Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events

doi:10.1175/JPO-D-20-0011.1

IOCAS-IR > 海洋环流与波动重点实验室

	Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events
	Lyu, Yilong1,2,3 ; Li, Yuanlong 1,2,3; Wang, Jianing1,2,3 ; Duan, Jing 1,2,3; Tang, Xiaohui 1,2,3; Liu, Chuanyu 1,2,3; Zhang, Linlin 1,2,3; Ma, Qiang1,2,3 ; Wang, Fan1,2,3,4
	2020-11-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	50 期号:11 页码:3353-3373
通讯作者	Wang, Fan([email protected])
摘要	Mooring measurements at similar to 140 degrees E in the western equatorial Pacific Ocean documented greatly intensified eastward subsurface currents, which largely represent the nascent Equatorial Undercurrent, to similar to 67 cm s(-1) in boreal summer of 2016. The eastward currents occupied the entire upper 500m while the westward surface currents nearly disappeared. Historical in situ data observed similar variations after most El Nino events. Further analysis combining satellite and reanalysis data reveals that the eastward currents observed at similar to 140 degrees E are a component of an anomalous counter-clockwise circulation straddling the equator, with westward current anomalies retroflecting near the western boundary and feeding southeastward current anomalies along the New Guinea coast. A 1.5-layer reduced-gravity ocean model is able to crudely reproduce these variations, and a hierarchy of sensitivity experiments is performed to understand the underlying dynamics. The anomalous circulation is largely the delayed ocean response to equatorial wind anomalies over the centralto-eastern Pacific basin emerging in the mature stage of El Nino. Downwelling Rossby waves are generated by the reflection of equatorial Kelvin waves and easterly winds in the eastern Pacific. Upon reaching the western Pacific, the southern lobes of Rossby waves encounter the slanted New Guinea island and deflect to the equator, establishing a local sea surface height maximum and leading to the detour of westward currents flowing from the Pacific interior. Additional experiments with edited western boundary geometry confirm the importance of topography in regulating the structure of this cross-equatorial anomalous circulation.
关键词	Ocean circulation Atmosphere-ocean interaction ENSO Warm pool Interannual variability
DOI	10.1175/JPO-D-20-0011.1
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000]; National Natural Science Foundation of China[41730534]; National Program on Global Change and Air-Sea Interaction[GASI-IPOVAI-01-01]; Key Research Program of Frontier Sciences, CAS[QYZDB-SSW-SYS034]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000655507200014
出版者	AMER METEOROLOGICAL SOC
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/337002/176775
专题	海洋环流与波动重点实验室
通讯作者	Wang, Fan
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol Qingdao, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Lyu, Yilong,Li, Yuanlong,Wang, Jianing,et al. Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2020,50(11):3353-3373.
APA	Lyu, Yilong.,Li, Yuanlong.,Wang, Jianing.,Duan, Jing.,Tang, Xiaohui.,...&Wang, Fan.(2020).Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events.JOURNAL OF PHYSICAL OCEANOGRAPHY,50(11),3353-3373.
MLA	Lyu, Yilong,et al."Anomalous Upper-Ocean Circulation of the Western Equatorial Pacific following El Nino Events".JOURNAL OF PHYSICAL OCEANOGRAPHY 50.11(2020):3353-3373.