Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
| Optimal Precursors Triggering Sudden Shifts in the Antarctic Circumpolar Current Transport Through Drake Passage | |
Zhou, Li1,2; Wang, Qiang3,4; Mu, Mu1,5; Zhang, Kun1,6
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| 2021-12-01 | |
| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| ISSN | 2169-9275 |
| 卷号 | 126期号:12页码:19 |
| 通讯作者 | Wang, Qiang(wangq@hhu.edu.cn) |
| 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. |
| 关键词 | Antarctic Circumpolar Current optimal precursors short-range prediction baroclinic instability CNOP |
| DOI | 10.1029/2021JC017899 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 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 |
| WOS类目 | Oceanography |
| WOS记录号 | WOS:000735870300035 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/177687 |
| 专题 | 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.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Hohai Univ, Minist Nat Resources, Key Lab Marine Hazards Forecasting, Nanjing, Peoples R China 4.Hohai Univ, Coll Oceanog, Nanjing, Peoples R China 5.Fudan Univ, Inst Atmospher Sci, Shanghai, Peoples R China 6.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 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. |
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| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| JGR Oceans - 2021 - （4661KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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