IOCAS-IR  > 海洋环流与波动重点实验室
Contrasting Intraseasonal Variations of the Equatorial Pacific Ocean Between the 1997-1998 and 2015-2016 El Nino Events
Lyu, Yilong1,2,3; Li, Yuanlong1,3,4; Tang, Xiaohui1,3,4; Wang, Fan1,2,3,4; Wang, Jianing1,3,4
2018-09-28
Source PublicationGEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
Volume45Issue:18Pages:9748-9756
Corresponding AuthorTang, Xiaohui(tangxiaohui@qdio.ac.cn)
AbstractOceanic intraseasonal variability (ISV) plays a vital role in the initiation and development of El Nino events. Mooring observations reveal contrasting characteristics of upper-ocean zonal current ISV during different El Nino events. Compared to the 1997-1998 event, ISV of the 2015-2016 event was significantly weaker (by around 30-50%) over the equatorial Pacific basin, and the variability maximum was shifted to the east (similar to 160 degrees E). These differences can be largely explained by wind forcing features. ISV of surface winds in 2015 is overall weaker than in 1997. Intraseasonal westerly wind bursts in 1997 occurred near the western boundary and originated from the Indian Ocean, whereas in 2015, perturbations were mainly propagated from the northeast Pacific and achieved the peak power at similar to 160 degrees E of the equator. These changes are likely associated with the decadal warming of the northeast subtropical Pacific and weakening of the Indian Ocean intraseasonal oscillation. Plain Language Summary Sea surface warmings of strong El Nino events are usually triggered by intraseasonal oscillations prior to the events. Particularly, intraseasonal eastward ocean currents generated by westerly wind bursts carry the warm water of the western Pacific warm pool to the central Pacific and contribute to the surface warming. In this paper, we compare the intraseasonal zonal current variations during two strong El Nino events, namely, the 1997-1998 and 2015-2016 events. Although the two El Nino events were of comparable strengths, intraseasonal variations in 1997 were stronger than those in 2015 by 3050%. These differences can be largely explained by the contrasting features of wind forcing. Intraseasonal oscillations were originated from the Indian Ocean in 1997, whereas those in 2015 were mainly from the northeast subtropical Pacific. The varying origin is likely associated with the warming of the northeast subtropical Pacific and weakened Indian Ocean intraseasonal oscillation during recent years.
Keywordintraseasonal variability El Nino ocean current equatorial Pacific Ocean WWE MJO
DOI10.1029/2018GL078915
Indexed BySCI
Language英语
Funding ProjectScientific and Technological Innovation Project - Qingdao National Laboratory for Marine Science and Technology[2016ASKJ12] ; National Natural Science Foundation of China[41730534] ; National Natural Science Foundation of China[41776001] ; National Natural Science Foundation of China[41706018] ; National Program on Global Change and Air-Sea Interaction[GASI-IPOVAI-01-01] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11010204] ; AoShan Talents Program - Qingdao National Laboratory for Marine Science and Technology[2015ASTP] ; National Basic Research Program of China[2012CB417401]
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000447761300046
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/156131
Collection海洋环流与波动重点实验室
Corresponding AuthorTang, Xiaohui
Affiliation1.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.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Lyu, Yilong,Li, Yuanlong,Tang, Xiaohui,et al. Contrasting Intraseasonal Variations of the Equatorial Pacific Ocean Between the 1997-1998 and 2015-2016 El Nino Events[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(18):9748-9756.
APA Lyu, Yilong,Li, Yuanlong,Tang, Xiaohui,Wang, Fan,&Wang, Jianing.(2018).Contrasting Intraseasonal Variations of the Equatorial Pacific Ocean Between the 1997-1998 and 2015-2016 El Nino Events.GEOPHYSICAL RESEARCH LETTERS,45(18),9748-9756.
MLA Lyu, Yilong,et al."Contrasting Intraseasonal Variations of the Equatorial Pacific Ocean Between the 1997-1998 and 2015-2016 El Nino Events".GEOPHYSICAL RESEARCH LETTERS 45.18(2018):9748-9756.
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