Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage

doi:10.1029/2021JC017899

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage
	Zhou, Li 1,6; Wang, Qiang 4,5; Mu, Mu 1,3; Zhang, Kun 1,2
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2021-12-01
卷号	126 期号:12 页码:19
关键词	Antarctic Circumpolar Current optimal precursors short-range prediction baroclinic instability CNOP
ISSN号	2169-9275
DOI	10.1029/2021JC017899
通讯作者	Wang, Qiang(wangq@hhu.edu.cn)
英文摘要	Due to the high nonlinearity, the accurate prediction of the Antarctic circumpolar current (ACC) transport is still challenging. Using the eddy-permitting regional ocean modeling system and the conditional nonlinear optimal perturbation approach, the sudden shift in the ACC transport through Drake Passage (DP) is investigated by exploring its optimal precursor (OPR). Here, the sudden shift in the ACC transport is defined as a fluctuation exceeding double STD (similar to 16 Sv; 1 Sv = 10(6) m(3) s(-1)) within 30 days. The results indicate that the OPRs for all three cases exhibit specific structures in the middle DP (58 degrees-62 degrees S, 72 degrees-64 degrees W) at the depth of 1,000-3,000 m, implying that the ACC transport is most sensitive to the initial perturbations there. The OPRs' evolutions show similar features: the OPR for each case triggers an eddy-like dipole perturbation with a northern cyclone and a southern anticyclone, leading to a sudden reduction in the ACC transport of similar to 40 Sv. It is verified that the density components in the OPRs determine such evolution processes. Furthermore, baroclinic instability is diagnosed to play a dominant role in the development of OPRs by analyzing the perturbed kinetic energy budget. This study suggests that the deep-layer density perturbations in the Southern Ocean should be carefully monitored when considering the short-range prediction of the ACC transport.
资助项目	Fundamental Research Funds for the Central Universities[B200201011] ; National Natural Science Foundation of China[41806013] ; National Natural Science Foundation of China[41576015] ; High Performance Computing Center at the Institute of Oceanology, Chinese Academy of Sciences
WOS研究方向	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000735870300035
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177686]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Wang, Qiang
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 3.Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China 4.Hohai Univ, Coll Oceanog, Nanjing, Peoples R China 5.Hohai Univ, Minist Nat Resources, Key Lab Marine Hazards Forecasting, Nanjing, Peoples R China 6.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Li,Wang, Qiang,Mu, Mu,et al. Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2021,126(12):19.
APA	Zhou, Li,Wang, Qiang,Mu, Mu,&Zhang, Kun.(2021).Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(12),19.
MLA	Zhou, Li,et al."Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.12(2021):19.