently the SAMW subduction rate.
DOI	10.1029/2020GL088248
收录类别	SCI
语种	英语
资助项目	NSF[1829809]; NSF[1829824]; National Natural Science Foundation of China[41676009]
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000551465400007
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：29[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.qdio.ac.cn/handle/337002/168045
专题	中国科学院海洋研究所
通讯作者	Qu, Tangdong
作者单位	1.Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA 90095 USA 2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 4.Pilot Natl Lab Marine Sci & Technol, Lab Ocean Dynam & Climate, Qingdao, Peoples R China 5.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA
推荐引用方式 GB/T 7714	Qu, Tangdong,Gao, Shan,Fine, Rana A.. Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(13):10.
APA	Qu, Tangdong,Gao, Shan,&Fine, Rana A..(2020).Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period.GEOPHYSICAL RESEARCH LETTERS,47(13),10.
MLA	Qu, Tangdong,et al."Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period".GEOPHYSICAL RESEARCH LETTERS 47.13(2020):10.

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