Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
| Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis | |
Wang, Jin1,2 ; Liu, Chuanyu1,3,4; Wang, Xiaowei1,3,4; Koehl, Armin5; Lyu, Yilong1,3; Li, Yuanlong1,3,4; Wang, Fan1,2,3,4
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| 2022-06-09 | |
| Source Publication | FRONTIERS IN MARINE SCIENCE
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| Volume | 9Pages:18 |
| Corresponding Author | Liu, Chuanyu(chuanyu.liu@qdio.ac.cn) |
| Abstract | The maintenance and variation of the Pacific Equatorial Undercurrent (EUC) are thought to be controlled by the zonal pressure gradient force (ZPGF). However, a recent study found that a large-scale circulation associated with Rossby waves can also lead to EUC variation, implying that the structures and timing of the influential winds and the underlying wind-driven mechanisms need to be revisited. Here, we use the adjoint-sensitivity method to obtain the crucial winds that can most efficiently influence EUC variations. The obtained adjoint sensitivities (denoting the sensitive winds) are confined to 15 degrees S-15 degrees N and exhibit a funnel-shaped pattern with high symmetry about the equator. The remote winds, which occur 4 to 11 months prior, can lead to EUC variations at the basin scale; in contrast, the near-term winds (occurring not earlier than 4 months) lead only to local EUC variations. Accordingly, we find that wind-initiated equatorial Kelvin waves, equatorial Rossby waves, and the reflected waves at both the western and eastern boundaries superimpose onto each other to result in EUC variations. Specifically, when the travel time is longer than 4 months, the waves can form a negative-positive-negative sea surface height anomaly (SSHA) pattern between 15 degrees S and 15 degrees N in the central-eastern tropical Pacific, indicating the joint effect of both types of waves; they also form a positive SSHA in the western equatorial Pacific, indicating the dominance of the Kelvin wave therein. These mechanisms are complementary to the canonical ZPGF mechanism, which provide a clear theoretical basis for EUC variation studies. |
| Keyword | Equatorial Undercurrent adjoint sensitivity analysis equatorial Rossby wave Kelvin wave wind-driven |
| DOI | 10.3389/fmars.2022.908939 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Strategic Priority Research Program of Chinese Academy of Sciences (CAS)[XDA19060102] ; Strategic Priority Research Program of Chinese Academy of Sciences (CAS)[XDB42000000] ; National Natural Science Foundation of China[41976012] ; National Natural Science Foundation of China[41606026] ; National Natural Science Foundation of China[41730534] ; Key Research Program of Frontier Sciences of CAS[QYZDB-SSW-DQC030] |
| WOS Research Area | Environmental Sciences & Ecology ; Marine & Freshwater Biology |
| WOS Subject | Environmental Sciences ; Marine & Freshwater Biology |
| WOS ID | WOS:000814895100001 |
| Publisher | FRONTIERS MEDIA SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/179152 |
| Collection | 海洋环流与波动重点实验室 |
| Corresponding Author | Liu, Chuanyu |
| Affiliation | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 4.Marine Dynam Proc & Climate Funct Lab, Pilot Natl Lab Marine Sci & Technol Qingdao QNLM, Qingdao, Peoples R China 5.Univ Hamburg, Inst Oceanog ifm, Ctr Earth Syst Res & Sustainabil CEN, Hamburg, Germany |
| First Author Affilication | Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences |
| Corresponding Author Affilication | Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Wang, Jin,Liu, Chuanyu,Wang, Xiaowei,et al. Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis[J]. FRONTIERS IN MARINE SCIENCE,2022,9:18. |
| APA | Wang, Jin.,Liu, Chuanyu.,Wang, Xiaowei.,Koehl, Armin.,Lyu, Yilong.,...&Wang, Fan.(2022).Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis.FRONTIERS IN MARINE SCIENCE,9,18. |
| MLA | Wang, Jin,et al."Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis".FRONTIERS IN MARINE SCIENCE 9(2022):18. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| fmars-09-908939.pdf（19042KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | View | |
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