Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis

doi:10.3389/fmars.2022.908939

IOCAS-IR > 海洋环流与波动重点实验室

	Wind-Driven Mechanisms for the Variations of the Pacific Equatorial Undercurrent Based on Adjoint Sensitivity Analysis
	Wang, Jin1,2 ; Liu, Chuanyu 1,3,4; Wang, Xiaowei 1,3,4; Koehl, Armin 5; Lyu, Yilong1,3 ; Li, Yuanlong 1,3,4; Wang, Fan1,2,3,4
	2022-06-09
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	9 页码:18
通讯作者	Liu, Chuanyu(chuanyu.liu@qdio.ac.cn)
摘要	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.
关键词	Equatorial Undercurrent adjoint sensitivity analysis equatorial Rossby wave Kelvin wave wind-driven
DOI	10.3389/fmars.2022.908939
收录类别	SCI
语种	英语
资助项目	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研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:000814895100001
出版者	FRONTIERS MEDIA SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/179152
专题	海洋环流与波动重点实验室
通讯作者	Liu, Chuanyu
作者单位	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
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 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.

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