A Mechanism for the Generation of a Warm SST Anomaly in the Western Equatorial Pacific: A Pathway Perspective

doi:10.1029/2023JC020119

IOCAS-IR > 海洋环流与波动重点实验室

	A Mechanism for the Generation of a Warm SST Anomaly in the Western Equatorial Pacific: A Pathway Perspective
	Gao, Chuan1,2 ; Zhang, Rong-Hua2,3,4
	2023-11-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	128 期号:11 页码:22
通讯作者	Zhang, Rong-Hua([email protected])
摘要	Processes leading to the onset and development of an El Nino event in the tropical Pacific remain elusive. Observed data and Ocean General Circulation Model (OGCM) simulations are used to reveal a well-defined pattern of sea surface temperature (SST) perturbations along the mean North Equatorial Countercurrent (NECC) pathways in association with the onset and evolution of some El Nino events. The OGCM-based sensitivity experiments are conducted to illustrate how a warm SST anomaly (SSTA) on the equator can result from a thermal forcing that is prescribed north of 10 degrees N, similar to observed SST anomalies in December 1988. Within approximately one year, the imposed SST anomaly north of 10 degrees N tends to be transported to the dateline region on the equator by the mean ocean circulation in the western Pacific (the low-latitude western boundary current and the NECC). In due course, an upper-layer ocean warming is generated off the equator at 6-10 degrees N and then on the equator, which acts to induce a westerly wind anomaly response; a simple statistical atmospheric wind stress model is then used to depict an expected westerly wind response. These resultant SST and surface wind perturbations can couple together over the western tropical Pacific, forming air-sea interactions and setting up a stage for El Nino onset. As such, this pathway mechanism can reasonably well explain the first appearance of a warm SST anomaly on the equator in the dateline region and the corresponding development of westerly wind anomalies over the western Pacific in association with El Nino onset.
关键词	El Nino onset NECC pathways SST anomaly generation wind response ocean modeling
DOI	10.1029/2023JC020119
收录类别	SCI
语种	英语
资助项目	The authors wish to thank the anonymous reviewers for their comments and suggestions that helped to improve the original manuscript. This work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS; XDB42000000), th[XDB42000000]; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[42176032]; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[42030410]; Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)[LSKJ202202402]; National Natural Science Foundation of China[XDB40000000]; Strategic Priority Research Program of CAS
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001098889700001
出版者	AMER GEOPHYSICAL UNION
WOS关键词	EL-NINO ; COUPLED MODEL ; OCEAN ; ENSO ; CIRCULATION ; SIMULATION ; VARIABILITY ; PREDICTIONS ; PROGRESS ; LAYER
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/183892
专题	海洋环流与波动重点实验室
通讯作者	Zhang, Rong-Hua
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Laoshan Lab, Qingdao, Peoples R China 3.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Gao, Chuan,Zhang, Rong-Hua. A Mechanism for the Generation of a Warm SST Anomaly in the Western Equatorial Pacific: A Pathway Perspective[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2023,128(11):22.
APA	Gao, Chuan,&Zhang, Rong-Hua.(2023).A Mechanism for the Generation of a Warm SST Anomaly in the Western Equatorial Pacific: A Pathway Perspective.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,128(11),22.
MLA	Gao, Chuan,et al."A Mechanism for the Generation of a Warm SST Anomaly in the Western Equatorial Pacific: A Pathway Perspective".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 128.11(2023):22.

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