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, Yuanlong1,2,3; Wang, Jianing1,2,3; Duan, Jing1,2,3; Tang, Xiaohui1,2,3; Liu, Chuanyu1,2,3; Zhang, Linlin1,2,3; Ma, Qiang1,2,3; Wang, Fan1,2,3,4
2020-11-01
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN0022-3670
Volume50Issue:11Pages:3353-3373
Corresponding AuthorWang, Fan(fwang@qdio.ac.cn)
AbstractMooring 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.
KeywordOcean circulation Atmosphere-ocean interaction ENSO Warm pool Interannual variability
DOI10.1175/JPO-D-20-0011.1
Indexed BySCI
Language英语
Funding ProjectStrategic 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 Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000655507200014
PublisherAMER METEOROLOGICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/176775
Collection海洋环流与波动重点实验室
Corresponding AuthorWang, Fan
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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.
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