IOCAS-IR  > 海洋环流与波动重点实验室
The Observed Agulhas Retroflection Behaviors During 1993-2018
Zhu, Yanan1,2,3; Li, Yuanlong1,2,3,4; Zhang, Zhengguang3,5; Qiu, Bo6; Wang, Fan1,2,3
2021-12-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume126Issue:12Pages:16
Corresponding AuthorLi, Yuanlong(liyuanlong@qdio.ac.cn) ; Wang, Fan(fwang@qdio.ac.cn)
AbstractNear the southern tip of the African continent, the Agulhas Current retroflects eastward to feed the Agulhas Return Current, giving rise to the Agulhas Retroflection (AR). The AR is dynamically unstable and radiates eddies and rings that constitute a portion of the Agulhas leakage. In this study, by analyzing 26 years (1993-2018) of updated satellite altimetry data, the spatial and temporal characteristic of the surface AR point are revisited. By adopting a refined identification algorithm of the AR point, we show that the AR longitude (X-AR) fluctuates widely between 7 degrees and 27 degrees E on timescales ranging from days to months, without a stable seasonal cycle. The X-AR variability also shows evident temporal asymmetry with shorter residence time at western positions. The retreat of the AR from the western to eastern positions tends to be swift, with 46% of the events completed in one day. In comparison, the intrusion from the eastern to western positions is much slower, with 32% of the events taking more than one month. The energy transfer from the mean flow to mesoscale eddies is likely the primary regime underlying the AR variability. Further analysis suggests that the AR variability causes sea surface temperature anomalies of similar to 0.5 degrees C through anomalous advection and thereby gives rise to turbulent heat flux anomalies of similar to 10 W m(-2), exerting potential impacts on the local climate.
KeywordSouthern Indian Ocean Agulhas Current Agulhas Retroflection eddy-mean flow interaction
DOI10.1029/2021JC017995
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2019YFA0606702] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB40000000] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42010403] ; National Natural Science Foundation of China[42022041] ; National Natural Science Foundation of China[41876001] ; National Natural Science Foundation of China[42176008] ; National Natural Science Foundation of China[42176034] ; Shandong Provincial Natural Science Foundation[ZR2020JQ17] ; Key Deployment Project of CAS Centre for Ocean Mega-Science[COMS2019Q07]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000735870300036
PublisherAMER GEOPHYSICAL UNION
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Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/177657
Collection海洋环流与波动重点实验室
Corresponding AuthorLi, Yuanlong; Wang, Fan
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol Qingdao, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China
4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian, Peoples R China
5.Ocean Univ China, Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Phys Oceanog Lab, Qingdao, Peoples R China
6.Univ Hawaii Manoa, Dept Oceanog, Honolulu, HI 96822 USA
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhu, Yanan,Li, Yuanlong,Zhang, Zhengguang,et al. The Observed Agulhas Retroflection Behaviors During 1993-2018[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2021,126(12):16.
APA Zhu, Yanan,Li, Yuanlong,Zhang, Zhengguang,Qiu, Bo,&Wang, Fan.(2021).The Observed Agulhas Retroflection Behaviors During 1993-2018.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(12),16.
MLA Zhu, Yanan,et al."The Observed Agulhas Retroflection Behaviors During 1993-2018".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.12(2021):16.
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