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Variability of the Sub-Antarctic Mode Water Subduction Rate During the Argo Period
Qu, Tangdong1; Gao, Shan2,3,4; Fine, Rana A.5
2020-07-16
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume47Issue:13Pages:10
AbstractBoth 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.
DOI10.1029/2020GL088248
Indexed BySCI
Language英语
Funding ProjectNSF[1829809] ; NSF[1829824] ; National Natural Science Foundation of China[41676009]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000551465400007
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/168045
Collection中国科学院海洋研究所
Corresponding AuthorQu, Tangdong
Affiliation1.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
Recommended Citation
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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